Question

Give scientific reasons for each of the following statements:
1. The animals like frog and fish lay hundreds of eggs at a time.
2. Many young boys & girls get pimples and acne on the face during puberty.

Answer 1

1) In animals such as frogs and fishes, the process of fertilization takes place outside the body. This type of fertilization is known as external fertilization. In these animals large number of eggs and sperms are released at a time.In external fertilization, sperms do not have a definite route to reach the eggs. So, they are released in large amounts to increase the chances of fertilization. In addition to it the eggs to do not have protection and they can be easily destroyed by the predators. So, their large numbers enables adequate number of eggs to get fertilized even if some eggs are destroyed.

2) Pimples are caused due to hormonal imbalance during adolescence. Pimples occurs due to the blockage of pores and follicles present on face by sebum, an oily liquid secreted from the sebaceous (oil) glands. When these follicles get blocked, it results in the accumulation of oil under the skin, which causes the dead cells to clump together, forming a plug at the opening of the pore which blocks the movement of oil to the surface of the skin resulting in the formation of pimples.