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Light Stratification - Lake Ecosystem
The penetration of light in water bodies is limited depending on the transparency of water and its ability to absorb light. On the basis of light penetration lakes become vertically stratified into two basic layers
(1) The upper trophogenic zone corresponding roughly to the photic zone in which photosynthesis dominates and the lower, and
(2) Tropholytic zone where' decomposition is most active and which corresponds to the aphetic zone.
Between these two zones is the compensation depth - the depth at which light intensity is such that the photosynthetic production is just enough to balance respiratory losses and beyond which light penetration is so low that it is no longer effective. Generally compensation depth occurs where light intensity is about 100 foot candles or approximately one per cent of full noon sunlight incident to the surface.
Biological Significance of Incompatibility Both interspecific and intraspecific incompatibility determines the degree of inbreeding and out breeding of plants. Self-incompati
The Father of Botany (370-285 B.C.); of all the men who ever lived upon the earth certainly one of the most remarkable was Theophrastus of Eresus who was born about 370 B.C. on the
What is Stem cell therapy Most defects / diseases treated by stem cell therapy are not genetic in origin so the therapy will have no impact on gene pool in terms of change in f
Why does the urinary volume increase when alcoholic beverages are ingested? Alcohol inhibits the ADH (antidiuretic hormone) secretion by the hypophysis. Low ADH decreases the t
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Process of nuclear reorganization in protozoa in which nucleus divides, each half undergoes a maturation, and two persisting functional nuclei reunite is termed as: a) Autogamy
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Tingling or numbness is seen in cases of neuropathy. It occurs gradually over time. As high sugar (glucose) in the blood damages the nervous system, particularly in the extremities
Explain the term osmosis
Q. What do you mean by Chromosome Number? We are generally aware that the number of chromosomes in each cell of all individuals of a single species is constant. ,It is also est
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