Q. In chick of 18 hours, flat thickened area of ectoderm is seen as

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Q. Final size of a given cell type is attained during

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Q. Primitive ridges are thickened margins of

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Q. During gastrulation blastoderm splits into

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Q. Gray equatorial cytoplasm produces

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Q. Walls of many kind of cells and tissues become pitted during

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Q. Regeneration characteristic of algae was showed by

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Q. Morphogenetic determinants are present in

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Q. In bird's egg, process of cell division is confined to small disc of protoplasm lying on surface of

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Q. Great power of regeneration is present in

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Q. Peripheral part of blastoderm where cells lie unseparated from yolk is termed as

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Q. Least temperature at which growth can continue is

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Q. Changes is intracellular substances during aging includes

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Q. Vitamins are synthesized within plant body in presence of

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Q. In vascular plants growth occurs through activity of

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Q. Xylem, phloem, leaves, shoots and roots are completely formed in

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Q. Young tissues or group of cells in plants that retain potential to divide are called

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Q. In plants duration of light affects, the

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Q. Phenomenon in which light duration induce or supress flowering is called

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Q. Abstinence from smoking and maintaining ideal weight can prolong life by an average of

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