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CBSE Questions for Class 11 Medical Biology Animal Kingdom Quiz 12 - MCQExams.com
CBSE
Class 11 Medical Biology
Animal Kingdom
Quiz 12
Which is correct set belonging to single group ?
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Bat, Pigeon, Cow
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Man, Monkey, Chimpanzee
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Oyster, Octopus, Otter
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Cuttlefish, Jellyfish, Silver fish
Explanation
Bat is a mammal whereas Pigeon and Crow are birds.
Cuttlefish is a mollusc, Jellyfish is a cnidarian, whereas Silverfish is an insect.
Octopus and oyster are molluscs, Otter is a mammal.
Man, Monkey and Chimpanzee are mammals and belong to the Taxon Primates.
So the correct answer is 'Man, Monkey, Chimpanzee'.
Pouch is seen in
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$$\textit{Platypus}$$
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Bat
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$$\textit{Lemur}$$
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Marsupial
Explanation
Marsupials are known as pouched mammals which give birth to poorly developed live young. Their young are carried in pouches present on the bodies of the adult females (in most cases) till they are well developed.
$$\textit{Platypus}$$ is an egg laying mammal. Bats and $$\textit{Lemur}$$ are eutharians and give rise to well developed young.
So, the correct answer is 'Marsupial'.
Which among the following has an opposable thumb?
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Platypus
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Kangaroo
0%
Mole
0%
Lemur
Explanation
The opposable thumb is a characteristic feature of Primates. This helps them hold objects and establish strong grips.
Only Lemurs are Primates hence have an opposable thumb.
Kangaroo, Mole and Platypus are not primates hence do not possess opposable thumbs.
So the correct answer is 'Lemur'.
Pick up the odd one out.
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Chelone, Calotes, Naja
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Pavo, Psittacula, Ornithorhyncus
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Canis, Felis, Rattus
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Bufo, Rana, Hyla
Explanation
Chelone, Calotes, Naja are all reptiles.
Canis, Felis and Rattus are all mammals.
Bufo, Rana, and Hyla are all amphibians.
Pavo and Psittacula are birds, whereas Ornithorhynchus is a mammal.
So the correct answer is 'Pavo, Psittacula, Ornithorhynchus'.
Consider the names of the following pests.
a. Army worm of cotton
b. Colorado potato beetle
c. Cabbage lopper
d. Diamond-back moth of cabbage
Which of these are the target pests of Bacillus thuringiensis?
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$$1, 2, 3$$ and $$4$$
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$$2, 3$$ and $$4$$
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$$1$$ and $$2$$
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$$1, 2$$ and $$4$$
Separated cells of two vertebrates are mixed up. They will
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Aggregate species-wise
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Aggregate tissue-wise
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Aggregate species-wise and then tissue-wise
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Aggregate species-wise and then reconstruct the animals.
Explanation
B. Aggregate tissue-wise
EXPLANATION: The process of aggregation permits re-establishments of the cells, which are present inside the tissues. In aggregate culture, cell function and survival are often enhanced. If separated cells of two vertebrates are mixed up, the cells aggregate tissue-wise.
Which of the following is mainly used in the movement of snakes?
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Vertebrates
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Ribs
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Limbs
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Both A and B
Explanation
The whole skeleton is made of 2 ribs protruding out from each vertebrae except at the tail and the skull.
Snakes do not have any limbs.
So the ribs and the vertebrae help in movement of the snakes.
So the correct answer is 'Both A and B'.
The characteristics of class Reptilia are _______________________.
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Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears
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Body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca
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Fresh water animals with bony endoskeleton, air-bladder to regulate buoyancy
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Marine animals with cartilaginous endoskeleton, body covered with placoid scales
Explanation
Organisms under the class Reptilia are identified as cold-blooded organisms and their body is covered by dry and cornified scales. They have three-chambered heart, except crocodiles, and they breathe through the lungs. These animals do not possess external ears, instead, they have tympanum.
Hence, option A is the correct answer.
Which of the following vertebrate have dermal scales instead of epidermal scales:
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Pisces
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Amphibians
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Birds
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Mammals
Explanation
Dermal scales are found almost exclusively in fishes and some reptiles. They are bony plates that fit closely together or overlap and form the dermal skeleton.
Thus, the correct answer is option A.
A mammal, which does not have pinna is:
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Platypus
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Whale
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Seal
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All of the above
Explanation
Pinna is the outer or external part of ear that receives soundwaves and transfers them to the auditory canal. Pinna is present in mammals with some exceptions. Egg laying mammal Platypus lacks pinna and due to this, its sense of hearing is not strong. The ears of Platypus have a small opening towards the outside from which sound waves enter.
So, the correct answer is 'Platypus'.
Which one of the following pairs of animals is similar to each other concerning the feature stated against them?
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Bat
and Platypus - Viviparity
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Garden lizard and crocodile - Three chambered heart
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Small intestinal roundworms and
hookworms - Segmentation
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Sea horses and gold fish - Cold-blooded
Explanation
1. Bat is viviparious while platypus is oviparious.
2. Garden lizard has a three chambered heart while crocodile has a four chambered heart.
3. Small intestinal roundworms and hookworms belongs to
Aschelminthes and show no segmentation.
4. Sea horses and goldfish belong to Pisces and are c
old-blooded.
So, the correct option is D.
Which of the following characteristics is not shared by birds and mammals?
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Warm-blooded nature
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Ossified endoskeleton
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Breathing using lungs
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Viviparity
Explanation
Answer:
(D) Viviparity.
Explanation:
Birds and mammals both have the
ability to maintain their
constant body temperature,
this is known as
homeostasis
.
So, birds and mammals both are
warm-blooded
in nature.
The
endoskeleton
of both birds and mammals is
made up of bones
. So, both have
ossified endoskeletons.
Both birds and mammals use
lungs
as their
respiratory organs
and hence for
breathing
.
But,
birds are oviparous while mammals are viviparous
.
Hence,
viviparity
is not a common characteristic shared by both birds and mammals.
Snakes belongs to reptiles because
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It can crawl
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It is oviparous
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It has feather
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None of the above
Explanation
The class name Reptile refers to their creeping or crawling mode of locomotion (Latin, repere or reptum, to creep or crawl). Snakes are included in reptiles because of their other similarities like hard scales on skin and are poikilotherms.
So, the correct option is 'It can crawl'.
Which of the following fish is jawless?
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Sea horse
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Rohu
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Lamprey
0%
Octopus
Explanation
Sea horse and rohu are fishes that have jaws. Octopus is not a fish.
Cyclostomata is a group of eel-shaped vertebrate fishes including the lampreys. They are also known as jawless vertebrates. They are ectoparasites or borers of
other vertebrates.
So, the correct answer is option C.
Which of the following characteristics first developed in reptiles ?
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Amniotic eggs
0%
Scales on skin
0%
Four-legged body
0%
Skull and vertebral column
Explanation
Reptiles and birds are amniote animals, which means that the eggs laid by females contain an elastic sac within which the embryo develops. But, reptiles are primitive than birds; so they developed the characteristic of amniotic eggs first.
So, the correct answer is option A.
The example of uricotelic animals is?
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Fishes
0%
Reptiles
0%
Amphibians
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Mammals
The example of egg laying mammal is?
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Bat
0%
Kangaroo
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Pigeon
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Echidna
In the kingdom Animalia, which of the following is not an invertebrate?
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Platyhelminthes
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Echinodermata
0%
Arthropoda
0%
Amphibia
Explanation
Vertebrates are animals that have a backbone or vertebral column. These animals include Cyclostomata, Pisces, Amphibia, Reptilia, Aves and Mammalia.
Vertebrates are classified under the category of Vertebrata. Any organism classified outside Vertebrata is an invertebrate.
So, the correct option is 'D'.
Choose the correct answers from the alternatives given.
A four-chambered heart is characteristic of:
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bony fish
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mammals
0%
amphibians
0%
none of these
Explanation
Fishes and amphibians have two and three-chambered heart respectively and mammals have a four-chambered heart.
So, the correct option is, 'mammals'.
In which of the following notochord is replaced by bony vertebral column in adult?
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$$Ascidia$$
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$$Branchiostoma$$
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$$Petromyzon$$
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$$Labeo$$
Explanation
Presence of notochord is a characteristic feature of all chordates.
The members of sub-phylum Vertebrata possess notochord
during the embryonic stage.
In vertebrata adult form the notochord is replaced
by a cartilaginous or bony vertebral column.
While in members of other Sub-phyla of Chordata the notochord r
emain as such.
Hence, the correct answer here is option D as $$Labeo$$ belongs to vertebrata.
Choose the correct answer from the given
alternatives
.
Unlike placental mammals, both monotremes and marsupials:
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Lack nipples
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Have some embryonic development outside the mother's uterus
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Lay eggs
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Are found in Australia and Africa
Explanation
A
marsupial
is a mammal that raises its newborn offspring inside an external pouch at the front or underside of their bodies. Monotremes are are mammals that lay eggs outside the body of the female.
In contrast
, a
placental
is a mammal that completes embryo development inside the mother, nourished by an organ called the placenta.
So the correct answer is "
have some embryonic development outside the mother's uterus".
Choose the correct answers from the alternatives given.
External ears are characteristics of.
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cartilaginous fishes
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sea horse
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mammals
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newts
Explanation
The ear has external, middle, and inner portions. The outer ear is called the pinna and is made of ridged cartilage covered by skin. Sound funnels through the pinna into the external auditory canal, a short tube that ends at the eardrum. These are the characteristic of mammals.
So, the correct option is 'Mammals'.
Dicondylic skull with ten pairs of cranial nerves are present in __________.
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Pisces
0%
Amphibia
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Reptelia
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Mammalia
Choose the correct answers from the alternatives given.
Platypus is an exception to many mammals because it:
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Lacks hair
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Is cold-blooded
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Does not secrete milk
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Lays eggs
Explanation
All mammals give birth to young ones. But, the platypus is an exception to this characteristic. Although it is a mammal, but it lays eggs.
So, the correct option is D.
Choose the correct answers from the alternatives given.
Archaeopteryx is a connecting link between:
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reptiles and mammals
0%
reptiles and birds
0%
chimpanzee and apes
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chordates and non-chordates
Explanation
Archaeopteryx looks like a bird. It has wings like birds. However, its teeth and tail are like those of reptiles. Archaeopteryx is, therefore, considered as a connecting link between reptiles and birds, thereby suggesting that birds have evolved from reptiles. So, the correct option 'reptiles and birds'
In some chordates, the notochord is modified as the vertebral column. Such animals are called vertebrates. Which one of the following statement make sense?
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All chordates are vertebrates but all vertebrates are not chordates.
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All vertebrates are chordates and all chordates are vertebrates.
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All vertebrates are chordates but all chordates are not vertebrates.
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Chordates are not vertebrates and vertebrates are not chordates.
Explanation
All chordates have a notochord. Chordates include Urochordata, Cephalochordata (both are called Protochordata), and Vertebrata. In vertebrates, notochord is replaced by the vertebral column (backbone). However vertebral column is not present in protochordates. Therefore, all vertebrates are chordates but all chordates are not vertebrates.
Thus, the correct answer is option C.
Read the following statement and select the option having correct statements only.
(a) Presence of body hair and mammary gland is characteristic feature of all adult mammals.
(b) Duck-billed platypus is a connecting link between reptiles and mammals.
(c) Prehensile tail is a characteristic of both new world and old world monkey.
(d) There will be no change in the body temperature of Neophron and Macaca if the surrounding temperature changes.
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(b) & (d)
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(a) & (c)
0%
(b) only
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(a), (b), (c), & (d)
Explanation
A-
Two
characteristics
are used to define the
mammal
class. They are
mammary
glands
and
body
hair
(or fur). Female
mammals
have
mammary
glands
. The
glands
produce milk after the birth of offspring.
B-
Egg laying
mammalian
like “
Duck
bill
platipus” is the connective
link
between
reptiles
and
mammals
. They have both characters
reptilian
and
mammalian
. They lay egg like
reptiles
and have hairy skin and other characters like
mammals
.
C-
Many
New
World
monkeys
in the family Atelidae, which includes howler
monkeys
, spider
monkeys
and woolly
monkeys
,
have
grasping
tails
often with a bare tactile pad. This is in contrast with their distant
Old
World
monkey cousins who
do
not
have
prehensile
tails
.
So, the correct option is 'Option A'.
Which of the following exhibit biradial symmetry?
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Comb jellies
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Man
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Earthworm
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Sponges
Explanation
Comb jellies belongs to Ctenophora, and they are organisms that show biradial symmetry.
Biradial symmetry is basically a mixture of bilateral and radial symmetry.
In this type of symmetry, the body components are arranged with similar parts on either side of the central axis, and each of the four sides of the body is identical to the opposite side but it is different from the adjacent side.
So, the correct answer is option A- 'Ctenophora'.
Which of the following is not a character of phylum Hemichordata?
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Presence of stomochord which is mesodermal in origin
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Excretory organ is proboscis gland
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Circulatory system is open
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Respiration takes place through gills
Explanation
Phylum Hemichordata consists of a small group of worm-like marine animals with an organ-system level of organisation. The body is cylindrical and is composed of an anterior proboscis, a collar, and a long trunk. The circulatory system is of open type. Respiration takes place through gills. The excretory organ is proboscis gland.
So the correct option is "Presence of stomochord which is mesodermal in origin".
State whether the following statements are true or false:
Silverfish belongs to the class Pisces.
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True
0%
False
Explanation
Silverfish are insects and
they belong to Phylum Arthropoda.
They resemble fish with their movement in the water. Hence, are known by the name 'silverfish.'
So, the given statement is false.
Choose the correct answer from the alternatives given.
Which of the following is free-living bacteria responsible for nitrogen fixation?
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Pseudomonas
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Rhodospirillum
0%
Azotobacter
0%
All of these
Explanation
Non-
symbiotic
bacteria in the soil and
symbiotic
bacteria that live in the roots of plants are capable of nitrogen fixation. Bacteria in the
genera Clostridium
and
Azotobacter
are non-
symbiotic
nitrogen-fixing bacteria, while those in the genus
Rhizobium
are
symbiotic
bacteria. Pseudomonas species
fixes
nitrogen
under microaerobic conditions in the free-living state and colonizes rice endophytically.
Nitrogen fixation in phototrophic bacteria has been found in
Rhodospirillum rubrum.
So, the correct option is, 'All of these'.
The characters given below are shown by
(i) Extracellular and intracellular digestion
(ii) Exclusively marine, radially symmetrical, diploblastic, tissue revel of organisation
(iii) Bisexual, fertilisation external and indirect development
(iv) No asexual reproduction
(v) Presence of comb plates
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Cnidaria
0%
Porifera
0%
Ctenophora
0%
none of these
Explanation
The given characteristics are of 'Ctenophora'.
The characteristics given below are associated with:
(i) Dry and scaly skin
(ii) They do not have external ears.
(iii) Cold-blooded
(iv) Lay eggs
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Reptiles
0%
Birds
0%
Amphibians
0%
Mammals
Explanation
The skin of reptiles is scaly and dry. They are cold-blooded animals, i.e. not able to regulate the body temperature with respect to temperature changes in the environment. Reptiles lay eggs. They do not have external ears. Some of the examples of reptiles are crocodiles, tortoises, snakes, etc.
Hence, the correct option is 'A'.
Which of the following reptiles give birth to live young?
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Slowworms
0%
Pythons
0%
Sea snakes
0%
Both (a) & (c)
Explanation
Being a legless lizard, the slow worm (Anguis fragilis) is often mistaken for a snake. However, there are certain features that separate the slow worm from snakes, including the presence of eyelids and ear openings. The male and female differ in appearance; the female is usually brown, copper-coloured or red on the back, with brown or black sides, often with lighter iridescent. Depending on the local climate, the female slow worm will mate annually or once every two years. The slow worm is ovoviviparous, and instead of laying eggs, the female gives birth to an average of eight live young between mid-August and mid-September.
Sea snakes are air-breathing cold-blooded reptiles. Like all snakes they have forked tongues and body scales and they regularly shed their skins. They are found primarily in warm tropical waters of the Pacific. The area of highest species diversity is Indonesia and northwest Australia. Most sea snakes give birth after gestation periods that range from four to eleven months, depending on the species. Most species reproduce every year. The timing of the reproductive cycle varies between species and also differs between geographical locations for the same species. Young are born underwater and must be independent immediately to swim to the surface to breathe. There is no parental care.
So the correct option is 'both (a) and (c).
Which one of the following sets of animals belongs to a single taxonomic group?
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Cuttlefish, Jellyfish, Silverfish, Dogfish, Starfish
0%
Bat, Pigeon, Butterfly
0%
Monkey, Chimpanzee, Man
0%
Silkworm, Tapeworm, Earthworm
Which of the following is true about the Bats?
Bats are mammals.
Bats have wings which are actually the modified forelimbs.
Bats are nocturnal in habit.
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1 & 3
0%
2 & 3
0%
1, 2 & 3
0%
1 & 2
Explanation
Bats are mammals with their forelimbs adapted as wings, they are the only mammals naturally capable of true and sustained flight. Bats are more manoeuvrable than birds, flying with their very long spread-out digits covered with a thin membrane or patagium. Most bats are nocturnal, and many roost in caves or other refuges; it is uncertain whether bats have these behaviours to escape predators. Bats are present throughout the world, with the exception of extremely cold regions. They are important in their ecosystems for pollinating flowers and dispersing seeds; many tropical plants depend entirely on bats for these services.
So the correct option is '1, 2 and 3'.
Choose the incorrect statement from the following.
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In birds and mammals internal fertilisation takes place.
0%
Colostrum contains antibodies and nutrients.
0%
Polyspermy in mammals is prevented by the chemical changes in the egg surface.
0%
In the human female implantation occurs almost seven days after fertilisation.
Explanation
Polyspermy is the entry of several sperms into the egg during fertilisation although only one sperm nucleus actually fuses with the egg nucleus. It occurs in animals with yolky eggs (e.g., birds).
Given below are four matchings of an animal and its kind of respiratory organ.
A.
Silverfish
-
Trachea
B.
Scorpion
-
Book lung
C.
Sea squirt
-
Pharyngeal gill slits
D.
Dolphin
-
Skin
The correct matchings are -
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A and B
0%
B and C
0%
B and D
0%
C and D
Explanation
Silverfish and sea squirt have pharyngeal gill slits, Scorpion has Book lung, and Dolphin has lungs as respiratory organs.
So, the correct answer is (B).
Which among these is not a cold-blooded vertebrate?
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Torpedo
0%
Draco
0%
Hyla
0%
Struthio
Explanation
Those vertebrates that cannot regulate their body temperature are called cold-blooded while those who have mechanisms to regulate their body temperature according to their changing environment are called warm-blooded.
Cold-blooded vertebrate groups include fish, amphibians & reptiles. Warm-blooded vertebrate groups include birds & mammals.
Torpedo i
s a fish -
Cold-blooded
Draco
is a reptile
-
Cold-blooded
Hyla
is an amphibian
-
Cold-blooded
Struthio
is a bird
- Warm
-blooded
So, the correct answer is option B.
The shell of a turtle or tortoise is divided into an upper and a lower section. What is the lower section called?
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Plastron
0%
Scute
0%
Carapace
0%
Subshell
Explanation
The turtle shell is a highly complicated shield for the ventral and dorsal parts of turtles, tortoises and terrapins (all classified as "turtles" by zoologists), completely enclosing all the vital organs of the turtle and in some cases even the head. It is constructed of modified bony elements such as the ribs, parts of the pelvis and other bones found in most reptiles. The bone of the shell consists of both skeletal and dermal bone, showing that the complete enclosure of the shell probably evolved by including dermal armor into the rib cage. The plastron is the nearly flat part of the shell structure of a turtle, what one would call the belly or ventral surface of the shell. It also includes within its structure the anterior and posterior bridge struts and the bridge of the shell. The plastron is made up of nine bones and the two epiplastra at the anterior border of the plastron are homologous to the clavicles of other tetrapods. The rest of the plastral bones are homologous to the abdominal ribs of other tetrapods.
So the correct option is 'plastron'.
What is the basis of classification of vertebrata into sub groups?
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0%
Notochord
0%
Vertebral column
0%
Organs of respiration
0%
Organs of reproduction
Explanation
Vertebrata is a class of organisms containing notochord and vertebral columns.
These organisms are divided into subgroups by modes of respiration. For example, fishes breathe through gills, amphibians through the skin, birds through air sacs, and mammals through the lungs.
Organs of reproduction are the same in all animals, though the mode of reproduction may vary.
So, the correct option is C.
This lizard living in deserts of Australia has a Curious ability to use rare rain water. The rain water does.not pass through the skin but flows in minute channels along It until it reaches the mouth where it is swallowed! Name this lizard.
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0%
Bearded lizard
0%
Moloch
0%
Rhinoceros iguana
0%
Teiid lizard
Explanation
The thorny devil (Moloch horridus) is an Australian lizard, also known as the mountain devil, the thorny lizard, or the moloch. This is the sole species of genus Moloch. The thorny dragon grows up to 20 cm (7.9 in) in length, and can live for 15 to 20 years. The females are larger than the males. Most of these lizards are coloured in camouflaging shades of desert browns and tans. These colours change from pale colours during warm weather and to darker colours during cold weather. These animals are covered entirely with conical spines that are mostly unclassified.
So the correct option is 'Moloch'.
Mammals are divided into several orders. Which order includes the most advanced mammals?
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0%
Primates
0%
Sirenia
0%
Pholidota
0%
Cetacea
Explanation
A primate is a mammalian animal constituting the taxonomic order Primates. They are the most advanced mammals. Primates arose 55-85 million years ago from terrestrial ancestors (Primatomorpha), who adapted to living in the trees of tropical forests: many primate characteristics represent adaptations to life in this challenging environment, including large brains, visual acuity, color vision, altered shoulder girdle, and dexterous hands. Primates range in size from Madame Berthe's mouse lemur, which weighs 30 g (1 oz), to the eastern gorilla, weighing over 200 kg (440 lb). There are 190 - 448 species of living primates, depending on which classification is utilized. New primate species continue to be discovered: over 25 species were described in the first decade of the 2000's, and eleven since 2010.
So the correct option is 'primates'.
In which of the following respects do mammals differ from reptiles?
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Structure of the teeth
0%
Arrangement of the legs
0%
Ability to breed on land
0%
Brighter colours
Explanation
Mammals can replace their teeth only with two sets, but reptiles can replace continuously. Mammals are heterodont, reptiles are homodonts. Some reptiles exhibit brighter colors, mammals do not.
So, the correct option is 'Structure of the teeth' and 'Brighter color'
Which of the following is present at the anterior end of Balanoglossus?
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Proboscis
0%
Collar
0%
Hepatic region
0%
Brachiocephalic region
Explanation
In longitudinal section of the anterior region of Balanoglossus, three parts are visible i.e., proboscis, collar, and trunk. Among these, the proboscis is present in the anterior end. It is almost round in shape. Proboscis helps in burrowing through the sand.
So, the correct answer is 'Proboscis'.
Heart is perfectly four chambered in:
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0%
Varanus
0%
Snake
0%
Garden lizard
0%
Crocodile
Explanation
Correct option: D
Explanation:
The heart is perfectly four-chambered only in avians, mammals and crocodiles.
Varanus
is a reptile with three-chambered heart.
Snakes are also reptiles, and have three-chambered heart.
Garden snake is also reptile with three-chambered heart.
But, Crocodiles being a reptile have four-chambered heart
.
Thus, Option D is correct.
Fish do not sink in water because of the presence of:
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0%
Swim bladder
0%
Air sacs
0%
Spongy bones
0%
Both A and B
Explanation
The swim bladder or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish to control their buoyancy, the fish is able to maintain its depth without floating upward or sinking.
Thus, the correct answer is 'A'.
Which statement is correct with respect to the heart in fishes?
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Only pure blood passes through it
0%
Only impure blood passes through it
0%
Both pure and impure blood can pass through it
0%
Blood does not enter the heart
Explanation
Fishes have the simplest type of true heart, a two-chambered organ composed of one atrium and one ventricle.
The impure blood enters the heart and is pumped to the gills for purification. From gills, the purified blood is sent directly to the body.
So, the correct answer is option B.
I. Body is covered by dry and cornified skin, epidermal scales.
II. They have no external ear
III. Crawling habit
IV. 3 chambered heart
The above characters are associated with:
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0%
Reptile
0%
Bird
0%
Amphibia
0%
Mammal
Explanation
Reptiles have dry skin that is cornified and shows the presence of epidermal scales that are shed off at regular intervals.
Reptiles have no external ears.
Some of the reptiles show crawling habits.
Most of them have a three-chambered heart with two atria and one ventricle.
Hence, the correct answer is A.
Notochord is absent in the group:
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0%
Hemichordata
0%
Chordata
0%
Cephalochordata
0%
Urochordata
Explanation
Hemichordates are marine invertebrates which are closely related to both chordates and echinoderms.
They are deuterostomes which have pharyngeal gill slits and most of them have a dorsal nerve cord and they lack a notochord.
So, the correct answer is '
Hemichordata'.
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Practice Class 11 Medical Biology Quiz Questions and Answers
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