Human Reproduction — BIOLOGY STD 12 Science — Question

All vertebrate embryos show some similarities at an early stage. Mention two such similarities. What do they indicate? Explain.

Enumerate the symptoms of common cold. Name the category of the organism causing it.

State Hardy-Weinberg principle. Name any two factors which affect it.

Give any four possible ill effects of contraceptives.

Write any three characteristics of a population

Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the process conducted by the doctor in either of the cases (male/female partner).

Explain any one feature of cloning conductor.

What is so special about tropics that might account for their greater biological diversity ?

Identify a, b, c and d in the following table with reference to birth control?

Method	Example
a	Diaphragm
Female sterilisation	b
c	Saheli
d	Cut

Why do we experience shivering during winters when the temperature is very low?