Name any three germ-killing secretions of our body.

Explain the following terms:

b. Gene

The diagram given below is that of a developing human foetus in the womb. Study the same and then answer the questions which follow:

(i) Name the part labelled 1.
(ii) Mention any two functions of the part labelled 2.
(iii) Explain the role played by the part labelled 3.
(iv)What is the normal gestation period (in days) of the developing foetus? 

Mention three adaptations found in plants to reduce transpiration

State Mendel's law of segregation

Explain the following terms:

a. Monohybrid cross

Name the two sex-linked diseases in males.

Mention two activities of the Red Cross. 

Explain the following terms:

c. Phenotype

What are the age restrictions for marriage of boys and girls In India?