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CBSE 10th Standard Science Subject Heredity and Evolution Ncert Exemplar 2 Mark Questions 2021

Published on: 26/05/2021

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Questions:

Generic 2

5 x 2 = 10

In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a better body design? Why or why not?

Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?

Mention three important features of fossils which help in the study of evolution.

Do genetic combination of mothers play a significant role in determining the sex of a new born?

How is the sex of a newborn determined in humans?

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Answers Key:

Generic 2

5 x 2 = 10

Evolution shows that body design changed from simple to complex. Hence, bacteria has the simplest body design and chimpanzee has the most complex and better body design.

The small number of tigers are causing a worry for the genetics because if they become extinct then the genes of this species will be lost forever. There will be no scope of again getting this species back to life without their genes.

(a) It helps to calculate the tome period of the organisms
(b) It represents preservation of ancient species
(c) It helps to establish evolutionary traits among organisms and their ancestors.

No, mother does not play a significant role in determining the sex of newborn body. As the mothers have a pair of X-chromosomes. So all children will inherit an X-chromosome from their mother regardless whether they are boys or girls.

The sex of the individual is genetically determined from parents. A new born who inherits an 'X' chromosome from father will be a girl and one who inherits a 'Y' chromosome will be a boy.