Question:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: High rainfall and long photoperiod promote vine growth and reduce the tuber yield of sweet potato.
Reason R: Temperature less than 25 $^\circ$C was found critical for tuberization in sweet potato.
In light of the above statements, choose the correct answer from the options given below:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: High rainfall and long photoperiod promote vine growth and reduce the tuber yield of sweet potato.
Reason R: Temperature less than 25 $^\circ$C was found critical for tuberization in sweet potato.
In light of the above statements, choose the correct answer from the options given below:
Assertion A: High rainfall and long photoperiod promote vine growth and reduce the tuber yield of sweet potato.
Reason R: Temperature less than 25 $^\circ$C was found critical for tuberization in sweet potato.
In light of the above statements, choose the correct answer from the options given below:
Show Hint
In sweet potato:
Long days + High rainfall $\rightarrow$ Promote vine growth over tuber growth.
Cool temperatures ($< 25^\circ\text{C}$) $\rightarrow$ Promote storage root initiation (tuberization).
Long days + High rainfall $\rightarrow$ Promote vine growth over tuber growth.
Cool temperatures ($< 25^\circ\text{C}$) $\rightarrow$ Promote storage root initiation (tuberization).
Updated On: Aug 7, 2026
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is NOT the correct explanation of A
- A is correct but R is not correct
- A is not correct but R is correct
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Sweet potato (Ipomoea batatas) is a root crop whose yield depends on the balance between vegetative growth (vine development) and storage root development (tuberization).
This balance is regulated by environmental factors, including temperature, photoperiod, and moisture.
Step 2: Detailed Explanation:
Assertion A is correct.
High rainfall and long day conditions (long photoperiods) stimulate gibberellin synthesis in sweet potato plants.
This hormonal balance promotes rapid vegetative shoot growth (vines) at the expense of storage root development, which reduces tuber yield.
Reason R is also correct.
Tuber initiation and growth (tuberization) require cool to moderate temperatures.
Research indicates that temperatures below $25^\circ\text{C}$ (ideally $20^\circ\text{C}$ to $22^\circ\text{C}$) are critical for initiating and expanding storage roots.
While both statements are factually correct, the primary cause of excessive vine growth and reduced tuber yield under long photoperiods and high rainfall is hormonal partitioning, not the critical temperature limit of $25^\circ\text{C}$.
Therefore, Reason R is not the direct explanation for Assertion A.
Step 3: Final Answer:
Both Assertion A and Reason R are correct, but Reason R is not the correct explanation of Assertion A, which corresponds to Option (B).
Sweet potato (Ipomoea batatas) is a root crop whose yield depends on the balance between vegetative growth (vine development) and storage root development (tuberization).
This balance is regulated by environmental factors, including temperature, photoperiod, and moisture.
Step 2: Detailed Explanation:
Assertion A is correct.
High rainfall and long day conditions (long photoperiods) stimulate gibberellin synthesis in sweet potato plants.
This hormonal balance promotes rapid vegetative shoot growth (vines) at the expense of storage root development, which reduces tuber yield.
Reason R is also correct.
Tuber initiation and growth (tuberization) require cool to moderate temperatures.
Research indicates that temperatures below $25^\circ\text{C}$ (ideally $20^\circ\text{C}$ to $22^\circ\text{C}$) are critical for initiating and expanding storage roots.
While both statements are factually correct, the primary cause of excessive vine growth and reduced tuber yield under long photoperiods and high rainfall is hormonal partitioning, not the critical temperature limit of $25^\circ\text{C}$.
Therefore, Reason R is not the direct explanation for Assertion A.
Step 3: Final Answer:
Both Assertion A and Reason R are correct, but Reason R is not the correct explanation of Assertion A, which corresponds to Option (B).
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