Question:
Read the following statements and select the correct ones.
(i) Phloem parenchyma is absent in most monocots.
(ii) Gymnosperms lack tracheids and vessels.
(iii) Gymnosperms lack companion cells.
Read the following statements and select the correct ones.
(i) Phloem parenchyma is absent in most monocots.
(ii) Gymnosperms lack tracheids and vessels.
(iii) Gymnosperms lack companion cells.
Updated On: Jul 7, 2022
- (i) and (ii)
- (ii) and (iii)
- (i) and (iii)
- (i), (ii) and (iii)
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The Correct Option is C
Solution and Explanation
Phloem parenchyma is absent in most of the monocots and some herbaceous dicots. Gymnosperms lack companion cells, instead they possess albuminous cells. Gynmosperms lack vessels (except Gnetum etc.) but possess tracheids. Infact, tracheids constitute $90-95\%$ of wood in gymnosperms.
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Concepts Used:
Gymnosperms
Gymnosperms are flowerless plants that produce cones and seeds. It literally means "naked seed". They sit exposed on the surface of leaf-like structures called bracts. Gymnosperms are vascular plants of the subkingdom Embyophyta and include conifers, cycads, ginkgoes, and gnetophytes. They are abundant in temperate forest and boreal forest biomes with species that can tolerate moist or dry conditions.
Characteristics of Gymnosperms
- They do not produce flowers.
- Seeds are not formed inside a fruit.
- They are found in colder regions where snowfall occurs.
- They form cones with reproductive structures.
- Xylem does not have vessels and the phloem and it has no companion cells and sieve tubes.