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Q.

Which of the following statements are applicable to birds?
a) Endoskeleton is made up of either cartilage or bone.
b) Crop and gizzard are the additional chambers in digestive tract.
c) Poikilothermic animals.
d) Air sacs connected to lungs supplement respiration.
e) Fertilisation may be external (or) internal.

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a

d and e only

b

b and d only

c

c and e only

d

a, b and d only

answer is B.

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Detailed Solution

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Birds are homeotherms. They have a bony endoskeleton. Fertilisation is internal.

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Which of the following statements are applicable to birds?a) Endoskeleton is made up of either cartilage or bone.b) Crop and gizzard are the additional chambers in digestive tract.c) Poikilothermic animals.d) Air sacs connected to lungs supplement respiration.e) Fertilisation may be external (or) internal.