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Q. No.In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :
a.
secretion of secondary metabolites and their deposition in the lumen of vessels.
b.
deposition of organic compounds like tannins and resins in the central layers of stem.
c.
deposition of suberin and aromatic substances in the outer layer of stem.
d.
deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
e.
presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below
1. (b) and (d) Only
2. (a) and (b) Only
3. (c) and (d) Only
4. (d) and (e) Only
1. (b) and (d) Only
2. (a) and (b) Only
3. (c) and (d) Only
4. (d) and (e) Only
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The type of tissue commonly found in the fruit wall of nuts is :
| 1. | Parenchyma | 2. | Collenchyma |
| 3. | Sclerenchyma | 4. | Sclereid |
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
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Interfascicular cambium is present between:
1. Primary xylem and primary phloem
2. Pericycle and endodermis
3. Two vascular bundles
4. Secondary xylem and secondary phloem
1. Primary xylem and primary phloem
2. Pericycle and endodermis
3. Two vascular bundles
4. Secondary xylem and secondary phloem
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Read the following statements about the vascular bundles:
Choose the correct answer from the options given below:
1. (a), (c), (d) and (e) only
2. (a), (b) and (d) only
3. (b), (c), (d) and (e) only
4. all statements are correct
| a. | In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii. |
| b. | Conjoint closed vascular bundles do not possess cambium. |
| c. | In open vascular bundles, cambium is present in between xylem and phloem. |
| d. | The vascular bundles of dicotyledonous stem possess endarch protoxylem. |
| e. | In monocotyledonous root, usually there are more than six xylem bundles present. |
1. (a), (c), (d) and (e) only
2. (a), (b) and (d) only
3. (b), (c), (d) and (e) only
4. all statements are correct
Subtopic: Vascular Tissue System |
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Which of the following is/are a correct match?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | Bulliform cells | large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots. |
| II: | Lenticells | a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Monocot Leaf | Activity of Cork Cambium |
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Choose the incorrect statement related to the type of leaf anatomy shown below:
| 1. | Secondary growth may occur in later stages. |
| 2. | It depicts a dorsiventral leaf. |
| 3. | It shows more number of stomata towards the lower epidermis. |
| 4. | Secondary growth can never occur. |
Subtopic: Dicot Leaf |
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Which of the following statement is not true for stomatal apparatus?
| 1. | Guard cells invariably possess chloroplasts and mitochondria |
| 2. | Guard cells are always surrounded by subsidiary cells |
| 3. | Stomata are involved in gaseous exchange |
| 4. | Inner walls of guard cells are thick |
Subtopic: Epidermal Tissue System |
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Consider the following tissues in the stellar region of a stem showing secondary growth.
(A) Primary xylem
(B) Secondary xylem
(C) Primary phloem
(D) Secondary phloem
Arrange these in the correct sequence of their position from pith towards cortex.
(A) Primary xylem
(B) Secondary xylem
(C) Primary phloem
(D) Secondary phloem
Arrange these in the correct sequence of their position from pith towards cortex.
| 1. | (A), (B), (D), (C) | 2. | (B), (A), (C), (D) |
| 3. | (A), (B), (C), (D) | 4. | (B), (A), (D), (C) |
Subtopic: Dicot Stem |
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What is the number of correct statements from those given below?
| I: | Primary xylem is endarch in roots |
| II: | Phloem parenchyma is present in most of the monocots. |
| III: | Phloem fibers are generally absent in the primary phloem. |
| IV: | Companion cells are collenchymatous cells. |
| V: | Angiosperms lack vessels in their xylem. |
1. 0
2. 1
3. 2
4. 3
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
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Consider the given statements:
| I. | In dicot roots, the pericycle strengthens the roots and provides protection for the vascular bundles. |
| II. | In dicot root, the vascular cambium is completely secondary in origin, and it originates from a portion of pericycle tissue. |
| III. | The pericycle regulates the formation of lateral roots by rapidly dividing near the xylem elements of the root. |
The correct statements are:
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Anatomy of Root |
57%
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