Question

Assertion : Old age is not an illness It is a continuation of life with decreasing capacity for adaptation.

Reason : Cessation of mitosis is a normal genetically programmed event

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (c) A is true but R is false

Explanation :

Old age is the result of ageing or senescence which may be defined as the progressive deterioration in structure and function of the body cells, tissues, organs and organ systems of the organism with their advancing age. here, the body's immune system loses its ability to effectively deal with the antigens. This reduces the resistance as will as adaptation of the body. Cessation of mitosis is not as such a genetically programmed event. During ageing, there is a decease in multiplication of cells, though it differs in various tissues.