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Perception of Light - Floral Induction
Stimulus Leaves are found to be organs that perceive light 'stimulus', K.C. Hamner and J. Bonner showed in 1938 that even if all the leaves are stripped in a cocklebur plant and only as little as one eighth of a leaf is allowed to stay on the plant would flower in response to one short day exposure. The 'stimulus' continues to stay even when the plants are brought under non-inductive conditions. Moreover, this stimulus can be 'transferred' to another plant through grafting. Chailakhyan's classical grafting experiment using short day Nicotiana species and long day Nicotiana species clearly established this point. He suggested for the existence of 'Florigen'-a flowering hormone. So far it has not been possible to isolate the flowering hormone, although there is evidence to suggest that it consist of
For the present flowering may be considered to be controlled by the balance between GA, cytokinin and ABA.
Which are the living beings that carry out photosynthesis? Which is the cell organelle responsible for the absorption of light for the photosynthesis process in plants and algae?
How is snow - blindness caused in humans? a) Mention the site where syngamy happens in amphibians and reptiles correspondingly.
Synthesis of Hormones - Testies Leydig cells and the Sertoli cells are the steroid hormone synthesising cellular sites of the testis. Leydig cells are the major source of the
How is synthesis of soluble proteins taking equatorial part on the surface of lens? Synthesis of soluble proteins taking equatorial part on the surface of lens as follows: 1
Explain the Human Milk Composition and Infant Growth and Development? This sub-section deals with composition of human milk, compares human milk with cow's milk and why human m
activity
What phrase best describes oxidation- reduction reaction? A. phosphoryrylation energezing endergounic reactions b. transferring of electrons from one molecule to another c. shar
Define the meaning of Population Structure? The structure of population can be viewed as to how the population is composed of in terms of age and sex. The structure of populati
Cell structure and function All organisms, whether simple or complex, plants or animals. are composed of cells. For example, a bacterium or an amoeba is made up of just one cel
Constrictive Pericarditis : It is usually the end stage of inflammatory process involving pericardium. In developing world, infection with mycobacterium tuberculosis is still com
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