Q. Hypoblast is mainly presumptive

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Q. Number of people over age 80 is

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Q. At cephalic end of primitive streak, closely packed cells form a local thickening known as

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Q. During elongation, cell volume increases due to

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Q. Study of growth and differentiation undergone by an animal from zygote into a highly complex individual is called

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Q. Hans Driesch in his experiment took egg of

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Q. During differentiation phase

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Q. Hans Driesch performed his experiment on sea urchin egg in

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Q. Study of aging is called

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Q. Salamander zygote was divided by spemann using

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Q. Cell volume during elongation increases up to

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Q. During elongation phase of growth

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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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