Which of the following statements is false regarding auxins? a. auxins are plant hormones c. auxins promote cell elongation in the stems b. auxins are produced by growing stem tips d. auxins promote the growth in the main system of the roots

Ans. (d). auxins promote the growth in the main system of the roots.

Auxin is a plant hormone, that plays role in shoot elongation, cell division, cell differentiation and is associated with regulation of plant growth. It is synthesized at the tips of growing stems. auxin promotes cell elongation by loosing of cell walls.

In lower concentration, auxin promotes root growth, but in high concentration, it inhibits primary root elongation and leads to adventitious or secondary root formation.

Thus, the correct answer is option (d).

The false statement regarding auxins promote the growth in the system of the roots.

Further Explanation:

The plant hormones are of five types;

The amino acid tryptophan gives a plant hormone which is auxin. An auxin helps in cellular regulation. Auxin is one of the major plant hormones. They are present in all tissues in a plant. They are produced at the tips of growing stems. However, they have been inclined in more concentration in the meristems which is a growth region of the plant. This region secret auxin molecule then circulated towards the roots. In this manner, the plant can synchronize its growth, size and development of different tissues depend upon the gradient of the auxin concentration.

Auxin plays a major role in:

In lower concentration, auxin promotes root growth, but in high concentration, it slows downs the primary root elongation and leads to secondary root formation.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Plant hormone

Keywords:

Root, auxin, elongation, plant, tryptophan, gibberellin, cytokinin, abscisic acid, ethylene, cellular regulation, growth.

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