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Natural environment

Related to any physical feature of the earth's natural environment.

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turgor pressure

Plants; Flowers

Force exerted outward on a cell wall by the water contained in the cell. This force gives the plant rigidity, and may help to keep it erect.

vegetative growth

Plants; Flowers

Growth of a plant by division of cells, without sexual reproduction.

venation

Biology; Flowers

The arrangement and pattern of veins in a leaf.

whorl

Plants; Flowers

An arrangement of appendages, such as branches or leaves, such that all are equally spaced around the stem at the same point, much like the spokes of a wheel or the ribs of an ...

xylem

Plants; Flowers

Water-conducting tissue of vascular plants.

adventitious roots

Plants; Flowers

A root that grows from somewhere other than the primary root, for example, roots that arise from stems or leaves.

alternation of generations

Plants; Flowers

Life cycle in which haploid and diploid generations alternate with each other.

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