Question:
Idetify the the crops with low "Light Compensation Point"
(A). Lettuce
(B). Soybean
(C). Betelvine
(D). Fingermillet
Choose the correct answer from the options given below:
Idetify the the crops with low "Light Compensation Point"
(A). Lettuce
(B). Soybean
(C). Betelvine
(D). Fingermillet
Choose the correct answer from the options given below:
(A). Lettuce
(B). Soybean
(C). Betelvine
(D). Fingermillet
Choose the correct answer from the options given below:
Show Hint
Shade-loving plants (sciophytes) have lower light compensation and saturation points than sun-loving plants (heliophytes), making them highly efficient at capturing limited light.
Updated On: Jul 13, 2026
- (B) and (D) only.
- (A) and (C) only.
- (D) only.
- (B) only.
Show Solution
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The light compensation point (LCP) is the light intensity at which the rate of photosynthetic $\text{CO}_2$ fixation matches the rate of respiratory $\text{CO}_2$ release.
At this point, net gas exchange between the plant and the atmosphere is zero.
Step 2: Detailed Explanation:
- Shade-tolerant plants (sciophytes) have adapted to thrive in low-light environments.
They maintain low respiration rates, which allows them to reach their light compensation point at very low light intensities.
- Betelvine (Piper betle) [C]: A shade-loving evergreen climber that is cultivated under protective shade structures (barejas).
It has an extremely low light compensation point, allowing it to maintain a positive carbon balance in deeply shaded conditions.
- Lettuce (Lactuca sativa) [A]: A cool-season, shade-tolerant leafy vegetable that also exhibits a low light compensation point compared to agronomic field crops.
- Soybean [B] and Fingermillet [D]: Heliophytes (sun-loving plants) with high photosynthetic and respiratory rates.
They require high light intensities to reach their compensation points and saturate their photosynthetic machinery.
Therefore, Lettuce and Betelvine are the crops characterized by low light compensation points.
Step 3: Final Answer:
The crops with a low light compensation point are Lettuce (A) and Betelvine (C).
The light compensation point (LCP) is the light intensity at which the rate of photosynthetic $\text{CO}_2$ fixation matches the rate of respiratory $\text{CO}_2$ release.
At this point, net gas exchange between the plant and the atmosphere is zero.
Step 2: Detailed Explanation:
- Shade-tolerant plants (sciophytes) have adapted to thrive in low-light environments.
They maintain low respiration rates, which allows them to reach their light compensation point at very low light intensities.
- Betelvine (Piper betle) [C]: A shade-loving evergreen climber that is cultivated under protective shade structures (barejas).
It has an extremely low light compensation point, allowing it to maintain a positive carbon balance in deeply shaded conditions.
- Lettuce (Lactuca sativa) [A]: A cool-season, shade-tolerant leafy vegetable that also exhibits a low light compensation point compared to agronomic field crops.
- Soybean [B] and Fingermillet [D]: Heliophytes (sun-loving plants) with high photosynthetic and respiratory rates.
They require high light intensities to reach their compensation points and saturate their photosynthetic machinery.
Therefore, Lettuce and Betelvine are the crops characterized by low light compensation points.
Step 3: Final Answer:
The crops with a low light compensation point are Lettuce (A) and Betelvine (C).
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