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Life Forms - Qualitative Characters
The form and structure of terrestrial communities are determined by the nature of vegetation. Vegetation may be classified according to growth form. The plants may be tall or short, herbaceous or woody, evergreen or deciduous. We might speak of trees, shrubs, and herbs, and then further sub-divide these categories into needle-leaved evergreens, broad-leaved evergreens, broad-leaved deciduous, shrubs, ferns, grasses and so on and so forth.
A more useful system was proposed by a Danish botanist, Christen Raunkiaer in the year 1903. In this system, instead of considering plants' growth form, he classified plants by life form, the relation of their height above ground to their perennating organ. A perennating organ is one that survives from one growth season to the next, remaining inactive over winter or dry periods. Perennating tissue is the embryonic or meristematic tissue of buds, bulbs, tubers, roots and seeds.
what is the modes of reproduction
a) How do viruses enter plant body and spread to long distances within it? b) Mention any two ways by which viruses spread from single plant to another.
Gills - Respiration Gills are highly vascularised extensions of gas exchange membranes. The simple type may be extension of the body surface as in sea-slugs, sea stars and ma
An increase in the calcium conductance of all sarcoplasmic reticulum membranes of a skeletal muscle with no external forces on it leads to A. increased binding of calcium ions
what are the general characteristicss of porifera
Various ways/techniques suggested for control of water pollution are as follows: 1. Pollutants (radio active, chemical, biological) present in water bodies can be removed by app
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Define Field Test used to Assess Aerobic Capacity? A field test that has been used extensively in nutrition studies to assess aerobic capacity measures Heart Rate responses to
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Q. Hutchinsons System of Classification? John Hutchinson, a renowned British Botanist proposed 24 phyletic dicta or principles and based on these dicta he published a phylogene
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