- 1(current)
Q. No.Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :
1. Tyloses in vessels
2. Closure of stomata
3. Flaccidity of bulliform cells
4. Shrinkage of air spaces in spongy mesophyll
| 1. | A - Adaxial epidermis | 2. | B - Phloem |
| 3. | C - Mesophyll | 4. | D - Abaxial epidermis |
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) |
Regarding the guard cells:
1. walls away from the stomatal pores are thin and those towards the stomatal pores are thick
2. walls away from the stomatal pores are thick and those towards the stomatal pores are thin
3. chloroplasts are mostly absent
4. play no role in the regulation of opening and closing of stomata
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- 1(current)
Q. No.
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