Juvenile phase – Class 12 | Chapter – 1 | Short Notes Series PDF

Juvenile phase

Juvenile phase is the period of growth in an individual organism after its birth and before it reaches reproductive maturity. It is also called vegetative phase in plants.

A juvenile is a living being that has not yet attained adulthood, sexual maturity or physical size. Juveniles can have a substantially different appearance than adults, especially in terms of colour, and they may not fit the same niche as adults. In many creatures, the juvenile is referred to as something other than the adult (see List of animal names).

Many insects, for example, reach sexual maturity in a short transformation called eclosion. For some, the transition from juvenile to fully adult takes longer — for example, puberty in humans. Juveniles undergoing this metamorphosis are frequently referred to as subadults.

When invertebrates achieve adulthood, they are totally developed, and their development and growth come to a halt. Their larvae or nymphs are their juveniles.

In plants the juvenile phase is mentioned as vegetative phase. In few viviparous organisms the embryo development from the fertilized eggs are carried out inside the uterus of the female and the resulting offspring is called juvenile. The nourishment to the embryo is through the placenta. The appearance of flowers in plants marks the reproductive phase.


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