| 1. | Which gas is necessary for photosynthesis? |
A. O₂ | |
B. CO | |
C. N₂ | |
D. CO₂ |
| 2. | The process of preparing plant and tree food is called – |
A. carbohydrolysis | |
B. metabolic synthesis | |
C. photosensitization | |
D. photosynthesis |
| 3. | Which forphyrin is present in chlorophyll? |
A. magnesium | |
B. calcium | |
C. Iron | |
D. tin |
| 4. | Where does most of the photosynthetic activity take place? |
A. in the blue and red regions of light | |
B. in the green and yellow regions of light | |
C. in the blue and orange regions of light | |
D. in the violet and orange regions of light |
| 5. | The end product of photosynthesis is – |
A. carbohydrates | |
B. carbon dioxide | |
C. oxygen | |
D. water |
| 6. | By which of the following energy transformations is the process of photosynthesis accomplished? |
A. chemical energy from light | |
B. heat energy of light | |
C. heat to biochemical energy | |
D. thermal kinetic energy |
| 7. | The role of chlorophyll in photosynthesis is – |
A. water absorption | |
B. absorption of light | |
C. absorption of carbon dioxide | |
D. None of these |
| 8. | Which gas is absorbed by plants during photosynthesis? |
A. carbon dioxide | |
B. oxygen | |
C. Nitrogen | |
D. hydrogen |
| 9. | Which gas is released by green plants during photosynthesis? |
A. oxygen | |
B. nitrogen | |
C. water vapour | |
D. carbon dioxide |
| 10. | What is the name of the gas released during photosynthesis? |
A. carbon dioxide | |
B. oxygen | |
C. nitrogen | |
D. hydrogen |