CBSE Class 10 Answered

The structural limitations of human body are:

1. Man has binocular vision, that is, both the eyes are trained upon the same field simultaneously.

2. Due to bipedal locomotion, man is less stable than a quadruped.

3.  The sense of smell and hearing power of man is not as acute as we find in some other animals.

4. Man is deprived of tail which serves as a balancing organ in animals that have it.

5. The muscles of pinna are vestigial. The pinna cannot move to gather sound waves.

6.  Man does not harbor the kinds of intestinal bacteria cows and horses do. These bacteria secrete enzymes to digest plant carbohydrates and also produce vitamins. Hence, man cannot digest cellulose.

7. Unlike most primates, man is sparsely covered with hair. This exposes man to cold.

(Although there is a layer of fat underneath the skin in man which protects him from severe cold, and there are sweat glands to dispose of excess heat, these are disadvantages for continuous working or running.)

8. Man cannot work or run continuously for several hours.