Class 12 CBSE | Complete Biology Marathon With Previous Year Questions | By Pooja Ma'am

Class 12 CBSE | Complete Biology Marathon With Sample Paper Questions 2024-25 | By Pooja Ma'am

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04:10 - Human Reproduction
Answer 1: The testes if fail to descend into the scrotum known as cryptorchidism, this conditions produce sterility since testes, in order to perform spermatogenesis require 2-2.5*C lower temperature than body which is maintained by scrotum. The temperature is not favourable for testes to produce sperms thus leading to sterility.

Answer 2 : Sperms contains a filament which helps in motility of structure whereas ovum/egg lacks any motile structure. Thus, sperms and motile while egg is non-motile.

Answer 3:

Answer 4: Blastocyst.

Answer 5: oxytocin

14:23 - Sexual Reproduction in Flowering plants
Answer 1: The process of transfer of male gamete to the stigma of flower is known as pollination. The significance of pollination :-
(i) Pollination is the process due to which fertilisation occur and angiosperms are able to form fruits.
(ii) The pollination which occurs with the help of pollinating agents provides them with rewards.

18:25 Answer 2: Fertilisation is flowering plants is refer to as double fertilization because it involves two fertilization, which are mentioned below:
(i) Fertilization of egg cell
(ii) Fertilization of polar nuclei

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