Why animals which undergo external fertilization such as frog and fish lay eggs in hundreds while a hen lays only one egg at a time?

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: The honey bee queen copulates only once in her life time. Reason: The honey bee queen can lay fertilized as well as unfertilized eggs.

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: All birds except the ones like Koel build nests for retiring and taking rest during night (day time for nocturnal birds). Reason: Koel lays the eggs in the nest of tailor bird

Which of the following is an egg-laying mammal?

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to ocean is

The egg of an animal contains 10 chromosomes, of which one is X-chromosome. How many autosomes would there be in the karyotype of this animal?

What is uricotelism ?In What way is it advantageous to the land animals which layed shelled eggs?

True and False: Reptiles lay thick shelled eggs which do not dry up in sun.