Question

a) What is the significance of human testis being located in the scrotum?
a
b) What is pollination? Write four points of difference between self and cross pollination.​

Answer 1

Answer:

1. The testes are located in the scrotum to maintain testicular temperature at several degrees below core body temperature, a necessity for normal spermatogenesis.
2. Pollination is the sexual method of reproducing in all plants by the process of transferring the pollen grains from the anther to the stigma of the gynoecium and thereby permitting the fertilization process.

Explanation:

hope it helps;

please mark as brainliest

Answer 2

Explanation:

(a) The testes which are located in the scrotum precisely outside the abdominal cavity produce a hormone called testosterone and make sperms as well.

(b) Pollination refers to the transfer of pollen grains from the anther to the stigma of a plant.

The difference between self Pollination and cross Pollination is :-

self Pollination :-

(I) It is the transfer of pollen grains from anther to the stigma of the same flower or another flower born on the same plant .

(ii) produces homozygous series.

(iii) doesn’t require external agents

(iv) no variation .

cross Pollination :-

(i) It is the transfer of pollen grains from the anther to the stigma of another flower which is born a different plant of the same species

(ii) produces heterozygous series .

(iii) requires external agents like water , insects .

(iv) shows variation .

hope it helped :)