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MAJOR EVENTS DURING GASTRULATION -
1. There is rearrangement of cells due to morphogenetic movement of the cells of blastoderm.
2. The three primary germ layer get differentiated.
3. The cleavage rate is slowed down.
4. Growth if any, is insignificant.
5. Oxidation becomes, intensified so oxygen consumption increased and the nature of metabolism changes.
6. Nuclei become physiologically active and control activities of embryonic cells. The influence of paternal chromo- somes on the embryo becomes evident.
7. Synthesis of new kinds of proteins begins.
Self- vs. Cross-Pollination A major advantage of self-pollination is its certainty. Continued self-pollination over many generations, however, results in weaker progeny. This
Explain Nutrient Cycling and their processes? Two major processes are common to all ecosystems: nutrient cycling and the flow of energy. These two functions are carried out by
Measurement of Nitrogenase Activity There are various methods to find out whether an organism is a N 2 -fixer or not. If an organism can grow in normal atmosphere without any
In the preceding block you learnt the Darwinian premise of natural selection based on certain facts and deductions thereof. You would have noticed that one of the foundations for t
What are the types of plant geotropisms? Why do the stem and the root present opposite geotropisms? The parts of geotropisms are the positive geotropism, that in which the plan
What is signifying by "gene locus"? The Gene locus (locus means place) is the location of a gene in a chromosome that is the position of the gene in a DNA molecule
Interactions between Volatile Substances and Proteins Flavour binding may involve adsorption at the surface of food or penetration to the food interiority by diffu
Explain Heat Preservation - Method of Food Preservation? The process of heating was used centuries before its action was understood. Food is heated up or cooked. Heat kills mi
what are the excretory organs of birds
Are sperms being attacked by the body since they are foreign?
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