Words of Wisdom:

"the man who follows the crowd, gets no further than the crowd, the man who walks alone, finds himself places no man has ever known" stephen graham" - Whytee

Educate to Educare

  • Date Submitted: 11/13/2011 06:46 AM
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Chapter - 8
How Do Organisms Reproduce
Q. 1 A couple wants to space the birth of their second child. Suggest one preventive
method which could be observed 1 Mark
(a) By the husband (b) By the wife for the same.
Ans. (a) Use of condoms by the husband
(b) Use of oral pills or loop or Copper-T by the wife.
Q. 2 A girl attains her puberty at the age of 11 years and a boy at 13 years but, still
they are asked to refrain from sex, why? 2 Marks
Ans. They are asked to refrain from sex because:-
1. They are not physically, emotionally mature enough to be able to bear the
responsibility of the child.
2. They may suffer from reproductive tract infections.
Q.3 A pregnant woman visits a doctor to determine the sex of her child. The doctor
refused to perform the test. Why is she being denied? 2 Marks
Ans. The doctor refused to perform the test in order to prevent female foeticide which
leads to an alarming decline in child sex ratio.
Q. 4 Blue prints of body design are stored in the DNA. Why? 3 Marks
Ans. The chromosomes present in the nucleus of a cell contain information for inheritance
of features from parents to next generation in the form of DNA molecule. The DNA
is the information source for making proteins. Thus, blueprints of the body design
are stored in the DNA.
Q. 5 Producing individuals by parents consume a lot of energy. So, why should an
individual organism waste energy in the process, it does not need to stay alive?
3 Marks
Ans. Reproduction, unlike other life processes is not essential to maintain the life of an
individual organism. But it is essential for providing stability to the population of
Maintaining the species is essential for maintaining balance in nature.
Q. 6 Protozoan reproduce by binary fission as well as by multiple fission. In your
opinion which process is better and why? 2 Marks
Ans. Multiple fission is better than binary fission because:-
1. More number of individuals is produced.
2. It helps to tide...


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