NEET Biology question
Which of the following statements are true? I. Uneven thickening of cell wall is characteristic of sclerenchyma. II. Periblem forms the cortex of the stem and the root. III. Tracheids are the chief water transporting elements in gymnosperms. IV. Companion cell is devoid of nucleus at maturity. V. The commercial cork is obtained from Quercus suber.
Solution
Statement I is false because uneven (unevenly thickened) walls are characteristic of collenchyma, not sclerenchyma (which has uniform thickening). Statement II is true: periblem, the middle histogen layer, gives rise to the cortex of both root and stem. Statement III is true: gymnosperms lack vessels (except a few
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