Supporting tissue consists of epidemics true or false if false give reason
Answers
Answer:
False
Explanation:
Supporting Tissues
The development of stable supporting elements has been an important prerequisite for the evolution of large terrestrial organisms. Animals have endo- or exoskeletons that correspond in function to the woody stems or trunks of plants. The architectural design of the plant's body of vegetation is very complex. Thin petioles carry heavy and flat laminas, stems support leaves, flowers and fruits. All plant organs are exposed to mechanical strains. Organs above ground follow the wind's drift. Their high elasticity lets them either return to their original position, or it makes them swing around an imaginative axis. Trunks are stable enough to resist the wind's pulling. They withstand pressure and are inflexible, although their projecting treetops provide the wind with a large target. The wind makes the upper plant organs and the trunk act like a lever, a large part of the force is hence exerted onto the roots, that anchor the plant in the soil. Other functions of the root are water and nutriment uptake.
The strength of tissues protects also against enemies. The hard shell of many seeds prevents a chewing to pieces or puncturing by animals and avoids that parasites like fungi or bacteria force their way into them.
The preceding topic mentioned the high water-content of plant cells that lends a high tension to plant tissues and is caused by the turgor. It supplies plant tissues with a certain stability. Its actual importance is seen best in wilting leaves or flowers after their water supply has been stopped. Extensive specialized supporting tissues exist only in vascular plants. Despite the existence of huge marine brown algae (seaweeds, like Macrocystis, Laminaria), not a single terrestrial alga, whose thallus raises more than a few cell layers above ground, is known. Vascular plants have up to three types of supporting tissue:
The collenchyma, a tissue of living cells,
the sclerenchyma, a tissue of nearly always dead cells, and
the vascular tissue consisting of both living and dead cells. It is responsible for the transport and dispersal of water, nutriments and assimilates.
All three types are reviewed below.
The larger a vessel plant is, the higher is its content of dead cells. Dead cells are exceptions among bryophytes, but very common in flowering plants. They are usually elongated (prosenchymatous) cells, in parallel to the axis of the respective organ and often combined in sheaves, the fibres. The botanist H. v. MOHL from Tübingen recognized already in the 30th of the 19th century that all these fibres spring from normal, living cells.
Supporting tissues reside generally in the periphery of plant organs. If the cells are combined in layers, tubes, whose stability is much greater than that of sticks of the same diameter are formed. The supporting tissues of ribbed or edged stems are concentrated in these ribs or edges. In submerse living vascular plants, the supporting tissue is reduced to a minimum.
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