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Temperature - Seed Dormancy
Low temperature treatment is an essential prelude to germination in many seeds, and high temperature may be inhibitory at the time of germination. The low temperature chilling requirement is frequently met artificially by the process of stratification. The seeds are layered in trays in cold moist air for a period of several weeks or months. Temperatures between 0 and 10?C are most effective. The chilling requirement is variously located in the embryo or the seed coat, sometimes in both. The chilling requirement of apple seeds, for example, is much longer for intact seeds than for seeds with the coats removed, or for isolated embryos. Red light and GA have a synergistic effect, that is, the combination of both factors stimulates germination more than the sum of the two separately.
In organisms that have undergone tagmosisthe trunk often develops into two tagma, oneinvolved in locomotion and one that is notlocomotory. The tagma not involved in locomotionis re
Industrial melanism refers to the dark pigmentation that evolved in some insects giving them protective coloration on vegetation darkened by soot in heavily industrialized areas pr
I nfectious bronchitis (IB) Infectious bronchitis is a highly contagious respiratory disease of poultry, caused by a virus belonging to the family Coronaviridae. Its existence
Outline the importance of buffer systems in the human body. In addition, describe the main biological buffer systems and how they function.
Other Complications : Bioprosthetic valves have a tendency for degeneration, calcification or cusp perforation. Current models have overcome many of these problems. Calcification
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Ways to adapt to stress Now that you know the nature of stress, let us see what type of strategies plants have acquired to adapt to stress. You know that biological functions
typical growth curve in plants
What is Nervous System? The nervous system is made up of associations of cells called neurons. Bundles of neurons are called nerves. The nervous system is divided into two part
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