1.

(i) What is fertilisation? Distinguish between external fertilisation and internal fertilisation. (ii) What is the site of fertilisation in human beings?

Answer»

(i) Fertilisation is defined as the fusion of a male gamete (sperm) with a female gamete (an ovum or egg) to form a zygote during sexual reproduction.

External Fertilisation Internal Fertilisation
(i) The fusion of male gamete (sperm) and female gamete (ovum) occurs outside the body.(i) The fusion of gametes occurs inside the body
(ii) Both individuals discharge their gametes outside the body.(ii) Only the male discharges sperms into female genital tract.
(iii) Development occurs outside the body(iii) Development occurs inside the body.
(iv) Example: Frog.(iv) Examples: Human, birds, cattle, etc.

(ii) The site of fertilisation in human beings is in the fallopian tube of female reproductive system.


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