Q18 of 27 Page 49

Mother gives birth to a baby but the baby has characters of both parents. How is this possible?

In the first step of reproduction, there is a fusion of the male and the female gametic nuclei. In this, the nucleus of the male gamete, sperm, fuses with the nucleus of the female gamete, the egg cell. As the nuclei carry genes, which result in the expression of characters, the zygote resulting from such fertilization, possess both male and female characters.


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16

Fill up the blanks with the terms given below:

body, asexual, binary, single, nucleus


Amoeba is a ___________ celled organism. It reproduces by ___________ reproduction. The process of reproduction begins by the division of its ___________ into two. This is followed by the division of its ___________ into two. This type of reproduction is called ___________ fission.

 17

The term metamorphosis is not used while describing human development. Why?

 19

How is a reproduction in hydra different from that in amoeba?

 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.