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Light Requirement - Seed Dormancy
The light requirement for germination of many seeds is presumably a mechanism that prevents the germination of small seeds buried deep underground, where they would exhaust their reserves before reaching the surface ad becoming autotrophic. However, after a fire many seeds germinate at once, and forest regeneration begins.
This mechanism prevents overcrowding in a mature forest and ensures rapid re-growth after a disaster. Not all seeds require light for germination; some are unaffected and a few are inhibited by light. Blue light at quite high intensity has some effect on the germ ination of certain seeds, but it is not clear whether this is mediated through the absorption of blue light by phytochrome or by some other pigment.
State two ways in which cardiac muscle is microscopically similar to skeleton muscle.
Explain Cancer and Inhibition of Tumorigenesis? Polyphenols appear to play a preventive role although the molecular mechanisms of action and applicability to human cancer preve
Algae have cell wall made up of: 1. Cellulose, galactans and mannans 2. Hemicellulose, pectins and proteins 3. Pectins, cellulose and proteins 4. Cellulose, hemicellulo
Q. How to Use a Key? The use of a key is analogous to travelling a high way, that forks repeatedly, each fork having roadside directions. If a traveller follows the proper dire
How old is the earth? It is believed that the earth is about 4.5 billion years old.
does earthworm have rbc.
Purpose of Therapeutic Dietary Adaptations A therapeutic diet is a quantitative/ qualitative modified version of a basic nutritious diet which has been tailored to suit the c
State what is Genetic engineering Genetically engineered plant-incorporated protectants are created by a process that utilizes several dissimilar modern scientific techniques
Monosaccharides :- Sugars consisting of a single polyhydroxy aldehyde or ketone unit.
Transport system in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. It p
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