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Which one of the following in birds, indicates their reptilian ancestry?
[2008]
- a)Scales on their hind limbs
- b)Four-chambered heart
- c)Two special chambers crop and gizzard in their digestive tract
- d)Eggs with a calcareous shell
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Which one of the following in birds, indicates their reptilian ancestr...
The characteristic feature which indicates that birds have reptilian ancestry is the presence of scales on their hind limbs
The digestive system of reptiles is similar to that of all higher vertebrates whereas the bird's digestive is the crop, the proventriculus, and the gizzard.
Birds lay hard-shelled calcareous eggs, but most reptiles lay soft-shelled ones.
Most reptiles have 3 chambered heart whereas birds have a four chambered heart.
The digestive system of reptiles is similar to that of all higher vertebrates whereas the bird's digestive is the crop, the proventriculus, and the gizzard.
Birds lay hard-shelled calcareous eggs, but most reptiles lay soft-shelled ones.
Most reptiles have 3 chambered heart whereas birds have a four chambered heart.
Most Upvoted Answer
Which one of the following in birds, indicates their reptilian ancestr...
Reptilian Ancestry in Birds
Birds are descendants of reptiles and share some common characteristics with them. Some of the features that indicate their reptilian ancestry are:
Scales on their hind limbs:
- The presence of scales on the hind limbs of birds is a characteristic feature of reptiles.
- The scales provide protection and aid in movement.
- This feature is absent in mammals and is a clear indication of their reptilian ancestry.
Eggs with a calcareous shell:
- Another feature that links birds to their reptilian ancestors is the presence of eggs with a calcareous shell.
- The calcareous shell provides protection to the developing embryo and also helps in retaining moisture.
- This feature is absent in mammals and is a clear indication of their reptilian ancestry.
Other features that link birds to their reptilian ancestors are:
- Presence of a beak instead of teeth
- Presence of a cloaca
- Similarities in the structure of their bones and muscles
Conclusion
Birds are descendants of reptiles and share some common characteristics with them. The presence of scales on their hind limbs and eggs with a calcareous shell are clear indications of their reptilian ancestry.
Birds are descendants of reptiles and share some common characteristics with them. Some of the features that indicate their reptilian ancestry are:
Scales on their hind limbs:
- The presence of scales on the hind limbs of birds is a characteristic feature of reptiles.
- The scales provide protection and aid in movement.
- This feature is absent in mammals and is a clear indication of their reptilian ancestry.
Eggs with a calcareous shell:
- Another feature that links birds to their reptilian ancestors is the presence of eggs with a calcareous shell.
- The calcareous shell provides protection to the developing embryo and also helps in retaining moisture.
- This feature is absent in mammals and is a clear indication of their reptilian ancestry.
Other features that link birds to their reptilian ancestors are:
- Presence of a beak instead of teeth
- Presence of a cloaca
- Similarities in the structure of their bones and muscles
Conclusion
Birds are descendants of reptiles and share some common characteristics with them. The presence of scales on their hind limbs and eggs with a calcareous shell are clear indications of their reptilian ancestry.
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Community Answer
Which one of the following in birds, indicates their reptilian ancestr...
Presence of scales in the body and calcareous shells of eggs are the characteristics of reptiles. its presence in birds would show that birds have been evolved from reptiles. thus, op A and D .
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Which one of the following in birds, indicates their reptilian ancestry?[2008]a)Scales on their hind limbsb)Four-chambered heartc)Two special chambers crop and gizzard in their digestive tractd)Eggs with a calcareous shellCorrect answer is option 'A'. Can you explain this answer?
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