Q22 of 27 Page 49

What does Fig. 9.1 represent?

The figure represents binary fission method of asexual reproduction, in which the division of a nucleus into two halves is shown. The given figure is of an amoeba undergoing the first stage of binary fission.


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20

State whether the following statements are True or False. If false, correct the statement:

(a) External fertilization can occur both in water and on land.


(b) The eggs of fish are covered by hard shells for protection.


(c) The human egg has a head, middle piece, and tail.


(d) In adult human females, a single mature egg is released into an oviduct every month.

 21

Why do only male gametes have a tail?

 23

Observe the figure given as Fig. 9.2 and answer the questions that follow.


(a) Label A and B.


(b) Identify the process.


(c) What happens during this process and what is formed?

 24

How can we say that fish exhibits external fertilization?