In birds:

a: the characteristic feature is the presence of feathers.
b: forelimbs are modified into wings.
c: flight is present in all members.
d: hind limbs do not have scales.

1. Only (a) and (d) are incorrect
2. Only (c) and (d) are correct
3. (a), (b) and (c) are correct
4. Only (a) and (b) are correct

Subtopic:  Study of Aves & Mammals |
 88%
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Birds are not characterized by:
1. a fully ossified endoskeleton
2. pneumatic long bones
3. absence of crop and gizzard in the digestive tract
4. a dry skin without glands except the oil gland

Subtopic:  Study of Aves & Mammals |
 86%
From NCERT
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Consider the given two statements:

I: Birds have a four chambered heart and are warm blooded.
II: Respiration in birds is by lungs that are connected to air sacs.
1. I is correct but II is incorrect
2. Both I and II are correct.
3. Both I and II are incorrect.
4. I is incorrect but II is correct.
Subtopic:  Study of Aves & Mammals |
 91%
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In birds:
I: The digestive tract of birds has additional chambers, the crop and gizzard.
II: Air sacs connected to lungs supplement respiration.
III: They possess beak with teeth.
 
1. Only I and II are correct 2. Only I and III are correct
3. Only II and III are correct 4. I, II and III are correct
Subtopic:  Study of Aves & Mammals |
 73%
From NCERT
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You find the skeletal remains of an animal which show the following features:
I: It is fully ossified [bony]
II: Long bones are hollow
The organism most likely is a:
1. Mammal
2. Reptile
3. Bird
4. Amphibian
Subtopic:  Study of Aves & Mammals |
 93%
From NCERT
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How many of the given statements regarding birds are correct?
I: They have feathers and most of them can fly.
II: They possess beak.
III: They have scales on the forelimbs and hindlimbs are modified into wings.
IV: They have dry skin without glands except the oil gland at the base of the tail.
V: They possess a fully ossified (bony) endoskeleton.
VI: They have long bones that are solid without air cavities (pneumatic).
 
1. 3 2. 4
3. 5 4. 6
Subtopic:  Study of Aves & Mammals |
 60%
From NCERT
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Identify the incorrectly matched pair:
Biological name Common name
1. Aptenodytes Penguin
2. Pavo Peacock
3. Struthio Pigeon
4. Psittacula Parrot
Subtopic:  Study of Aves & Mammals |
 78%
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The most unique characteristic of mammals is the presence of:
1. a four chambered heart 2. a single aortic arch
3. homeothermy 4. mammary glands
Subtopic:  Study of Aves & Mammals |
 93%
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Regarding mammals:
I: The most unique characteristic is the presence of mammary glands.
II: Skin is unique in possessing hair.
III: Heart is unique in being four-chambered.
IV: Viviparity is a unique feature.

1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic:  Study of Aves & Mammals |
 88%
From NCERT
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Identify the incorrect statements regarding mammals:
I: External ears are absent 
II: All teeth are of the same type 
III: They are homoiothermous 
1. Only I and II 
2. Only I and III 
3. Only II and III 
4. I, II and III
Subtopic:  Study of Aves & Mammals |
 76%
From NCERT
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