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Secondary Growth in Stem

The annular a...

Question

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

A

maturing

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B

elongating

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C

widening

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D

differentiating

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Solution

The correct option is A
maturing

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is maturing.

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The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

Q. The annular and spirally thickened conducting elements generally develop in the protoxylem, when the stem is

Q. Which ones are correct
(a) Uneven thickening of cell wall is characteristic of sclerenchyma
(b) Periblem forms cortex of stem and root
(c) Tracheids are chief water conducting elements in gymnosperms
(d) Companion cell is devoid of nucleus at maturity
(e) Commercial cork is obtained from Quercus suber

What kind of thickening is seen in protoxylem?

Q. Which of the following statements is/are true?
I. Protoxylem and metaxylem is found in secondary xylem
II. In exarch condition, the protoxylem is towards the periphery
III. Tracheids are the chief water transporting elements in gymnosperms
IV. Companion cell is devoid of the nucleus at maturity

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