Question

(a) Identify A, B and C in the given diagram and write their functions. (5)
(b) Mention the role of gamete and zygote in sexually reproducing organisms.

Answer 1

Answer:

the role of gamete us to produce the first cell of organism. And the role of zygote is to produce the first cell of live . Answer no B

Answer 2

(a) Identify the parts:

A = Stigma

B = Pollen tube

C = Egg cell

Functions:

(A) Stigma: It is a sticky surface. The pollen grains are attached to this surface and germinates.

(B) Pollen tube: It is a tube. This helps to move the pollen grains toward ovum.

(C) Egg cell: It is the female gamete. It fuses with male gamete and undergoes fertilisation to form zygote.

(b) Role of gamete:

• There are two gametes which are male and female. Their name differ according to the organisms.
• The gametes are haploid in nature.
• These play main part in reproduction.
• They contain genetic information of both male and female.
• The deformation in gametes results in the daughter cell formed (defect).

Role of zygote:

• Zygote is diploid in nature.
• When male and female gamete fuse, then zygote is formed.
• Formation of zygote is the first stage of fertilisation.
• The main function of the zygote is development of offspring.