primary root

American  

noun

Botany.

1. the first root produced by a germinating seed, developing from the radicle of the embryo.

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primary root Scientific  

1. The first root of a plant, originating in the embryo. In gymnosperms, eudicotyledons, and magnoliids, the primary root develops into the taproot. In monocotyledons, the primary root disintegrates as the lateral roots develop into a system of fibrous roots.

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Etymology

Origin of primary root

First recorded in 1885–90

Example Sentences

See Examples For:

primary root

In many Dicotyledons and most Monocotyledons, the primary root soon perishes, and its place is taken by adventitious roots developed from the stem.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various

Inasmuch as the growth of the primary root is soon overtaken by other roots growing from the stem, all the roots happen to be of the same size.

From A Handbook of Some South Indian Grasses by K. Rangachari

The root which first forms when the seed bursts is known as the primary root.

From Dry-Farming : a System of Agriculture for Countries under a Low Rainfall by John Andreas Widtsoe

When the primary root grows more rapidly than the secondary roots, the so-called taproot, characteristic of lucerne, clover, and similar plants, is formed.

From Dry-Farming : a System of Agriculture for Countries under a Low Rainfall by John Andreas Widtsoe

From this primary root other roots develop, which are known as secondary roots.

From Dry-Farming : a System of Agriculture for Countries under a Low Rainfall by John Andreas Widtsoe