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During water stress, the bulliform cells...

During water stress, the bulliform cells
(a) Become turgid
(b) Become flaccid
(c ) Make the leaves curl inwards
(d) Make the leaf surface exposed
The correct options are

A

(a) and ( c)

B

(b) and (d)

C

(a) and (d)

D

(b) and (c )

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the behavior of bulliform cells during water stress, we can break it down into the following steps: ### Step-by-Step Solution: 1. **Understanding Bulliform Cells**: - Bulliform cells are specialized cells found in the upper epidermis of monocotyledonous leaves. They play a crucial role in the plant's response to water availability. **Hint**: Remember that bulliform cells are unique to monocots and are involved in leaf movement. 2. **Function During Water Stress**: - During periods of water stress (when water is scarce), these cells respond to help the plant conserve water. They do this by changing their turgidity. **Hint**: Think about how plants adapt to conserve water when they are not getting enough. 3. **Turgidity Changes**: - When water is plentiful, bulliform cells are turgid (swollen with water), which helps keep the leaves expanded. However, during water stress, these cells become flaccid (less swollen). **Hint**: Turgid means full of water, while flaccid means lacking water. 4. **Leaf Curling Mechanism**: - As bulliform cells become flaccid, they cause the leaves to curl inwards. This curling reduces the surface area exposed to the sun and air, thereby minimizing water loss through transpiration. **Hint**: Consider how curling leaves might help reduce water loss. 5. **Evaluating the Options**: - Now, let's evaluate the provided options: - (a) Become turgid - **Incorrect** (they become flaccid during water stress). - (b) Become flaccid - **Correct** (this is what happens during water stress). - (c) Make the leaves curl inwards - **Correct** (this is a direct result of becoming flaccid). - (d) Make the leaf surface exposed - **Incorrect** (they actually reduce exposure to conserve water). 6. **Conclusion**: - The correct options are (b) and (c). Therefore, the answer to the question is that bulliform cells become flaccid and make the leaves curl inwards during water stress. ### Final Answer: The correct options are (b) Become flaccid and (c) Make the leaves curl inwards.
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