Given below are two statements: 
Assertion (A): All birds, except the ones like koel (cuckoo), build nests for retiring and taking rest during night time.
Reason (R): Koel lays its eggs in the nests of tailor bird.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 

Subtopic:  Study of Aves & Mammals |
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Given below are two statements: 
Assertion (A): Bats and whales are classified as mammals.
Reason (R): Bats and whales have four-chambered heart.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Study of Aves & Mammals |
 77%
From NCERT
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Assertion(A) : Tapeworms, round worms and pin worms are endoparasites of human intestine.
Reason (R) : Improperly cooked food is the source of all intestinal infections.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
 
Subtopic:  Phylum Ctenophora | Phylum Aschelminthes | Phylum Platyhelminthes |
From NCERT
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Given below are two statements: 
Assertion (A): The duck-billed platypus and the spiny ant-eater, both are egg laying animals yet they are grouped under mammals.
Reason (R): Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Study of Aves & Mammals |
 64%
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Assertion (A) : In Mollusca, feathers like gills are present in the mantle cavity.
Reason (R) : These gills have respiratory and excretory functions.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Phylum Mollusca |
 62%
From NCERT
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Assertion (A): Claspers are present in males of the class Chondrichthyes.
Reason (R): Claspers assist copulation.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
From NCERT
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Assertion (A) : The organisms of Platyhelminths are usually hermaphrodites.
Reason (R) : These organisms possess internal as well as external fertilization.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Phylum Platyhelminthes |
 70%
From NCERT
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Given below are two statements: 
Assertion (A): Teeth of mammals are heterodont.
Reason (R): Mammals possess more than a single tooth morphology.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Study of Aves & Mammals |
 74%
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Assertion (A) : Reptiles are poikilotherms.
Reason (R) : Reptiles possess eggs with shells which helped them to adapt in land environment.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Study of Reptilia |
 80%
From NCERT
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Given below are two statements: 
Assertion (A): Echinoderms possess an endoskeleton of calcareous ossicles.
Reason (R): These organisms are marine or freshwater dwellings.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
 

 
Subtopic:  Phylum Echinodermata |
 69%
From NCERT
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