Structure of Gametes


 
 
Concept Explanation
 

Structure of Gametes

Each sperm is a small cell of about 50 mu m length and 2.5 mu m diameter. It constits of a head. piece and the tail regions. The head consists of the nucleus and structure called the acrosome at the tip. The acrosome secretes lytic substance that break down the wall of the egg for fertilisation. The beating of the tail propels the sperms forward at the rate of 1 - 4 mm per minute.

                                        

Each egg or ovum is a spherical cell much bigger than the sperm. It mainly consists of a single nucleus and some reserve food made of lipid droplets.

Sample Questions
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Question : 1

Which of the following are correct :

(a) Each egg or ovum is a spherical cell much smaller than the sperm.

(b) A sperm has a head, a middle piece and a tail.

(c) Each egg or ovum is a spherical cell much bigger than the sperm.

Right Option : B
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Explanation
Question : 2

Which of the following are correct :

(a) The head of sperm consists of the nucleus and structure called the acrosome at the tip.

(b) Ovum mainly consists of a single nucleus and some reserve food made of lipid droplets.

(c) Sperm mainly consists of a single nucleus and some reserve food made of lipid droplets.

Right Option : A
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Explanation
Question : 3

Which of the following are correct :

(a) The male gamete in animals is called 'sperm'.

(b) The female gamete in animals is called 'egg' (or "ovum').

 

Right Option : C
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Explanation
 
 
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