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Q. No.Water-impermeable layer in dicot roots is
1.
Sclerenchymatous in nature
2.
Innermost layer of cortex
3.
Occupy the central portion
4.
Present just below pericycle
Subtopic: Anatomy of Root |
70%
Level 2: 60%+
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The transverse section of a plant shows following anatomical features
Identify the category of plants and its parts
| a. | Sclerenchymatous hypodermis |
| b. | Scattered vascular bundles with peripheral smaller than centrally located ones |
| c. | Water-containing cavities present within the vascular bundles |
Identify the category of plants and its parts
| 1. | Monocotyledonous stem |
| 2. | Dicotyledonous root |
| 3. | Monocotyledonous root |
| 4. | Dicotyledonous stem |
Subtopic: Dicot Stem |
80%
Level 1: 80%+
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The extrastelar cambium in dicot stem forms all of the following cells, except
| 1. | Epidermal cells |
| 2. | Cork cells |
| 3. | Cortical cells |
| 4. | Complementary cells |
Subtopic: Anatomy of Root |
54%
Level 3: 35%-60%
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Select correct statements with respect to bulliform cells
| a. | Modified abaxial epidermal cells |
| b. | Large, empty, colourless cells |
| c. | Photosynthetic contain chloroplast |
| d. | Make the leaves curl inwards during water stress conditions |
| e. | Help to minimise water loss |
| 1. | Only a, b and c |
| 2. | Only a, c and e |
| 3. | Only b , d and e |
| 4. | All a, b, c, d and e |
Subtopic: Dicot Leaf | Monocot Leaf |
78%
Level 2: 60%+
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Which of the following are produced by vascular cambium?
| 1. | Secondary xylem and secondary cortex |
| 2. | Secondary phloem and cork cells |
| 3. | Secondary medullary rays and secondary cortex |
| 4. | Secondary medullary rays, secondary xylem and secondary phloem |
79%
Level 2: 60%+
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Identify wrong w.r.t. peripherally located younger areas of secondary xylem
1. Formed during both spring and autumn seasons
2. Also Known as early wood
3. Lighter in colour
4. Involved in the conduction of water and minerals
1. Formed during both spring and autumn seasons
2. Also Known as early wood
3. Lighter in colour
4. Involved in the conduction of water and minerals
Level 3: 35%-60%
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Which of the following statements is incorrect?
| 1. | Spring wood is lighter in colour with large number of xylary elements having vessels with wider cavities |
| 2. | Autumn wood is darker with lower density and formed due to less activity of cambium |
| 3. | Alternate concentric rings of autumn wood and spring wood, constitute an annual ring |
| 4. | Annual rings seen in a cut stem give an estimate of the age of the tree |
82%
Level 1: 80%+
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Secondary growth in cortical region is due to phellogen which is
| 1. | Partly primary and partly secondary in origin |
| 2. | Secondary meristematic tissue formed due to dedifferentiation of cells of cortex |
| 3. | Involved in production of phelloderm impervious to water |
| 4. | Primary meristem responsible for formation of cork cells and secondary cortex |
Subtopic: Activity of Cork Cambium |
77%
Level 2: 60%+
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Annual rings that are formed due to secondary growth are clearly seen in
1. Roots of aquatic plants
2. Stem of trees in tropical region
3. Both roots and stem of trees in tropical region
4. Stem of trees in temperate regions
1. Roots of aquatic plants
2. Stem of trees in tropical region
3. Both roots and stem of trees in tropical region
4. Stem of trees in temperate regions
72%
Level 2: 60%+
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Identify the correct statements and choose the option accordingly
1. a and d only
2. a, b and c
3. c and d only
4. b and c only
| a. | In dicot roots, pericycle is completely transformed into vascular cambium |
| b. | Lenticels regulate the transpiration rate in woody trees |
| c. | Bark in a tree does not include the vascular cambium |
| d. | Cork is impervious to water due to suberin deposition in the cell wall |
1. a and d only
2. a, b and c
3. c and d only
4. b and c only
Subtopic: Activity of Cork Cambium |
55%
Level 3: 35%-60%
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