Q. Degeneration of elastic tissues in tunica media of blood vessels cause

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Q. An external factor influencing growth is

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Q. Process of formation of germ layers is called

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Q. Fertlization in chick normally takes place just as ovum is entering the

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Q. During cell division phase, number of cells increase by

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Q. Of all environmental factors two most important ones controlling growth of plants are

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Q. Vitamin deficiencies are induced in plants if they are grown in

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Q. Nucleus in acetabularia lies in the

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Q. In plants, without supply of oxygen

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Q. Secondary growth leads to increase in

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Q. Spemann performed experiments on zygote of

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Q. Primary tissue is added by

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Q. If sea urchin egg at two cell stage is shook to separate two cells,

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Q. From two cell of salamander zygote, one that kept dividing had

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Q. Lateral meristems are present in

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Q. Powerful growth zones found at apices of roots and stem are called

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Q. Cell elongation takes place if favoured by

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Q. Energy to growing plants is supplied by

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Q. When folding of neural plate is clearly visible, embryo is termed as

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Q. In plants, when only apical buds grow and growth is supressed in lower axillary buds, it is called

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