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Growth Regulators - The growth of plants is regulated by certain chemical substances, which are synthesized by the plant in very small quantities. These substances are formed in one tissue or organ of the plant and are then transported to other sites where they produce specific ..

Growth Regulators - Growth substances are also called the phytohormones . The phytohormones have been put in five different categories based on their actions. They are: auxins gibberellins cytokinins ethylene abscissic acid The regulators associated with cell enlargement and dif..

Growth Regulators - Growth substances are also called the phytohormones . The phytohormones have been put in five different categories based on their actions. They are: auxins gibberellins cytokinins ethylene abscissic ac..

The heart is regulated to a large extent through the central nervous system. The heart nerve branches from the vagus nerve from the medulla oblongata and the sympathetic nerve fibres from the spinal cord. The vagus nerves are cardiac inhibitory nerves. When the vagus nerve is stimulated, ..

.g., nocturnal activity of some desert animals, long trips migration by many birds. E.g., Arctic terns, Siberian crane, American golden plover, Bison and caribou. vi) Homeothermy This is achieved through evaporation of sweat in the mammals from their bodies during summer and through insulation acti..

Question: What are growth regulators? Answer: Growth regulators are the chemicals that either promote or inhibit growth of the plants, their development and their responses to the environment. They are also called the phytohormone..

Question: Define osmoregulation. Answer: The process by which the water content and the ion concentration is regulated and kept constant in the cells is known as osmoregulatio..

Management of Wild Animals - Wild life management involves protection, preservation and perpetuation of species in their natural habitats. It involves the following approaches: a) Enactment of wild life legislations to regulate hunting. b) Species preservation to protect particu..

In 1961, two French microbiologists, Francois Jacob and Jacques Monod proposed a mechanism, called Operon Hypothesis , for the regulation of gene action in E. coli. It got them the Nobel Prize in 1965. fig. 23.1 - Francois Jacob and Jacques Monod with their Colleague They found that..

1. Quarantine regulations - Entry of diseased plants should be prevented. 2. Field sanitation - To destroy completely or partially the source of infection present in the soil. This is done by a) removal of diseased plant debris and their burning. b) use of chemical. c) crop rot..