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Gymnosperm Characteristics PPT


Plant Science PPT

Gymnosperms General Characters PPT
(General Characteristics, Life Cycle and Reproduction of Gymnosperms PPT)

What are Gymnosperms? Characteristics of Gymnosperms, Morphology of Gymnosperms, Reproduction of Gymnosperms, Anatomy of Gymnosperms, Male Cone and Female Cone, Microsporophyll and Megasporophyll, Microsporangium and Megasporangium, Megaspore and Microspores of Gymnosperms; Male and Female Gametophytes of Gymnosperms, Fertilization, Zygote and Embryo development of Gymnosperms, Life Cycle and Alternation of Generation of Gymnosperms

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Botany lecture notes

General Characters of Gymnosperms (Lecture Notes with PPT)


characteristics gymnosperms

Gymnosperms – Characteristics
(Morphology, Reproduction and Life Cycle of Gymnosperms with PPT)

Gymnosperms are primitive seed-producing plants of Spermatophytes (Phanerogams). They are ‘Naked-Seed’ Plants. The term is derived from two Greek words: ‘gymnos’ meaning naked and ‘sperma’ meaning seeds. They are characterized by naked ovules (i.e., ovule without the ovary). The ovules of Gymnosperms are borne directly on the surface of the megasporophyls. Unlike Angiosperms, in Gymnosperms the seeds are NOT enclosed in the fruit. Thus the Gymnosperms are also known as “Phanerogams without ovary”.

seeds of gymnosperms

General Characteristics of Gymnosperms

Distribution

Ø  Gymnosperms are a small ancient group of seed plants consisting of 83 genera and 1080 species.

Ø  Distribution: Temperate and Tropical regions.

Ø  Gymnosperms were originated in the Paleozoic Era (541 – 252 million years ago).

Ø  They were the dominant plants of Jurassic and Cretaceous periods of the Mesozoic era.

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