The Plant Of The Pteridophytes Essay

The Plant Of The Pteridophytes Essay

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Evolution

Most botanists believe that the Pteridophytes also known as ferns are descendants of the Rhyniopsida, an extinct group of free-sporing plants which originated in the Silurian period (about 430 million years ago) and went extinct in the mid-Devonian period (about 370 million years ago).

Physiology

Ferns has no flowers, no seeds, and no fruits. A fern is defined as a cryptogam which means a plant that has no true flowers or seeds. With sporangia, a receptacle in which asexual spores are formed evolving from the leaf.

Physical characteristics

A fern plant generally consists of one or more fronds attached to a rhizome, which is a continuously growing horizontal underground stem. A frond is simply the leaf of the fern. The sizes of ferns and their fronds vary considerably among the different species.

The fern frond develops from a leaf bud referred to as a crozier. The crozier is coiled up in most species, with the frond apex at the middle of the coil. The reproductive cells of ferns are microscopic spores which are often clustered together in the brown spots visible on the fronds ' undersides.

Habitat and distribution

The majority of ferns inhabit warm, damp areas of the Earth. Growing mostly in tropical areas, ferns diminish in number with increasingly higher latitudes and decreasing supplies of moisture. Some ferns play a role in ecological succession, growing from the crevices of bare rock exposures and in open bogs and marshes prior to the advent of forest vegetation. The best known fern genus over much of the world, is often succeeded by woody vegetation. Because of their ability to disperse by spores and their capacity to produce bothsex organs on the same gametophyte, it would seem logical to assume that fern...


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...The second stage in the life cycle of a fern is the adult stage. If direct sunlight falls onto the young fronds for an extended period of time, the plant may die easily. When the veins are matured, moisture from the ground will be transported easily to the outermost leaves and the plant can withstand periods of direct sunlight. After the plant is large and mature, it will grow spores on the undersides of its leaves and the life cycle of a fern will begin again.










Morphology

Ferns consist of stems, leaves and roots.

Stems: Fern stems are often referred to as rhizomes, even though they grow underground only in a some of the species.

Leaf: The green, photosynthetic part of the plant is technically a megaphyll and in ferns, it is often referred to as a frond.

Roots: The underground non-photosynthetic structures that take up water and nutrients from soil.

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