Question

Write short notes on the following: (i) Placenta formation
(ii) Red Data Book

Hint:

Remember: Placenta is both an excretory and nutritive organ.
The Red Data Book is crucial for planning conservation strategies.

Answer 1

(i) Placenta formation
The placenta is a temporary organ formed during pregnancy between the uterine wall of the mother and the fetus.
- It develops from maternal tissues (endometrium) and embryonic tissues (chorion).
- It allows the exchange of gases, nutrients, and wastes between the mother and fetus.
- It also secretes hormones like hCG, progesterone, and estrogen to maintain pregnancy.
(ii) Red Data Book
The Red Data Book is a public record maintained by the International Union for Conservation of Nature (IUCN).
- It provides a list of endangered and threatened species of plants and animals worldwide.
- It classifies organisms into different categories such as extinct, endangered, vulnerable, rare, etc.
- It is a useful guide for biodiversity conservation.