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Q. No.What are the distinctive features of collenchyma cells?
| 1. | They are elongated cells with thickened lignified cell walls. |
| 2. | They are dead cells that provide structural support. |
| 3. | They are elongated cells with unevenly thickened non-lignified cell walls. |
| 4. | They contain chloroplasts and primarily function in storage. |
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
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Collenchyma cells are characterized by:
| 1. | Uniformly thickened non-lignified cell walls |
| 2. | Thickened corners with a high concentration of cellulose and pectin |
| 3. | Lignified cell walls |
| 4. | Being dead and providing mechanical support only |
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
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In dicot stems, why are collenchyma tissues generally found beneath the epidermis?
| 1. | To provide flexibility and mechanical support to the stem. |
| 2. | To facilitate gaseous exchange through the stem. |
| 3. | To conduct water and nutrients from the roots. |
| 4. | To store food and nutrients for the stem. |
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
93%
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During the formation of primary plant body, dermal tissue, ground tissue and vascular tissue are produced by:
1. Primary meristems
2. Secondary meristems
3. Both primary and secondary meristems
4. Neither primary nor secondary meristems
Subtopic: Ground Tissue System |
73%
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What would be the best description of stomata?
| 1. | two guard cells plus the subsidiary cells only. |
| 2. | an opening surrounded by two guard cells. |
| 3. | an opening surrounded by two guard cells and the subsidiary cells. |
| 4. | two guard cells only. |
Subtopic: Epidermal Tissue System |
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Guard cells:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Lack chloroplasts. |
| II: | Are dumb-bell shaped in grasses. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Epidermal Tissue System |
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Which of the following statements about the epidermal tissue system is TRUE?
| 1. | It is composed mainly of collenchyma cells. |
| 2. | Guard cells are absent in the epidermal tissue. |
| 3. | The epidermal tissue system is responsible for photosynthesis. |
| 4. | It forms the outermost covering of the plant body and offers protection. |
Subtopic: Epidermal Tissue System |
88%
From NCERT
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Identify the incorrect statement:
| 1. | In grasses, the guard cells are dumb-bell shaped. |
| 2. | Trichomes in the shoot system are generally unicellular. |
| 3. | Casparian strips are associated with endodermis in dicot roots. |
| 4. | Endodermis in dicot stem is referred to as starch sheath. |
Subtopic: Epidermal Tissue System |
88%
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Identify the incorrect statement:
| 1. | In dicot root, initiation of lateral roots and vascular cambium during the secondary growth takes place in the pericycle |
| 2. | In monocot roots xylem bundles are usually more than six [polyarch] |
| 3. | In dicot stems vascular bundles are arranged in a ring |
| 4. | Monocot stem has a parenchymatous hypodermis |
Subtopic: Monocot Stem |
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Identify the incorrect comparison between monocots and dicots in general:
| Character | Monocots | Dicots | |
| 1. | Leaves | Parallel venation | Reticulate venation |
| 2. | Roots | Primary root of short duration, replaced by adventitial roots forming fibrous or fleshy root systems | Develops from the radicle. Primary root often persists forming strong tap roots and secondary roots |
| 3. | Plant stem: Vascular bundles | Ring of primary bundles with cambium, differentiated into cortex and stele | Numerous scattered bundles in ground parenchyma, cambium mostly absent, no differentiation between cortical and stelar regions |
| 4. | Flowers | Parts in threes (trimerous) or multiples of three | Fours (tetramerous) or fives (pentamerous) |
Subtopic: Anatomy of Root | Dicot Stem | Monocot Stem | Dicot Leaf | Monocot Leaf |
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