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Q. No.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 |
From NCERT
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Trichomes in stems can perform all the following functions except:
| 1. | Generate secretory products to cause sting. |
| 2. | Reduce herbivory. |
| 3. | Bring about greater water loss through extended surface area of the epidermis. |
| 4. | Provide shade. |
Subtopic: Epidermal Tissue System |
67%
From NCERT
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The characteristic distribution of vascular bundles in the T.S. shown below tells us that the T.S. must be of a:
1. Monocot stem
2. Dicot stem
3. Monocot root
4. Dicot root
1. Monocot stem
2. Dicot stem
3. Monocot root
4. Dicot root
Subtopic: Monocot Stem |
88%
From NCERT
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Bulliform cells found in adaxial epidermis in grasses:
| 1. | enable the leaf to fold. |
| 2. | are found in the endodermis. |
| 3. | are highly photosynthetic. |
| 4. | are characteristic of xeromorphic plants. |
Subtopic: Monocot Leaf |
81%
From NCERT
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The development of the root primary xylem is said to be:
1. Exarch
2. Endarch
3. Centrifugal
4. Diffuse
1. Exarch
2. Endarch
3. Centrifugal
4. Diffuse
Subtopic: Complex Tissue: Xylem |
87%
From NCERT
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In the vascular bundle of a typical monocot such as corn, the structure that is most likely absent will be:
| 1. | Metaxylem | 2. | Cambium |
| 3. | Protoxylem lacuna | 4. | Metaphloem |
Subtopic: Vascular Tissue System |
91%
From NCERT
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In a dorsiventral [dicot] leaf, the vascular bindles present in the midrib are:
| 1. | smallest in size |
| 2. | largest in size |
| 3. | equal in size to others |
| 4. | radial |
Subtopic: Dicot Leaf |
74%
From NCERT
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The transverse section of a dicot root is unlikely to show the presence of a conspicuous:
1. cortex
2. pericycle
3. pith
4. endodermis
1. cortex
2. pericycle
3. pith
4. endodermis
Subtopic: Dicot Leaf |
82%
From NCERT
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In a dicot stem, the term ‘starch sheath’ is often used to indicate:
1. The hypodermis
2. The endodermis
3. The pericycle
4. The medullary rays
1. The hypodermis
2. The endodermis
3. The pericycle
4. The medullary rays
Subtopic: Dicot Stem |
78%
From NCERT
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Identify the correct statements:
| I: | Guard cells are dumbbell shaped in dicots |
| II: | Initiation of lateral roots and vascular cambium during the secondary growth takes place in pericycle cells in dicot roots. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Anatomy of Root |
78%
From NCERT
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