NEET Solved Paper 2016 Question 53
Question: A plant in your garden avoids photo respiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
Options:
A) $ C _3 $
B) $ C _4 $
C) $ CAM $
D) Nitrogen fixer
Show Answer
Answer:
Correct Answer: B
Solution:
- Avoids photorespiratory losses: C4 plants have a mechanism to concentrate CO2 in the bundle sheath cells, which reduces the oxygenation activity of Rubisco and thus minimizes photorespiration.
- Improved water use efficiency: C4 plants typically have better water use efficiency because they can maintain high photosynthetic rates with their stomata partially closed, reducing water loss.
- High rates of photosynthesis at high temperatures: C4 plants are adapted to high temperatures and can maintain high photosynthetic rates even under such conditions.
- Improved efficiency of nitrogen utilization: C4 plants often have a more efficient use of nitrogen because they require less Rubisco enzyme compared to C3 plants.
Given these characteristics, the plant would be assigned to the physiological group of C4 plants.
BETA
