MCQ'S: Anatomy of Flowering plants By: Aprajita shankhdhar 46 76
1. Axillary bud and terminal bud derived from the activity of .(a) lateral meristem .(b) intercalary meristem .(c) apical meristem (d) parenchyma.
2. Which of the following statement is true: . (a) vessels are multicellular with wide lumen . (b) tracheids are multicellular with narrow lumern . (c) vessels are unicellular with narrow lumen . (d) tracheids are unicellular with wide lumen.
3. The cells of the quiescent centre are characterised by (a) having dense cytoplasm and prominent nuclei .(b) having light cytoplasm and small nuclei .(c) dividing regularly to add tothe corpus .(d) dividing regularly to add to tunica (2003)
4 Diffuse porous woods are characteristic of plants growing in .(a) alpine region .(b) cold winter regions .(c) temperature climate (d) tropics
. Chlorenchyma is known to develop in the (a) cytoplasm of Chlorella . (b) mycelium of a green mould such as Aspergillus (c) spore capsule of a moss . (d) pollen tube of Pinus
6. Closed vascular bundles lack A. ground tissue B. conjunctive tissue C. cambium D. pith
1. .c): Apical meristems are situated at the tips of the root and shoot. They take part in initial growth Plants elongate and increase in height as a result of divisions in this meristem. Promeristem and primary meristem (root and sh'">t apices) are included in this type of meristem.
2 .(d): Xylem is the principal water conducting tissue of the plant. It consists of four types of cells-tracheids, vessels, xylem Fibres and xylem parenchyma. The tracheids and vessels together are known as tracheary elements. Tracheids are characteristic of all vascular plant. Tracheids originate from single cells. These are single elongated cells with tapering ends. The end walls are without perforations. Their length varies from 1 to 3 mm. Tracheids are devoid of protoplast, hence dead; fairly large cavity of these cells is without any contents. The wall of tracheids is moderately thick and usually lignified
*b): In the apices of some roots, (e.g., Zea mays, maize), there is a central region of cells which normally does not divide. This central inactive region was called quiescent centre by FA.L. Clowes (1959, 1961). The cells of this region have lesser amounts of RNA and DNA' so they have small nuclei. *These cells also have a lower rate of protein synthesis. Mitochondria and endoplasmic reticulum are less developed The cells of the quiescent centre are usually inactive. However, if already existing meristematic cells are injured or become inactive due to any other reason, the cells of quiescent centre become active.
5. . (c): Chlorenchyma or assimilatory parenchyma are parenchymatous cells that possess abundant chioroplasts in them. They are capable of photosynthesis. A spore capsule of moss can perform photosynthesis because of the presence of chlorenchyma cells in them.
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