Question

define juvenile phase ,reproductive phase and senescent phase.

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Answer 1

Answer:

Juvenile phase : It is the period of growth after birth in an individual organism, and before it meets reproductive maturity.

Reproductive phase : It is the period when an individual organism reproduces sexually.

Senescent phase : It is the time when an organism grows older and loses the reproductive capacity.

Answer 2

Answer:

(i) Juvenile phase. The period of growth in life of organisms before they start reproducing sexually and attain a level of maturity is called juvenile phase. It is known as Vegetative phase in plants.

(ii) Reproductive phase. The period of active reproductive behaviour when the organisms show marked morphological and physiological changes is called reproductive behaviour. It is followed by senescence phase.

(iii) Senescence phase. The period when the reproductive phase ends and concomitant changes occur in the body such as slowing of metabolism is called senescence phase. It is the last phase when the organism grows old and it is followed by death.