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C4 Plants Pathway Video Lecture | Biology Class 11 - NEET

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FAQs on C4 Plants Pathway Video Lecture - Biology Class 11 - NEET

1. What is the C4 pathway in plants?
Ans. The C4 pathway is a photosynthetic pathway found in certain plants, where they have developed a mechanism to efficiently fix carbon dioxide. This pathway allows plants to minimize the effects of photorespiration and enhance their growth in hot and dry environments.
2. How does the C4 pathway differ from the C3 pathway?
Ans. The C4 pathway differs from the C3 pathway in terms of carbon fixation and spatial separation of biochemical reactions. While C3 plants fix carbon dioxide directly through the Calvin cycle in mesophyll cells, C4 plants initially fix carbon dioxide into a 4-carbon compound in specialized cells called bundle sheath cells. This spatial separation allows C4 plants to concentrate carbon dioxide and minimize photorespiration.
3. Which plants utilize the C4 pathway?
Ans. Various plants have evolved to utilize the C4 pathway for photosynthesis, including maize, sugarcane, sorghum, and certain species of grasses. These plants are commonly found in warm and dry regions, where the C4 pathway provides them with an advantage in efficiently utilizing carbon dioxide and conserving water.
4. How does the C4 pathway contribute to plant adaptation in hot environments?
Ans. The C4 pathway contributes to plant adaptation in hot environments by minimizing water loss through stomatal closure. As C4 plants can efficiently fix carbon dioxide even at low concentrations, they can keep their stomata partially closed, reducing water loss through transpiration. This adaptation allows C4 plants to thrive in hot and arid conditions.
5. What are the advantages of the C4 pathway over the C3 pathway?
Ans. The C4 pathway provides several advantages over the C3 pathway. It allows plants to thrive in hot and dry environments by minimizing photorespiration, enhancing water-use efficiency, and maintaining higher rates of photosynthesis. C4 plants also have an advantage in higher temperatures due to their ability to concentrate carbon dioxide in bundle sheath cells. Overall, the C4 pathway provides plants with improved adaptation and growth in challenging environmental conditions.
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