Q. No.While looking at a T.S. of a certain plant part you are convinced that it must be a monocot stem. Which of the following, if seen in the T.S. will give you confidence for your conclusion?
1.
Conjoint vascular bundles
2.
Presence of a hypodermis
3.
Presence of phloem parenchyma
4.
Presence of water containing cavities within the vascular bundles
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Regarding the epidermal tissue system of angiosperms:
| I: | Cuticle is absent in roots |
| II: | Guard cells are dumb-bell shaped in grasses and possess chloroplasts |
| III: | Root hairs are multicellular and the stem hairs are unicellular |
1. Only I is correct
2. Only I and II are correct
3. Only II is correct
4. Only II and III are correct
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Gymnosperms lack:
I. vessels in their xylem
II. sieve tubes and companion cells
III. secondary growth
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II, and III
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Statement I: ‘Tissue’ is a level of biological organization between cells and a complete organ.
Statement II: A tissue is a group of cells having a common origin and usually performing a common function.
1. Statement I is correct and Statement II is incorrect
2. Statement I is Statement II are correct
3. Statement I is Statement II are incorrect
4. Statement I is incorrect and Statement II is correct
| I: | is constituted by some cells ‘left behind’ from shoot apical meristem during the formation of leaves and elongation of stems. |
| II: | is present in the axils of leaves and is capable of forming a branch or a flower. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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| Character | Dicot[Dorsiventral] | Monocot [Isobilateral] | |
| 1. | Presence of stomata | More on adaxial epidermis | More on abaxial epidermis |
| 2. | Mesophyll | Differentiated into palisade and spongy parenchyma | Not differentiated into palisade and spongy parenchyma |
| 3. | Venation | Mostly reticulate | Mostly parallel |
| 4. | Size of vascular bundle | Dependent on the size of veins | Near similar size except in main veins |
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1. they are certain adaxial epidermal cells that when flaccid make the leaves curl inwards
2. they are certain abaxial epidermal cells that when flaccid make the leaves curl inwards
3. they are certain adaxial epidermal cells that when turgid make the leaves curl inwards
4. they are certain abaxial epidermal cells that when turgid make the leaves curl inwards
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| 1. | wide variations in size of vascular bundles in the main veins |
| 2. | wide variations in size of vascular bundles except in the main veins |
| 3. | near similar size of vascular bundles in the main veins |
| 4. | near similar size of vascular bundles except in the main veins |
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1. occurs in all angiosperms
2. is accomplished by the procambium
3. is accomplished, at least in part, by the vascular cambium
4. brings about an increase in the height of the plant
| 1. pericycle | 2. medullary rays |
| 3. endodermis | 4. hypodermis |
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