Question

EXPLAIN
1) JUVENILE PHASE
2) REPRODUCTIVE PHASE
3) SENESCENCE PHASE

Answer 1

(a) Juvenile phase:
It is the period of growth in an individual organism after its birth and before it reaches reproductive maturity.
(b) Reproductive phase:
It is the period when an individual organism reproduces sexually.
(c) Senescent phase:
It is the period when an organism grows old and loses the ability to reproduce.

Answer 2

$\huge{\boxed{\sf{ANSWER}}}$

There are mainly three phases in the life cycle of an organism :

$\huge{\boxed{\sf{Juvenile \: Phase}}}$

>> This is the phase when the organism shows growth till the period it attains maturity.

>> Juvenile Phase in Plants is called the vegetative phase.

$\huge{\boxed{\sf{Reproductive \: Phase}}}$

>> In this phase, development and maturation of reproductive organs takes place.

>> Plants bears flowers in this phase to mark their reproductive phase.

$\huge{\boxed{\sf{Senescent \: Phase}}}$

>> In this phase, the individual grows old and dies.

>> Deterioration of body occurs which leads to death.