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  • a) List two reasons for the appearance of variation among the progeny formed by sexual reproduction  b) 

a) List two reasons for the appearance of variation among the progeny formed by sexual reproduction 

b) 

1) name the part marked 'A' in the diagram 

2) How does 'A' reaches part 'B' 

3) state the importance of the part 'C' 

4) what happens to the part marked 'D' after fertilisation is over ? 

 

 

 

 

 
 
 
 
 

Answers (1)

(a)

1) Sexual reproduction causes variation in appearance in progeny because it involves the DNA of both parents 

2) During the process of DNA copying, the biological process cannot be truly accurate so, the person of DNA copying leads to some variation.

(b)

1 ) Part A is pollen grains 

2) 'A' reaches to 'B' by the process of pollination 'B' is the stigma of the carpel 

3) Part C is a pollen tube. Through this tube, male gamete reaches to egg ovule.

4) The part 'D' in the egg. After the fertilization process, the egg divides and form an embryo within the ovule.

Posted by

Priyanka Kumari

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