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PYQs/Biology/Secondary Growth

Biology2018easy

Secondary Growth

Secondary xylem and phloem in dicot stem are produced by

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Secondary Growth

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Plants having little or no secondary growth are

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Formation of interfascicular cambium from fully developed parenchyma cells is an example for

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Late wood has fewer xylary elements with narrow vessels. Reason R: Cambium is less active in winters. In the light of the above statements, choose the correct answer from the options given below:

In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to: (a) Secretion of secondary metabolites and their deposition in the lumen of vessels. (b) Deposition of organic compounds like tannins and resins in the central layers of the stem. (c) Deposition of suberin and aromatic substances in the outer layer of the stem. (d) Deposition of tannins, gum, resin and aromatic substances in the peripheral layers of the stem. (e) Presence of parenchyma cells, functionally active xylem elements and essential oils. Choose the correct answer from the options given below:

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