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CBSE Questions for Class 9 Biology Diversity In Living Organisms Quiz 16 - MCQExams.com
CBSE
Class 9 Biology
Diversity In Living Organisms
Quiz 16
Which of the following are exclusively marine?
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Terrapins
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Tortoises
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Terrapins and turtles
0%
Turtles
Explanation
Turtle is a reptile with a body encased in a bony shell, including tortoises. Although, numerous animals, from invertebrates to mammals, have evolved shells, none has an architecture like that of turtles. They are exclusively marine in nature.
The diamondback terrapin is believed to be the only turtle in the world that lives exclusively in brackish water (containing some salt, but not as much as ocean water), habitats like tidal marshes, estuaries, and lagoons. Most terrapins hibernate during the winter by burrowing into the mud of marshes.
A tortoise habitat is usually a dry region of lands such as a grassland, savannah, or desert, since they are largely land-based animals, unlike turtles, their close cousins, that have webbed front feet and prefer aquatic homes. Tortoises are spread all over the globe, with some marine species existing entirely within the confines of the ocean, so a tortoise habitat can vary a great deal depending on the particular species of animal.
So, the correct answer is option D.
Which of the following has no teeth in its mouth?
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Tortoise
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Crocodile
0%
Hemidactylus
0%
Draco
Explanation
Tortoise doesn't have teeth, their mouths have tough and pointy edges that function pretty effectively for their biting purposes. These mouth edges operate similarly to the bills of birds. River terrapins possess mouth "extras" that the bulk of turtles, including tortoises, don't have. Their top jaws feature tough, bony plates that assist them in grinding their food down, whether mollusks or vegetation. These plates are called as secondary palates.
So, the correct answer is option A.
Which of the following animal is poikilothermic?
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Chelone
0%
Ostrich
0%
Hippopotamus
0%
Parrot
Explanation
A poikilotherm is an organism whose internal temperature varies considerably. It is the opposite of a homeotherm, an organism which maintains thermal homeostasis. Chelone is a kind of turtle which is poikilothermic.
Poikilothermic animals include types of vertebrate animals, specifically fish, amphibians, and reptiles, as well as a large number of invertebrate animals. The naked mole-rat is the only mammal that is currently thought to be poikilothermic.
So, the correct answer is option A.
Which one of the following is poisonous?
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Naja naja
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Rat snake
0%
Python
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Double mouth snake
Explanation
Naja naja
is the most common species which causes snake bite. The poisonous venom majorly attacks the central nervous system which stops the sensation by blocking the impulse transmission of the nervous system. The Indian cobra's venom mainly contains a powerful post-synaptic neurotoxin and cardiotoxin. The venom acts on the synaptic gaps of the nerves, thereby paralyzing muscles, and in severe bites leading to respiratory failure or cardiac arrest.
So, the correct answer is option A.
Venom of cobra effects on
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Respiratory system
0%
Nervous system
0%
Excretory system
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Digestive system
Explanation
The venom of the cobra attacks the nervous system and they stop the transmission of the impulse. The neurotoxins released is known as the haditoxin. It causes severe pain, blurred vision, vertigo, drowsiness, and eventually paralysis. If the envenomation is serious, it progresses to cardiovascular collapse, and the victim falls into a coma. Death soon follows due to respiratory failure.
So, the correct answer is option B.
If an 'axolotl larva' is placed in water containing sufficient iodine then
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Its skin pigmentation will change.
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It will start metamorphosis.
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It remains as usual without any change.
0%
Larva will die soon.
Explanation
The axolotl is also known as a Mexican salamander. Axolotls are unusual among amphibians in that they reach adulthood without undergoing metamorphosis. Instead of developing lungs and taking to land, the adults remain aquatic and gilled.
When sufficient amount of iodine is provided, it has profound effects on thyroid gland and results in metamorphosis. Metamorphosis yields a mature axolotl from its larval form.
Mandarin fish have____________________
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Single chambered heart
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Two chambered heart
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Three chambered heart
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Four chambered heart
Explanation
In
Pisces
, the heart is two-chambered, unlike the four-chambered heart in mammals. They lay eggs. For example,
mandarin fish along with angler fish, lionfish, torpedo, stingray, dogfish, rohu, sea horse, Anabas, hilsa, mullet, etc.
The best characteristic feature of fish is
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Dermal scales
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Epidermal scales
0%
Lateral line system
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Both A and C
Explanation
The lateral line is a system of sense organs found in aquatic vertebrates, mainly fish. It is the modified epithelial cells, called as hair cell. It is used to detect movement and vibration in the surrounding water.
In pigeon, which of the following glands secretes the milk in both sexes?
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Liver
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Gizzard glands
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Crop glands
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Salivary glands
Explanation
a crop gland can be defined as an expanded, muscular pouch near the gullet or throat in the birds. It is a part of the digestive tract, essentially an enlarged part of the oesophagus. The crop is used to temporarily store food. Not all birds have a crop. In adult doves and pigeons, the crop can produce crop milk to feed newly hatched birds.
Both female and male pigeons produce a nutrient rich substance in their crop to feed their young (squabs). This substance has been likened to lactation in mammals and is referred to as pigeon ‘milk’. This ‘milk’ is essential for the growth and development of the pigeon squab and without it, they fail to thrive.
Longest gestation period is that of
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Human being
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Camel
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Rhino
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Salamandra atra
Explanation
The gestation period can be defined as the time in which the foetus develops, which is counted from the fertilization and ends at the birth. The average gestation period of human beings is around 280 days or 40 weeks. Camels have a gestation period of 13-14 months or around 410 days. Rhinos have the average gestation period of around 450 days.
Salamandra atra
is a shiny black salamander which has the longest gestation period (among the given options) which is around two to four years
So, the correct answer is '
Salamandra atra'
Birds are 'glorified reptiles' statement given by_______________
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Darwin
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Huxley
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Lamarck
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Mendel
Explanation
Birds are 'glorified reptiles' statements given by Huxley as they have characteristics of reptiles along with certain extra modifications.
Though the reason does not fully justify the statement Huxley has told that the million years ago the primitive reptiles like pseudosuchians has started a bipedal movement like birds after that during the same time the Pterosaurs have developed power of flight. 150 million years ago, the primitive bird
Archaeopteryx
has formed the land bridge between the Reptiles and birds.
Therefore, the correct answer is option B.
The largest fish is
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Cetorhinus
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Carcharhinus
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Carcharodon
0%
Rhincodon
Explanation
The whale shark (
Rhincodon typus
) is the largest fish in the world, with its vast size i.e.,
12.2 meters length and weigh as much as 40 tons by some estimates. The largest reported whale shark was 20 meters, but it is uncommon to see them longer than 12 meters.
Mammal that lay egg_____________
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Kangaroo
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Platypus
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Crow
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Cat
Explanation
The subclass Prototheria contains the most primitive mammals that lay eggs. After hatching, the young ones are transferred to a pouch on the abdomen and are nourished by milk e.g.,
Ornithorhynchus
or platypus.
The study of fishes is known as
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Ornithology
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Saurology
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Ichthyology
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Herpetology
Explanation
Ichthyology is also known as fish science, is the branch of Class 9 Biology that deals with the study of fishes.
Ornithology is a branch of zoology that concerns the study of birds.
Saurology is the study of lizards.
Herpetology is the branch of zoology concerned with the study of amphibians Thus, the correct answer is option
C.
Tissue in platyhelminthes between viscera and body wall is called as
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Coelom
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Parenchyma
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Mesoderm
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Choanoderm
Explanation
Platyhelminthes don't have a body cavity and are called as acoelomates and the space between body organ is filled with loose parenchyma.
The platyhelminths are acoelomate and most of the body is made up of parenchyma. It helps in secretion, food and waste storage and regeneration.
So, the correct answer is option B.
A pigeon with no down feathers will not be able to______________
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Fly for long distance
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Protect against ectoparasites
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Exhibit secondary sexual dimorphism
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Keep the body warm
Explanation
The down feathers of birds is a layer of fine feathers which are found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds. Down is a fine thermal insulator and padding, used in goods such as jackets, bedding (duvets), pillows and sleeping bags. The loose structure of down feathers traps air, which helps to insulate the bird against heat loss.
Thus, if down feathers are absent pigeon will not be able to keep the body warm.
Therefore, the correct answer is option D.
An animal which has notochord throughout its life is
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Fish
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Bird
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Snake
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Amphioxus
Largest amphibian is a/an
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Necturus
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Ichthyophis
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Cryptobranchus
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Amphiuma
Explanation
Cryptobranchids are to be derived from hynobiid-like amphibians.
There are only 3 living species of giant salamander in the family Cryptobranchidae: the
hellbender
and the Chinese and Japanese giant salamanders.
Cryptobranchids are the largest amphibians in the world.
The excretory organs of prawn are
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Malpighian tubules
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Nephridia
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Kidneys
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Green glands
Explanation
Different kinds of excretory system in prawn are as follows:
(a) A pair of antennary or green glands-
the pair of excretory organs in each side of the head region of decapod crustaceans, emptying at the base of the antennae.
(b) A renal or nephroperitonial sac: large, thin-walled sac lying above the cardiac stomach
(c) The integument: It is an important excretory organ as the nitrogenous wastes present in the integument are removed during the moulting of the chitinous integument.
Therefore, the correct answer is option D.
Ascaris lumbricoides
is a common roundworm seen in
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Large intestine
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Small intestine
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Liver
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Stomach
Explanation
Ascaris lumbricoides
is a common roundworm seen in the small intestine where they live develops and molt. It causes ascariasis.
A true terrestrial animal is
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Frog
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Toad
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Tortoise
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None of the above
Explanation
The popular notion of a toad is a terrestrial animal similar to a frog with a drier, warty skin. Toads have shorter hind legs than do other frogs have.
These features help them to serve as a better terrestrial animal.
Which among the following does not have placoid scales?
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Rays
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Silver fish
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Skates
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Sharks
Explanation
All the cartilaginous fishes like rays, skates and sharks have placoid scales.
Placoid scales are
tooth-like, being made of dentine with a pointed backward projection of enamel,
all of which sits on top of a rectangular basal plate that rests on the dermis. Whereas silver fish is a wingless insect which do not possess scales on the dermis.
Therefore, the correct answer is option B.
The largest lizard is
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Varanus
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Heloderma
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Ophisaurus
0%
Chamaeleon
Explanation
Monitor lizard belongs to the genus
Varanus
. It is the largest known lizards.
These are characterized by long necks, powerful tails and claws, and well-developed limbs. The adult length of extant species ranges from 20 cm (7.9 in) in some species, to over 3 m (10 ft) in the case of the Komodo dragon, though the extinct varanid known as megalomania (
Varanus priscus
) may have been capable of reaching lengths of as much as 7 m (23 ft).
So, the correct answer is option A.
In reptiles, the teeth are absent in
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Lizards
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Snakes
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Chelonia
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Crocodiles
Explanation
A reptile is an air-breathing, cold-blooded, egg-laying vertebrate with an outer covering of scales or plates and a bony skeleton; it is a member of the class Reptilia.
Tortoises and turtles belong to genus
Chelones
have sharp, horny edges to their jaws, but no teeth. The teeth of other reptiles are usually sharp and pointed.
So, the correct answer is option C.
A poisonous lizard is
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Varanus
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Phrynosoma
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Heloderma
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Ophisaurus
Explanation
Correct Option:
C
Explanation:
The only
toxic lizard
in the world is the
Heloderma
, conjointly referred to as the
Gila monster
and venomous lizard.
It's found in massive numbers close to the Gila River in the southwestern United States.
Heloderma may be a genus of
toxicoferid lizards
that contains 5 species, all of which are venomous. It's the sole living genus of the reptile family.
Hence,
Heloderma
is the poisonous lizard from the following.
In which group of animals, body cavity is filled with blood?
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Nematoda
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Arthropoda
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Amphibians
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one of the above
Explanation
In Arthropods, the body cavity is filled with blood. This is called as haemocoel.
Haemocoel :The body cavity present in the arthropods and molluscs, which is filled with blood. The haemocoel is an enlarged blastocoel, which greatly reduces the coelom (this is restricted to the cavities of the gonads and excretory organs). The haemocoel can act as a hydrostatic skeleton.
A nephridium of an earthworm removes waste materials directly from the
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Gut
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Coelom
0%
Lymph
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Blood
Explanation
Nephridium occurs in pairs in the invertebrates. It performs the same function as that of the kidneys in the vertebrates and removes the metabolic wastes from the animal's body. Earthworms have metanephridia which are made up of a ciliated funnel that opens into the body cavity or coelom and is connected to a duct which may be glandular, folded or expanded opening into the organisms exterior. The metabolic wastes are therefore removed directly from the coelom.
Which of the following organisms neither have notochord nor vertebral column in their adult stage?
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Cephalochordate
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Herdmania
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Petromyzon
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Bdellostoma
Explanation
Herdmania belongs to the genus of the
ascidian. It
is devoid of the notochord and vertebral column in their adult stage. Herdmania is an exclusively marine and found in shallow nature. It is a solitary and sedentary attached to a rocky sea bottom or imbedded in a sandy flour. It is a oscillatory feeder, macrophages animals. The water current bringing food and oxygen enters the body through the branchial aperture. It is hermaphrodite and fertilization is external and development is indirect.
So, the correct answer is option B.
Round worms belongs to phylum
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Aschelminthes
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Platyhelminthes
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Echinodermata
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Chordata
Explanation
Round worms are unisexual animals and they belong to phylum Nematoda or Aschelminthes. It is bilaterally symmetrical, triploblastic pseudocoelomate.
Which of the following characteristics is specific to ctenophora but absent in porifera?
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No digestive system
0%
Acoelomate
0%
Gastrovascular cavity
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None of the above
Explanation
Sponges are animals of the phylum Porifera. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them. Sponges do not have nervous, digestive or circulatory systems and depend on constant water flow for respiration, nutrition and excretion.
A cockroach has .......... pairs of legs.
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2
0%
3
0%
4
0%
6
Explanation
Cockroaches are brown or black insects that are usually between half an inch and two inches long (12-50 millimeters), minus their long antennae. Their heads point downward, almost as if they're built for ramming. Males usually have wings, but females often don't. Those that do usually have vestigial wings - small, undeveloped wings that often don't allow the roach to fly. They have three pairs of jointed legs, one pair of antennae and a rigid exoskeleton. Roaches shed their exoskeleton, or molt, several times during their lives. After molting, most roaches are white and easily injured until a hormone called bursicon causes the exoskeleton to darken and harden. Sometimes, a roach can re-grow a lost limb when it molts and even put off molting to allow the new limb to grow.
Therefore, the correct answer is option B.
Which one is tadpole shrimp (tadpole fish)
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Lepus
0%
Squilla
0%
Balanus
0%
Triops
Explanation
D.
Triops
EXPLANATION:
Triops
is commonly called tadpole shrimp or tadpole fish. It is found in fresh water ponds and pools.
Triops
is characterized by an elongated, segmented body.
Peripatus is a connecting link between
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Coelenterata and Porifera
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Ctenophora and Platyhelminthes
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Mollusca and Echinodermata
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Annelida and Arthropoda
Explanation
Peripatus
is a connecting link between annelid and arthropod.
Peripatus
is an invertebrate, said to be a living fossil because the living members appear similar to fossil species as much as 570 million years old, and because the group is transitional between the Arthropoda (including crustaceans and insects) and primitive Ecdysozoa such as tardigrades, priapulids and nematodes.
Peripatus
is a nocturnal carnivore.
Its arthropods characters are claws, jaws, haemocoel, tracheae and dorsal tubular heart. The annelidan characters are continuous muscle layers in the body wall, unjoined legs and nephridia.
The mode of nutrition in Platyhelminthes is:
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Autotrophic
0%
Heterotrophic
0%
Parasitic
0%
All of the above
Explanation
Phylum Platyhelminthes includes unsegmented, triploblastic, acoelomate, bilaterally symmetrical and dorsoventrally flattened flatworms.
Flatworms can be free-living or parasitic. Free-living worms have a heterotrophic mode of nutrition. Parasitic worms depend on the host for food which is again a type of heterotrophic nutrition.
Thus, the correct answer is option B.
The respiratory organs present in spiders and scorpions are
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Book lungs
0%
Ctenidia
0%
Gills
0%
Lungs
Explanation
Book lungs are the main respiratory organs found within the small openings in the abdomen of the arachnid (spider and scorpion). It consists hemolymph-filled plate-like structures. Between the plates, there is an air space and this allows air to circulate around the plates. The gaseous exchange then occurs through the surface of the plates.
Both snail and tortoise have soft bodies covered in a hard shell. Yet, snail is grouped under Mollusca and tortoise under Reptilia. Why?
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Snail is small and tortoise is big
0%
Snail has no vertebral column while tortoise has one
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Snail has vertebral column
0%
Snail has limbs
Explanation
The major difference between vertebrates and invertebrates is the presence and absence of the vertebral column, respectively. Phylum Vertebrata includes the classes Cyclostomata, Pisces, Amphibia, Reptilia, Aves and Mammalia. Invertebrates include the phylums Nematoda, Annelida, Mollusca, Echinodermata, etc. Though a snail has a hard shell over its body, it does not have a vertebral column. On the other hand, the tortoise has a hard shell and it also shows the presence of a vertebral column and possesses all the other characteristic features of the class Reptilia. Hence, Tortoise is classified under Reptilia while snail is classified under Mollusca.
So, the correct option is 'B'.
Animals which have cylindrical body with many segments belong to
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Annelida
0%
Porifera
0%
Arthropoda
0%
Platyhelminthes
Explanation
Annelids have tube-in-a-tube body plan. They have a segmented body. The identical segments each contain circular and longitudinal muscles. The outside of the worm is covered with small stiff bristles called as setae. Setae are made of chitin, and each of them is equipped with a tiny retractor muscle. Setae function to anchor the worm in its burrow, and also to help it crawl along.
Therefore, the correct answer is option A.
The body of acorn worms can be divided as
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Anterior proboscis
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Intermediate collar
0%
Posterior trunk
0%
All of the above
Explanation
Acorn worms is a hemichordate. They are closely related to echinoderms. They are solitary worm-shaped organisms. They can be traced in burrows and are deposit feeders, but some species are pharyngeal filter feeders.
The body of acorn worms is worm-shaped and divided into an anterior proboscis, an intermediate collar, and a posterior trunk. The proboscis is a muscular and ciliated organ used in locomotion and in the collection and transport of food particles. The mouth is located between the proboscis and the collar. The trunk is the longest part of the animal.
So, the correct answer is option D.
............. is an example of Annelida.
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Ascaris
0%
Filarial worm
0%
Earthworm
0%
All of above
Explanation
Earthworm is a burrowing worm, its body is triploblastic segmented and shows bilateral symmetry. So, it is an example of phylum Annelida.
Ascaris
and Filarial worms are examples of phylum Nemathelminthes.
In Periplaneta, ductus ejaculatorius of male reproductive system lies in
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7th segment
0%
8th segment
0%
5th segment
0%
6th segment
Explanation
The ejaculatory duct is a muscular tube that extends posteriorly and opens at the gonopore or the male genital pore. Both the vas deferentia run backward and open into the ductus ejaculatorius in the seventh segment.
Which of the following character is not related to Indian chain viper?
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Subcandals are present in two rows
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An arrow mark (t) is present on the head
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Head is triangular covered by small scales
0%
Large black rings occur in three rows on the dorsal surface of the body
Explanation
$$\textbf{Correct Option B}$$
$$\textbf{Solution}$$
Indian chain Viper snake which belongs to Viperidae family. They are the native reptiles of Indian subcontinent they are one of the most venomous snake.
$$\bullet$$ $$\textbf{Option A}$$
They are terrestrial snake. They have subcandals which are present in two rows and their body is covered with keeled scales.
$$\bullet$$ $$\textbf{Option B}$$
There is no presence of arrow mark on the head. This on the head is actually a characteristic feature of Indian Viper which is also known as pitless viper and in India it is known as phoorsa.
$$\bullet$$ $$\textbf{Option C}$$
The Indian chain viper have a head which is triangular in shape and it is covered with small scales.
$$\bullet$$ $$\textbf{Option D}$$
There are black rings which are present on the dorsal surface of the body in three consecutive rows on the Indian chain Viper snake.
So, the correct option is B.
Match the following and choose the correct combination.
List-I
List-II
Arenicola
I. Terrestrial leech
Hirundinaria
II. Marine leech
Pontobdella
III. Lug worm
Haemadipsa
IV. Fresh water leech
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1- I, 2- II, 3- III, 4- IV
0%
1- III, 2- IV, 3- II, 4- I
0%
1- II, 2- III, 3- IV, 4- I
0%
1- I, 2- III, 3- IV, 4- II
Explanation
Arenicola is the large marine worm belongs to class annelida and comprises of lugworms and black worms.
Hirundinaria granulosa is a fresh water leech found in ponds, streams and rivers. It is a free living or parasitic form on the cattle.
Pontobdella is a marine leech that are present in tropical and subtropical regions and are well known as jawed leeches.
Many acorn worms are known to produce
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0%
Proteins
0%
Casein
0%
Phenol
0%
Ethanol
Explanation
Acorn worms is a hemichordate. They are closely related to echinoderms. They are solitary worm-shaped organisms. They can be traced in burrows and are deposit feeders, but some species are pharyngeal filter feeders. Many are well known for their production and accumulation of various halogenated phenols and pyrroles.
So, the correct answer is option C.
Formicarium is the nest of which of the following animals?
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Termites
0%
Ants
0%
Wasps
0%
Honey bees
Explanation
B. Ants
EXPLANATION: A formicarium is the nest of ants. Myrmecologists are those who study about ant behavior. Only the queen ant can lay eggs. Male ants mate with the female ants and then the female ants lay the eggs within a special chamber in side the nest.
Proteus anguinus is an example for
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Circannual rhythms
0%
Effect of light on pigmentation
0%
Phototaxis
0%
Photokinesis
Explanation
The
Proteus anguinus or the cave salamander is a rare amphibian with an unusual appearance,
shaped
by several million years of living in dark caves in central Europe. It's skin lacks pigment, giving its body a white, pasty
appearance
.
I
t also has a pink hue due to blood capillaries near the skin, and as its translucency shows the contours of the internal organs.
So, it is considered to be a good example to study the effects of light on pigmentation.
Thus, the correct answer is option (B).
Identify the correct combinations.
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Housefly, Labellum, Pseudotrachea
0%
Moth, Labellum, Dutton's membrane
0%
Butterfly, Maxillae, Gelea
0%
Tsetsefly, Rostrum, Haustellum
Explanation
Labellum are sponge-like organs of the mouth parts, (equivalent to lips) which are present in the housefly. It is a complex strucutre consisting of many grooves, called pseudotrachea, which sops up liquids much like a sponge does.
Dutton membrane are the membrane that connects the labellae.
These are present in the mouth of female mosquito.
Maxillae are the upper jawbone formed from the fusion of two maxillary bones.
Galea is the part which covers the upper part of the cranium in humans and various other animals.
Haustellum is a proboscis in insect which is adapted to suck blood.
Rostrum is a beak-like projection of head in an insect, crustacean or cetacean. It is although absent in tsetse fly.
Thus, the correct answer is option (A),
In Periplaneta, which one of the following helps to nourish the sperms?
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Ejaculatory duct
0%
Vas deferens
0%
Utriculi majors
0%
Utriculi brevores
Explanation
A mushroom shaped gland is present in the sixth and seventh abdominal segments in Periplaneta. It functions as an accessory reproductive gland. This gland consists of two types of tubules.
They are
a long slender tubules, the utriculi majors or peripheral tubules. Their secretions forms the inner layer of the spermatophore.
Short tubules, the utriculi brevores. Their secretions nourishes the sperms.
Which one of the following does not have larvae in its life cycle?
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Prawn
0%
Earthworm
0%
Crab
0%
Cockroach
Explanation
A larva is a distinct juvenile form many animals undergo before metamorphosis into adults.
Earthworm belongs to phylum Annelida and it does not have larvae in its life cycle.
The earthworm mates and fertilizes the egg which is held in the protective cocoon. It hatches from the cocoon and burrows in the soil where it grows into a juvenile worm and finally into a mature worm. Hence, option B is correct.
An opening serving both as mouth and anus is found in
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0%
Coelenterates and porifers
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Coelenterates and aschelminthes
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Coelenterates and annelids
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Coelenterates and platyhelminthes
Explanation
Option-(D) Coelenterates and platyhelminthes.
Animals such as those who only have one opening or exit to their gastrointestinal system it becomes rather difficult to say which is most closest. Coelenterates, Platyhelminthes have an opening serving both as mouth and anus.
A dorsal horn is present on the ........... of the mulberry silk worm (caterpillar).
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Head
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$${ 8 }^{ th }$$ abdominal segment
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$${ 5 }^{ th }$$ abdominal segment
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$${ n }^{ nd }$$ thoraic segment
Explanation
The abdomen of the mulberry silk worm has 10 segments with five pairs of unjointed, pseudolegs. One pair each in segment 3rd, 4th, 5th, 6th and 10th, a short dorsal anal horn on the 8th segment and a series of spiracles on lateral sides.
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Practice Class 9 Biology Quiz Questions and Answers
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