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Soil-Environmental Components
The word soil is derived from Latin word 'solum' meaning earthy material in which plants grow. The soil is the consolidated outer layer of the earth's crust ranging in thickness from a mere film to three metres or more. It provides mechanical anchorage to plants, besides being a reservoir of water and plant nutrients. The soil also supports a rich and highly diversified micro-flora and fauna.
Typically, soil is a complex mixture of inorganic and organic materials. The inorganic materials, that is, the mineral constituents of soil are derived from parent material (the soil forming rocks) by fragmentation and weathering. The pore spaces formed between the mineral particles of soil are filled with water and gases. The organic components of soil comprise organic wastes, dead remains of plants and animals, and their decomposition products. Besides, a large variety of algae, bacteria, fungi and many small and large animals are invariably present in a fertile soil.
HARD Y - WEINBERG LAW - Proposed by G.H. Hardy and W. Weinberg in 1908 independently. The law states "the frequency of genes or alleles in a population remains constant
What are plant hormones? Plant hormones, also known as phytohormones, are substances that control the embryonic development and the growth of the adult plant.
Where in the leaves is the photosynthetic tissue often located? The major photosynthetic tissue is the photosynthetic parenchyma (also called as chlorenchyma, do not confuse wi
Which are the types of neurons that participate in the spinal arch reflex? Where are their cell bodies situated? In the arch reflex first a sensory neuron located in the gangli
DK is a year old female who was born after a normal pregnancy and delivery. At 17 months of age DK showed signs of speech delay, increased lethargy and vomiting up to four times p
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Evolution of Photosynthesis and Aerobic Respiration It is assumed that the earlier form of the bacteria utilised H 2 S for the preparation of food. The following reaction shows
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Explain Changing Body Composition with Ageing? With ageing, a progressive decline in the water content and the lean body mass is accompanied by an increasing proportion of body
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