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Some structures are given below. How man...

Some structures are given below. How many of them are modifications of stem? Rhizome of turmeric, Bulb of onion, insectivorous pitcher of Nepenthes, Potato tubers, tubers of sweet potato, Tendrils of Pisum sativum,

A

Four

B

Three

C

Five

D

Six

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the given structures are modifications of the stem, we will analyze each structure one by one. ### Step-by-Step Solution: 1. **Rhizome of Turmeric**: - A rhizome is a type of underground stem that grows horizontally. It serves as a storage organ and a means of vegetative reproduction. - **Conclusion**: This is a modification of the stem. 2. **Bulb of Onion**: - An onion bulb is a modified stem that is surrounded by fleshy leaf scales. It is also an underground storage organ. - **Conclusion**: This is a modification of the stem. 3. **Insectivorous Pitcher of Nepenthes**: - The pitcher of Nepenthes is a modified leaf that has evolved to trap insects. However, it is not a stem modification. - **Conclusion**: This is NOT a modification of the stem. 4. **Potato Tubers**: - Potato tubers are swollen underground stems that store nutrients and have axillary buds. - **Conclusion**: This is a modification of the stem. 5. **Tubers of Sweet Potato**: - Sweet potato tubers are actually modified roots that store food. They do not originate from the stem. - **Conclusion**: This is NOT a modification of the stem. 6. **Tendrils of Pisum sativum**: - Tendrils are modified stems that help the plant climb. They are thread-like structures that coil around supports. - **Conclusion**: This is a modification of the stem. ### Summary of Findings: - Modifications of Stem: - Rhizome of Turmeric - Bulb of Onion - Potato Tubers - Tendrils of Pisum sativum - Not Modifications of Stem: - Insectivorous Pitcher of Nepenthes (leaf modification) - Tubers of Sweet Potato (root modification) ### Final Count: Out of the six structures, **four** are modifications of the stem. ### Answer: **4 modifications of stem**. ---
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