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CBSE Questions for Class 9 Biology Diversity In Living Organisms Quiz 15 - MCQExams.com
CBSE
Class 9 Biology
Diversity In Living Organisms
Quiz 15
Leech,
Nereis
,
Scolopendra
, prawn and scorpion all have segmented body organization, but still, they cannot be classified in one group. Which of the following is the correct basis for the classification of these organisms into different groups?
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Leech and
Nereis
belong to the phylum Annelida because they have metamerically segmented body.
0%
Scolopendra
, prawn and scorpion belong to the phylum Arthropoda, as they possess jointed appendages.
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Leech,
Nereis
and
Scolopendra
belong to the phylum Annelida because they possess closed blood vascular system.
0%
Both A and B.
Explanation
Leech and
Nereis
belong to phylum Annelida because they have a metamerically segmented body, i.e., the body is divided into many segments internally by septa.
Scolopendra
, prawn, and scorpion belong to phylum Arthropoda because the body segment of these animals usually bears paired lateral and jointed legs or appendages.
Flame cells are
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Excretory cells
0%
Digestive cells
0%
Respiratory cells
0%
All of the above
Explanation
A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms (Platyhelminthes), rotifers and nemerteans. they have a tuft of cilia which continuously beats to clear the nitrogenous waste which gives an appearance of burning flame.
So, the correct answer is option A.
A scout bee, finding a new food source, communicates its location to other bees and
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Cannot communicate the direction of the food source
0%
Can communicate the direction of the food source by round dance
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Can communicate the direction of the food source by tail-wagging dance
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Can communicate the direction of the food source by rapid dance
Explanation
A scout bee, finding a new food source, communicates its location to other bees and can communicate the direction of the food source by tail-wagging dance. When scout bees find a new potential home, they do a waggle dance to broadcast to other scout bees where the nest is and how suitable it is for the swarm. The nest with the most support, in the end, becomes the new home.
But new research in this field shows another layer of complexity to the decision-making process: The bees deliver "stop signals" via head butts to scouts favoring a different site. With enough head butts, a scout bee will stop its dance, decreasing the apparent support for that particular nest.
This process of excitation (waggle dances) and inhibition (head butts) in the bee swarm parallels how a complex brain makes decisions using neurons.
Which one of the following is not a characteristic of
Annelida
?
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Metanephridia
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Segmentation
0%
Pseudocoelom
0%
Clitellum
Explanation
Annelids are coelomate animals which means that they possess a true coelom.
The
pseudocoelom
is a fluid-filled body cavity lying inside the external body wall of the nematode.
They have long thin bodies composed of a series of identical segments. These segments lie between the head, comprised of a prostomium, a mouth and sometimes a peristomium, and a tail called a pygidium. A clitellum is part of the reproductive system of an annelid. The clitellum is a thick, saddle-like, ring found in the epidermis (skin) of the worm. The nitrogenous waste products of metabolism diffuse from the body's cells into the fluid of the coelom. The coelomic fluid is slowly drained into small tubular organs, called metanephridia. As the fluid passes through the metanephridia it can exchange some materials with the network of blood vessels that are intertwined around the tubule.
Which one of the following is wrong about
Chara
?
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Upper oogonium and lower round antheridium
0%
Globule and nucule present on the same plant
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Upper antheridium and lower oogonium
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Globule is male reproductive structure
Explanation
Chara
is a multicellular green alga. Sexual reproduction in
Chara
is oogamous.
The male sex organ is a spherical structure which is yellow in color
and is called antheridium or globule.
The female sex organ is oval shaped green colored
structure and is called oogonium or nucule.
Most species of
Chara
are monoecious i.e. globule and nucule are present on the same plant.
Globule and nucule are present at the nodes with globule present below the nucule i.e. oogonium are
present at upper portion and antheridium is present at
a lower
portion.
Hence, statement 'Upper antheridium and lower oogonium' is incorrect among all the given statements.
Green glands present in some crustaceans help in
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Respiration
0%
Digestion
0%
Excretion
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None of the above
Explanation
In crustaceans, a pair of excretory organs is present which is called as green glands. The green glands collect residuals from the blood and other parts of the body. They are connected by ducts to excretory pores, located under the base of the antennae and these pores release the excretions outside.
Well developed alimentary canal first developed in
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Protozoans
0%
Mammals
0%
Annelids
0%
Poriferans
Explanation
The first animals to possess the alimentary canal were probably nematodes. From these nematodes, the alimentary canal underwent a diversity of evolution, resulting in more well developed types of alimentary canals. The earthworm, of the phylum Annelida, is the first to develop well developed alimentary canal.
Examine the figure given below and select the right option giving all the four parts (a, b, c and d) correctly identified.
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(a) - Archegoniophore, (b) - Female thallus, (c) - Gemmacup, (d) - Rhizoids
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(a) - Archegoniophore, (b) - Female thallus, (c) - Bud, (d) - Foot
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(a) - Seta, (b) - Sporophyte, (c) - Protonema, (d) - Rhizoids
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(a) - Antheridiophore, (b) - Male thallus, (c) - Globule, (d) - Roots
Explanation
A.Correct option -A
B.Explanation for correct option -A
●Female gametangiophore is known an archegoniophore ,it grows up from the thallus and consists of a stalk and an archegonial head with hanging lobes /fingers.
●Gametophyte plant body is called a thallus, which lacks xylem and phloem and so,it does not have true stem, true leaf and true root.
●Gemma cups are cup-like structures containing gemmae type structure .
●Gemmae are small discs of haploid tissue directly give rise to new gametophytes.
● Dispersed from gemma cups by rainfall.
●Rhizoid are simple hair-like protuberances extend from the lower epidermal cells .
● Rhizoid absorb water by capillary action in which water moves up between threads of rhizoid.
According to scientists, aves have evolved from
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Amphibians
0%
Reptiles
0%
Pisces
0%
Mammals
Explanation
According to scientists, aves have evolved from reptiles. The evolution of birds is thought to have begun in the Jurassic Period, with the earliest birds derived from a clade of theropoda dinosaurs named as Paraves. Birds are categorized as a biological class, Aves. The earliest known is
Archaeopteryx lithographica
, from the Late Jurassic period, though
Archaeopteryx
is not commonly considered to have been a true bird. Modern phylogenies place birds in the dinosaur clade, Theropoda. According to the current consensus, Aves and a sister group, the order Crocodilia, together are the sole living members of an unranked reptile clade, the Archosauria.
Study the following features
1- Triploblastic animal
2- Body can be divided into two similar halves by only one plane passing through the longitudinal axis of the body
3- No body cavity present between epidermis and gastrodermis
4- Digestive system is branched and incomplete without anus
Identify the animal on the basis of the above-given features.
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0%
0%
0%
Explanation
Fasciola hepatica is also known as the common liver fluke. It is a platyhelminth.
Characteristics of Platyhelminthes:-
1) free-living and parasitic unsegmented worms that are dorsoventrally flattened (depressed)
2) triploblastic, acoelomate, bilaterally symmetrical
3) spiral cleavage
4) complex gut, but still incomplete; gut reduced to absent in parasitic species 5) cephalization
6) organ/organ system level of organization
7) protonephridia as excretory/osmoregulatory structures
8) hermaphroditic; complex reproductive system.
Select the option which has the complete set of fresh-water fishes.
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Rohu, Calbasu, Sardine, Eel
0%
Sanghara, Hilsa, Salmon, Pomphrets
0%
Mrigal, Catla, Malhi, Rohu
0%
Mackerels, Tuna, Bombay duck, Flatfish
Explanation
On the basis of habitat fishes are classified into 3 categories, freshwater fish, marine fish and brackish water fish.
Mrigal, calbasu, catla and rohu are the carp fish. Mrigal, catla, malhi and rohu are the freshwater edible fish.
They are native to the Asian river.
Whereas tuna, salmon, bombay duck, pomphrets, eel, sardine and flatfish are the marine fish and hilsa is the brackish water fish.
Thus, the correct answer is option C.
Read the following characteristics of an organism.
(i) Soft, dorsoventrally flattened, leaf-like body.
(ii) Head lone bears mouth surrounded by oral sucker.
(iii) Presence of excretory system and sense organ.
(iv) considerable osmotic adaptability.
Base on the above characteristics, identify the animal and select the correct option.
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Taemia solium
0%
Fasciola hepatica
0%
Wuchereia nancrofit
0%
Leusososlenia
Explanation
Fasciola hepatica is a common liver fluke or sheep liver fluke. It is a parasitic trematode ( fluke or flatworm, a type of helminth) of the class Trematoda, phylum Platyhelminthes that infects the livers of various mammals, including humans.
It possesses the following characteristics:
(i) Soft, dorsoventrally flattened, leaf-like body.
(ii) Head lone bears mouth surrounded by the oral sucker.
(iii) The presence of an excretory system with specialized flame cells and sense organ.
(iv) They have considerable osmotic adaptability.
So, the correct answer is option B.
Read the given statements.
(a) .............. are collectively called .............. as all of these are seedless plants and have inconspicuous reproductive organs.
(b) .............. are collectively called ................... as they are seeded plants and possess conspicuous reproductive organs.
(c) The scientific nomenclature of organisms used today was developed by ............ and consists of ................ and species name.
(d) Class Aves consists of ................. animals while class Reptilia consists of ................ animals.
Select the option which correctly fills the blanks in any two of the above statements.
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(a)Algae, Bryophytes, and pteridophytes; Cryptogams, (b) Gymnosperms and angiosperms; Phanerogams
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(c) Bentham; Genus, (d) Warm blooded; cold blooded
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(b) Gymnosperms and angiosperms; Cryptogams, (c) Carolus Linnaeus; Class
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(a) Algae, bryophytes and pteridophytes; Cryptogams, (d) Warm blooded; Cold blooded
Explanation
Algae, bryophytes and pteridophytes are collectively called cryptogams as all of these are seedless plants and have inconspicuous reproductive organs. Class aves consists of warm blooded animals while class reptilia consist of cold blooded animals. Gymnosperms and angiosperms are collectively called phanerogams as they are seeded plants. In gymnosperms, the males make fairly inconspicuous reproductive structures. The scientific nomenclature of organisms used today was developed by Carolus Linnaeus and consists of genus and species name.
In Five-kingdom classification, the kingdom that includes the blue-green algae, nitrogen bacteria and methanogenic bacteria is
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Monera
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Protista
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Plantae
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Fungi
Which of the following statements are incorrect about thallophyta?
(i) Sex organs are unjacketed and one-celled gametangia.
(ii) The vascular system is well developed.
(iii) An embryo stage is absent.
(iv) The plant body is differentiated into root, stem, and leaves.
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(i) and (iii)
0%
(i) and (iv)
0%
(ii) and (iii)
0%
(ii) and (iv)
Explanation
Thallophyta: salient features are- most primitive and simple plants. They do not possess a vascular system. The plant body is not differentiated into stem roots and leaves. The whole plant body remains in the form of an undivided mass of cells called thallus. The mode of nutrition is photosynthetic, parasitic or saprophytic. They reproduce both sexually and asexually. Asexual reproduction usually reproduction takes place by spore formation. Fertilization is not followed by embryo formation. The division Thallophyta includes two major classes, algae and lichens.
Algae and other submerged green plants often float in water during daytime and sink at night because
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They lose weight at night because fish and other animals eat away at their parts.
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They become buoyant due to accumulation of oxygen as a result of photosynthesis.
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They become light due to consumption of food.
0%
They come up to enjoy sunlight.
Explanation
During the process of photosynthesis, phytoplankton produces oxygen as a byproduct. Due to their vast and widespread populations, algae and cyanobacteria are responsible for approximately half of all the oxygen found in the ocean and in our atmosphere. During day time they float, due to the accumulation of oxygen. Whereas the reverse happens during the night, which is explained below.
In addition to providing food and oxygen for nearly all life on Earth, phytoplankton help to regulate inorganic carbon (carbon dioxide) in the atmosphere. During photosynthesis, carbon dioxide and water molecules are used to make sugar for energy. The process of incorporating inorganic carbon into organic carbon (glucose and other biologically useful compounds) is called carbon fixation and is part of the biological carbon pump.
As carbon fixation and oxygen production are part of the same process, the extent of phytoplanktons participation is on the same scale. Phytoplankton consumes a similar amount of carbon dioxide as all land plants combined. While phytoplankton can pull carbon dioxide from the atmosphere or the ocean, it will have a similar effect. Carbon dioxide that is taken from the water is replaced by carbon dioxide from the atmosphere.
The basal cell of
Ulothrix
is devoid of
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Chloroplast
0%
Pyrenoid
0%
Nucleus
0%
None of these
Explanation
The plant body consists of unbranched, uniseriate filaments. The cells of the filaments are arranged end to end. They are barrel-shaped or cylindrical in shape. The apical cell is somewhat rounded at its terminal end whereas, the basal cell is elongated and does not have chlorophyll. It is also called as the basal holdfast, which attaches the filament to the substratum. Hence the correct option is A.
In bees, dance is meant for
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Reproduction
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Visiting the source of food
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Communication
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Killing foreign beings
Explanation
Waggle dance, which is bee dance is a term used in beekeeping and ethology for a particular figure-eight dance of the honey bee. By performing this dance, the bees can communicate with other members of the colony. This communication involves the information about the direction and distance to patches of flowers yielding nectar and pollen, water sources, new nest-site locations. A waggle dance with a very short waggle run is used to be characterized as a distinct (round) recruitment dance.
Thus, it is a method of dance for communicating, mainly about the nearby food source.
The similarity between Giraffe, Rabbit, Camel, Bat, and Whale is that all of them have
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Nucleated RBCs
0%
Four chambered stomach
0%
Seven cervical vertebrae
0%
Enucleated WBCs
Explanation
The key characteristic features of all the mammals are the mammary gland, skin with hairs, seven cervical vertebrae, 12 pairs of cranial nerves and muscular diaphragm. As giraffe, camel, bat and whale are the mammal and thus possess seven cervical vertebrae. Four chambered heart is present in all the mammals, birds and some reptiles like a crocodile. Enuceated RBC is the characteristic feature of all the mammal except camel. WBCs are always nucleated. Thus, the correct answer is option C.
What type of bird has a very thin pointed beak?
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Honey sucking
0%
Pollen eating
0%
Carnivore
0%
Seed eater
Explanation
All the bird species have a beak adapted to acquiring, handling, and consuming their particular foods. Numerous types of beaks are seen, but the majority of birds may be classified as having one of six main styles:
Hooked Beaks,
Cracker Beaks,
Tweezer Beaks,
Strainer Beaks,
Probing Beaks,
Spear Beaks.
Thin pointed beaks are referred to as Tweezers. These kinds of beaks are particularly adapted by carnivorous birds. Hence, option C is correct.
Bladderworm is a stage in the life history of
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Liverfluke
0%
Planarian
0%
Roundworm
0%
Tapeworm
Explanation
The tapeworm stage (
Taenia hydatigena
) occurs in the small intestine of the dog, with the tapeworm itself being up to three meters long. The adults produce eggs that pass out in tapeworm segments in the dog's feces. If these are on pasture, they can be eaten by sheep in which larvae develop and migrate from the gut into the liver or onto the surface of various organs where large cysts, up to 60 mm long, can form.
The cycle continues when dogs eat sheep carcasses that contain viable cysts that develop into tapeworms in the dog's small intestine.
So, the correct answer is option D.
Which of the following traits is not characteristic of amphibians?
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Usually requires water for reproduction
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Amniote egg
0%
Skin used as supplementary respiratory organ
0%
Thin, scaleless skin
Explanation
Amphibian larvae are often aquatic and go through a complex metamorphosis process as they grow to adulthood. They have moist skin and do not have scales, feathers or hair. The life cycle of amphibians reflects their evolutionary history of bridging land and water. Most amphibians lay their eggs in freshwater. A few species tolerate brackish water and some species lay their eggs on land. Extraordinarily, some species even carry their eggs inside their body. These eggs are not amniotic in nature.
What is the zoological name of the Indian peacock, the national bird?
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Passer domesticus
0%
Pavo cristatus
0%
Psittacula eupatria
0%
Columba livia
Explanation
The zoological name of the Indian peafowl or blue peafowl is
Pavo cristatus.
It is a large and brightly coloured bird. The species was first named and described by Linnaeus in 1758, and the name
Pavo cristatus
is still in use now.
The house sparrow
(Passer domesticus)
is a bird of the sparrow family Passeridae, found in most parts of the world. A small bird, it has a typical length of 16 cm and a weight of 2439.5 g.
The Alexandrine parakeet (
Psittacula eupatria
) or Alexandrian parrot is a member of the psittaciformes order and of the Psittaculidae family.
The rock dove (
Columba livia
) or rock pigeon is a member of the bird family Columbidae (doves and pigeons). In common usage, this bird is often simply referred to as the "pigeon".
Character common in Spider, Cockroach and Centipede is
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Compound eyes
0%
Book lungs
0%
Green glands
0%
Jointed legs
Explanation
A character common in the spider, cockroach, and centipede is jointed legs as all these belong to phylum Arthropoda.
Arthropod eyes are called compound eyes because they are made up of repeating units, the ommatidia, each of which functions as a separate visual receptor. Spiders do not have compound eyes, whereas cockroach has compound eyes like centipedes.
A book lung is a type of respiration organ used for atmospheric gas exchange that is found in many arachnids, such as scorpions and spiders.
Green glands- one of the pair of excretory organs in each side of the head region of decapod crustaceans, emptying at the base of the antennae.
The most important advancement of mammal over reptile is
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The erythrocytes have become enucleated
0%
Presence of thick fur of hairs preventing the heat loss of the body
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Presence of placenta, vascular connection between mother and foetus
0%
Presence of diaphragm separating thoracic and abdominal cavities
Explanation
Reptiles are cold-blooded, relying on external heat sources to raise their body temperature to a point necessary for activity. They are oviparous. Whereas mammals are warm-blooded, generating their heat internally, retaining it by insulation of fur and/or fat. Having a more consistent body temperature means a more continuous activity level, which means more fuel (food) is required to supply the energy necessary for this active lifestyle.
They possess the mammary gland, placenta during an embryonic developmental stage. They develop the young one inside the body and nourish their child through a vascular connection between mother and foetus.
Thus, the correct answer is option C.
Common about silk, lac and honey is that these are
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Secretions of plants
0%
Products of insects
0%
Products of wingless insects
0%
Products of social insects
Explanation
Silk is a natural protein fibre. As we know, some forms of the silk can be woven into textiles. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm,
Bombyx mori
reared in captivity (sericulture).
Lac is the scarlet resinous secretion of a number of species of lac insects, of which the most commonly cultivated species is
Kerria lacca
.
Honey is a sweet food made by bees using nectar from flowers.
Hence, all of them are the products of insects. Thus, the correct answer is the option B.
The worker honey bee normally lives for about
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30 days
0%
90 days
0%
10 days
0%
15 days
Explanation
The worker honeybee normally lives for about 30 days. A worker bee is any female (eusocial) bee that lacks the full reproductive capacity of the colony's queen bee; under most circumstances, this is correlated to an increase in certain non-reproductive activities relative to a queen, as well. Worker bees also occur in many bee species other than honey bees.
How many hearts are present in the blood vascular system of
Pheretima posthuma
?
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6 pairs
0%
2 pairs
0%
1 pairs
0%
4 pairs
Explanation
4 pairs of the heart are present in the earthworm. The blood vascular system is a closed type. Blood contains haemoglobin dissolved in plasma. There are many types of corpuscles which are colourless and nucleated. There are two longitudinal blood vessels, the dorsal and the ventral running on the dorsal and ventral sides of the gut.
Another longitudinal vessel, the subneural vessel, runs longitudinally below the nerve cord and splits into two, the two branches running on the lateral side of the stomach, oesophagus and pharynx.
The dorsal and ventral vessels are connected to each other in segments 7, 9, 12 and 13 by means of paired pulsatile hearts. The hearts in 12$$^{th}$$ and 13$$^{th}$$ segments are called as lateral oesophageal hearts while the anterior pairs in the 7
$$^{th}$$
and 9
$$^{th}$$
segments are called as lateral hearts.
There are also two pairs of non-pulsatile loops in segments 10 and 11, which connect the supra-oesophageal vessel to the lateral oesophageal vessels.
Therefore, the correct answer is option D.
Clitellum of
Pheretima
is primarily concerned with
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Copulation
0%
Production of cocoons
0%
Excretion
0%
Burrowing
Explanation
Clitellum of
Pheretima
is primarily concerned with the production of cocoons. The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited. It is present about 2 cm (0.79 in) behind the anterior end of the body (around the 14
$$^{th}$$
, 15
$$^{th}$$
and 16
$$^{th}$$
segments).
How can male and female
Ascaris
be identified?
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Posterior end of male is straight, while that of female is curved.
0%
Anterior end of female is curved, while that of male is straight.
0%
Posterior end of male is curved, while that of female is straight.
0%
Anterior end of male is curved, while that of female is straight.
Explanation
Ascaris are the unisexual and shows sexual dimorphism. The male worm measure 12-23 cms in length and 3-4 mm in diameter. The tail (posterior end) is curved ventrally in the form of a hook, with a conical tip. Whereas the female worm is longer and stouter than males measuring 25-49cms in length and 5mm in diameter. The tail ( posterior end ) is straight and blunt. Thus, the correct answer is option C.
Which of the following stages in the life history of liver fluke infects the primary host?
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Metacercariae
0%
Miracidium
0%
Cercaria
0%
Redia
Explanation
Platyhelminthes contain worms that cause parasitic and non-parasitic infections in humans and other mammals. Liver fluke is an endoparasite.
The fluke completes its life cycle with the help of two hosts. The primary host is sheep and its secondary or intermediary host is the freshwater snail.
Liver fluke infects the snail at the miracidium stage and sheep at the metacercaria stage. Hence, option A is correct.
Annelids are abundant and successful organisms characterised accurately by all of the following except
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A hydrostatic skeleton
0%
Segmentation
0%
A cuticle made of chitin
0%
Closed circulatory system
Explanation
The hydrostatic skeleton is a characteristic structure present in the soft-bodied animals like some echinoderms, cnidarians and annelids like the earthworm. It plays an important role in the locomotion.
Body segmentation is another characteristic of the annelids. Most of an annelid's body consists of a series of segments which are practically identical.
An exoskeleton made up of chitin is a characteristic feature of the organisms belonging to Arthropoda. It is not present in the annelids.
Most of the annelids possess a closed type of circulatory system in which the blood flows through vessels.
Thus, the correct answer is the option C.
Lateral line system found in fishes has been lost in amphibia because of_________
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Occurrence of metamorphosis in amphibia
0%
Evolution of terrestrial habit
0%
Change over to herbivorous feeding
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Development of sturdy legs
Chloragogen cells are found in
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Blood of earthworm
0%
Blood of cockroach
0%
Coelomic fluid of earthworm
0%
Body wall of
Leucosolenia
Explanation
Chloragogen cells are cells in annelids that function similarly to the liver in vertebrates. The cells store glycogen and neutralize toxins, are yellowish in color due to the presence of yellow granules called chlorogosomes and are present in the coelomic fluid of some annelids.
These cells are derived from the inner coelomic epithelium and help in excretory functions, as most commonly demonstrated in earthworms. They have characteristic vesicular bulging which store and transport substances like glycogen and nitrogenous wastes.
They take part in the deamination of amino acids and the synthesis of urea.
Silicates taken in along with food are deposited in the chloragogen cells.
So, the correct answer is option C.
All of the following correctly characterise nematodes except that
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They play an important role in decomposition.
0%
They are often parasitic.
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They have a pseudocoelom.
0%
They have both circular and longitudinal muscles.
Explanation
Nematodes are parasitic, triploblastic, bilaterally symmetrical, pseudocoelomate. But nematodes do not possess circular muscle so are unable to elongate the body. This results in the highly characteristic serpentine pattern of locomotion. They play an important role in decomposition. Thus, the correct answer is option D.
Earthworm belongs to the class of
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Archiannelida
0%
Polychaeta
0%
Oligochaeta
0%
Nematoda
Explanation
Oligochaeta is a class of animals in the biological phylum Annelida. It includes many types of aquatic and terrestrial worms and including all of the various earthworms. Specifically, the oligochaetes contain the terrestrial megadrile earthworms (some of which are semiaquatic or fully aquatic), and freshwater or semi-terrestrial microdrile forms, including the tubificids, pot worms and ice worms (
Enchytraeidae
), blackworms (
Lumbriculidae
) and several interstitial marine worms.
Which of the following statements is true for
Pheretima
?
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It is a dioecious animal with distinct sexual dimorphism.
0%
In it, copulation occurs at night in burrow during rainy season.
0%
It can copulate throughout the year whenever it rains.
0%
It cannot travel both backwards and forwards.
Explanation
Mating occurs usually when the ground is wet following rain. Earthworms may emerge and travel over the surface of the ground before they mate, but most often they merely protrude the anterior end and mate with a worm in an adjacent burrow.
The two worms join the lower surfaces of their anterior ends, with heads pointing in opposite directions. Mucous is secreted until each worm is enclosed in a tube of slime. When the sperm is released, it is carried backward in longitudinal grooves that are converted into tubes by the mucous sheath to the sperm receptacles of the mating partner.
The worms then separate and egg-laying and fertilization occur later.
A skeleton like function during locomotion of
Pheretima posthuma
is performed by
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Blood
0%
Alimentary canal laden with mud
0%
Coelomic fluid
0%
Ventral nerve cord
Explanation
A skeleton-like function during locomotion of
Pheretima posthuma
is performed by the movement of the coelomic fluid. The coelomic fluid acts as a skeleton which allows the earthworm to move forward and backward. The locomotion is brought about by an increase in the hydrostatic pressure of the anterior ten segments.
There is the contraction of the circular muscles which begins at the anterior end and the wave passes backward. This causes the anterior region to extend forward. The anterior end grips and setae act as anchors on the soil.
Then, the circular muscles relax and longitudinal muscles of the anterior segments contract in a wave beginning from the anterior end, which shortens the anterior end and causes the posterior part of the body to pull forward.
These movements of contraction and relaxation results in the locomotory movement. The coelomic fluid serves as a hydraulic skeleton and setae cause the body to anchor firmly in the soil.
Thus, the correct answer is option C.
The upper eyelid of frog is
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0%
Thick
0%
Thin
0%
Absent
0%
None of these
Explanation
Frogs have a regular set of eyelids which helps them to keep their eyes moist and clean. They have a bottom lid that stays still and an upper lid that blinks. Frogs also possess a third eyelid that serves a different purpose. This one is called as the nictitating membrane. It is a semi-transparent lid that covers the eye completely, helping the frog see underwater and hide from predators.
Which of the following is a true fish in which male gives birth to its young ones?
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0%
Sea horse
0%
Sea hare
0%
Sea mouse
0%
Sea cow
Explanation
Sea hares are marine gastropod Molluscs which possess soft internal shell made up of protein.
Sea mouse is a marine polychaete worm found in the North Atlantic.
The sea cow is an extinct marine mammal.
Seahorse is the name given to 54 species of small marine fishes in the genus $$Hippocampus$$
.
The seahorse is a true fish, with a dorsal fin located on the lower body and pectoral fins located on the head near their gills. Male seahorses possess the remarkable ability to give birth to thousands of babies at once.
Presence of earthworms at a certain place is easily indicated by
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0%
Conical holes
0%
Heaps of small rounded pellets of soil
0%
Spiral coils of cast skin
0%
Holes in the ground
Explanation
The presence of earthworms at a certain place is easily indicated by heaps of small rounded pellets of soil. It is because earthworms are natural mud tillers or ploughers. These organisms help in loosening of the soil, as their locomotion, as well as digestion, involves soil. And so they are known as farmer's friend.
Which one of the following is commonly known as pork tapeworm of man?
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0%
Taenia marginata
0%
Taenia solium
0%
Taenia saginata
0%
Taenia flavipunctatus
Explanation
Platyhelminthes is a triploblastic, bilaterally symmetrical acoelomate and the space between the
body
wall and the
alimentary
canal is filled with mesenchyme (connective tissue)
. The developing nerve net clearly indicates that they have an organ grade of organization.
Taenia solium
is an intestinal infection with adult tapeworms that follows ingestion of contaminated pork. Cysticercosis is infection with larvae of
T. solium
, which develops after ingestion of ova excreted in human feces.
So, the correct answer is option B.
Where are the fertilised eggs stored in the mature proglottid of
Taenia
?
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0%
Uterus
0%
Embryo sac
0%
Vagina
0%
Oviduct
Explanation
Platyhelminthes is a triploblastic, bilaterally symmetrical acoelomate and the space between the
body
wall and the
alimentary
canal is filled with mesenchyme (connective tissue)
. The developing nerve net clearly indicates that they have an organ grade of organization.
Taenia solium
is an intestinal infection with adult tapeworms that follows the ingestion of contaminated pork.
A single gravid proglottid can contain more than 50,000 embryonated eggs. The free eggs and detached proglottids are released into the environment through peristalsis.
Eggs can survive in the environment for up to two months. Fertilized eggs are stored in the uterus.
So, the correct answer is option A.
Heart pumps only impure blood in:
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0%
Sharks
0%
Whale
0%
Lizard
0%
Frog
Explanation
The heart pumps only impure blood in sharks. Sharks have a two-chambered heart which is an S-shaped tube. It has an atrium and ventricle. The blood is pumped by the heart through the afferent branchial arteries to capillaries in the gills, where the blood is oxygenated).
The blood then flows through efferent branchial arteries, through the tissues of the body, and back to the heart in veins. Sharks have low blood pressures; the walls of the pericardium are rigid, creating suction within the pericardium to maintain the flow of blood. To circulate blood throughout their bodies, many sharks must swim continuously.
The blood flow is similar to humans because blood is pumped by the heart to the rest of the body by arteries and returned to the heart by veins.
A difference is that humans have 4-chambered hearts while sharks only have two chambers.
All the limbs of a tetrapod are nearly equal in size and similar in shape with a membraneous skin between the fingers. What would be the chief method of movement?
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0%
Gliding
0%
Jumping
0%
Crawling
0%
Flying
Explanation
Tetrapods include the first four-limbed vertebrates and their descendants, including the living and extinct amphibians, reptiles, mammals, birds and fish. The gliding movement will be seen in tetrapods which have limbs nearly equal in size and similar in shape with a membranous skin between the fingers. For example, birds.
Which of the following has powerful suckers?
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0%
Taenia solium
0%
Trichinella spiralis
0%
Fasciola hepatica
0%
Ascaris
Explanation
Platyhelminthes is a triploblastic, bilaterally symmetrical acoelomate and the space between the
body
wall and the
alimentary
canal is filled with mesenchyme (connective tissue)
. The developing nerve net clearly indicates that they have an organ grade of organization.
It has a distinct head, the scolex, contains suckers and a rostellum as organs of attachment.
Sucker acts as an adhesion device in parasitic worms, cephalopods, and certain fishes and bats. It is a muscular structure for suction on the host or substrate. In parasitic worms such as annelids, flatworms, and roundworms, suckers are the organs of attachment to the host tissues.
So, the correct answer is option A.
Which one of following is a viviparous snake?
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0%
Cobra
0%
Krait
0%
Viper
0%
Rat snake
Explanation
The viper is easy to identify as the head is relatively small and is short, wide, pear-shaped and distinct from the neck and is covered with cephalic scales with serrated keels.
Vivipary means development of the embryo inside the body of the mother, eventually leading to live birth, as opposed to laying eggs
Most vipers and all of the rattlesnakes fall into this category. Members of the Boidae family, which includes boa constrictors and anacondas, also give birth to live young.
So, the correct answer is option C.
Which one of the following is out of place?
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0%
Coral snake
0%
Glass snake
0%
Sea snake
0%
Rattle snake
Explanation
Coral snakes are a large group of elapid snakes seen on land.
The glass lizards or glass snakes are a genus,
Ophisaurus
, of reptiles that resemble snakes, but are actually lizards. Although, most species have no legs, their head shapes, movable eyelids, and external ear openings identify them as lizards.
Rattlesnakes are a group of venomous snakes of the genera
Crotalus
. They are predators that live in a wide array of habitats, hunting small animals such as birds and rodents.
The sea snakes, are a subfamily of venomous elapid snakes that inhabit marine environments for most or all of their lives. They differ from others in their habitat.
Therefore, the correct answer is option C.
Which of the following animal belongs to order
Chelonia
of class
Reptilia
?
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0%
Chelone
0%
Trionyx
0%
Testudo
0%
All of the above
Explanation
The order
Chelonii
, containing all turtles.
Trionyx
is a genus of softshell turtles belonging to the family
Trionychidae
.
Testudo
is a genus of tortoises found in North Africa, western Asia, and Europe. Several species are under threat in the wild, mainly from habitat destruction. All the options are examples of order
Chelonia
So, the correct answer is '
All of the above'
Ophisaurus is a___________________
Report Question
0%
Blind snake
0%
Glass snake
0%
Sea snake
0%
Tree snake
Explanation
Ophisaurus is also known as glass lizards or glass snakes. They feed on the insect. reptiles and spiders. They are reptiles that resemble snakes but are actually lizards. A few species have very small, stub-like legs near their rear vents. These are vestigial organs, meaning they have evolved and are no longer in use. These animals are also known as jointed snakes.
So, the correct answer is option B.
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Practice Class 9 Biology Quiz Questions and Answers
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