3. The autotrophic mode of nutrition requires (a) carbon dioxide and water. (b) chlorophyll. (c) sunlight. (d) all of the above.
The autotrophic mode of nutrition requires:
- (d) all of the above.
- Explanation: Plants need carbon dioxide and water, chlorophyll (the green stuff in leaves), and sunlight to make their food through a process called photosynthesis. So, they need all three to grow and produce energy.
The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in:
- (b) mitochondria.
Explanation: Mitochondria are like tiny power plants in cells. They take pyruvate, a molecule from food, and break it down to release energy, carbon dioxide, and water. This process helps cells do their work.
