Assertion Reason Test: Animal Kingdom
19 Questions MCQ Test Additional Study Material for NEET | Assertion Reason Test: Animal Kingdom
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A: Cysticercosis is caused by accidental ingestion of onchospheres.
R: Taenia solium is a monogenetic parasite.
A: Mantle of pearl oyster is three-layered.
R: Nacre secreting cells are present just below the nacreous layer.
Reason is also true, i.e. Nacre secreting cells are present just below the nacreous layer.
But reason is not the correct explanation for assertion.
A: Annelids, arthropods and molluscs are protostomial coelomates.
R: All three phyla include members with bilateral symmetry and true coelom.
Reason is also true, i.e. all three phyla include members with bilateral symmetry and true coelom.
But the reason is not the correct explanation for assertion.
A: In Balanoglossus, the proboscis is involved in excretion.
R: Glomerulus is present is probosis.
Balanoglossus belong to phylum hemichordate where proboscis gland performs an excretory function.
Reason is also true, i.e. Glomerulus is present in proboscis responsible for or mediating the excretory function of proboscis gland. Both Assertion and reason are correct, and reason is the correct explanation for assertion.
A: Echinoderms are the only radially symmetrical animals with true coelom.
R: Echinoderms have secondarily adapted to radial symmetry.
Reason is also true as echinoderms have secondarily adapted to radial symmetry because larval forms of echinoderm are bilaterally symmetric, but adults are radially symmetric.
Both assertion and reason are correct, but reason is not the correct explanation for assertion.
A: Hydra has a nerve net, but no brain.
R: All its neurons are apolar and connected.
Reason is also true as neurons in Hydra are apolar. These apolar neurons (with no axon terminals) can join to form nerve net. Hence both Assertion and Reason are correct, and Reason is the correct explanation for Assertion.
A: Radula is rasping organ of all molluscs.
R: It is made up of vitrodentine.
Radula is absent in class pelecypoda (Bivalvia) of molluscs.
Reason is also false as radula bears chitinous teeth.
Both assertion and reason are false.
A: True coelom originated for the first time in phylum Annelida.
R: It allowed the animal to have an alimentary canal longer than the body & space for storing gametes.
Reason is true, and Annelids have longer alimentary canal than body and space for storing gametes.
Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
A: Chitinous exoskeleton is a characteristic feature of arthropods.
R: It allows diffusion of water vapour from the atmosphere to the body.
Reason is false as chitin is impermeable to water and does not allow water vapour diffusion from atmosphere to body or vice-versa.
Assertion is true, but Reason is false.
A: In metatherians, scrotum is present in front of penis.
R: In prototherians, scrotum is present behind the penis.
Reason is false as in sub-class Prototheria of class Mammalia, testis is abdominal and remains inside abdominal cavity.
A: Birds have metanephric kidney and no urinary bladder.
R: South American Ostrich has urinary bladder.
Reason is correct as the south American ostrich (Rhea Americana) is a flightless bird with urinary bladder (Exception).
Both Assertion and Reason are true, but reason is not the correct explanation for assertion.
A: All birds, except Koel (cuckoo), build nests for retiring and taking rest during night time.
R: Koel lays eggs in the nests of tailorbird.
Reason is false as Koel exhibit Brood Parasitism, as Koel lays egg in crow nest.
A: The duck-billed platypus and the spiny ant-eater are egg-laying animals yet are grouped under mammals.
R: Both of them have seven cervical vertebrae and mammary glands without teats.
Both Assertion and Reason are correct, and Reason is the correct explanation for Assertion.
A: Bats and whales are classified as mammals.
R: Bats and whales show echolocation and four chambered heart.
Reason is correct as bats and whales show echolocation and possess four chambered heart.
Both Assertion and Reason are correct, but Reason is not a correct explanation for Assertion.
A: Piscean scales are similar to reptilian scales in origin.
R: Age of the animal can be deduced by lines of growth on both the scales.
Reason is true as animals' age can be deduced by lines of growth on both the scales.
A: Dicondylic skull is found in amphibians and mammals.
R: The number of cranial nerves in amphibians and mammals is same.
Reason is false as amphibian possess 10 pairs of cranial nerves and mammals to possess 12 pairs of cranial nerves.
A: Evolution of shelled eggs helped the reptiles to successfully adapt for terrestrial life.
R: The origin of shelled eggs occurred earlier than viviparity.
Reason is wrong as viviparity is exhibited by mammals, some reptiles, and some lower animals even before shelled egged animals first evolved.
A: All chordates have kidneys as excretory organs.
R: Kidneys help in the removal of metabolic wastes along with regulating the osmolarity of body fluids.
A: The lungs of birds are provided with air sacs.
R: Air sacs supplement respiration.
Reason is also true as air sacs make ventilation in birds highly efficient. Air sacs ensure air flow over the gas exchange surface in only one direction and do not allow mixing of air. Thus air sacs supplement respiration in birds.
Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
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26 videos|287 docs|64 tests
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26 videos|287 docs|64 tests
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