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Activity of meristem to form new cells is open form of growth

Increase in the amount of protoplasm of a cell as seen during interphase of cell cycle is closed form of growth.

Ability of the plant to produce new plant material is called as efficiency index.

Gravity does not show any influence on plant growth

answer is D.

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Detailed Solution

Gravity influences the growth of plant axis mediated by auxins. Growth of roots is usually towards the gravity and described as positively geotropic and that of shoot is away from the gravity described as negatively geotropic.

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