In a tropical rain forest, non-epiphytic ferns and allies occur as

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In spite of the removal of carbondioxide from the atmosphere, its amount remains more or less constant because

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The depth of illumination in a water body can be measured with a

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Which of the following ions is involved in the conduction of the nerve impulse?

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The gland directly affecting metabolic rate, growth and development is known as

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The process of walking is under the control of the part of the brain called

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Biological growth refers strictly to an increase in the

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The sex of a foetus is determined during

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The term caryopsis is used to describe a fruit in which the

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When a healthy shoot of a flowering plant is illuminated from one side, auxins, accumulate on the

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During the bending of the arm, the biceps muscles

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The excretory structure in the earthworm is the

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