| 11. | One of the processes occurring in plants, which can reduce their temperature, is – |
A. Photosynthesis | |
B. transpiration | |
C. water decomposition | |
D. breathing |
| 12. | Which process results in the release of oxygen and the absorption of carbon dioxide in plants? |
A. Photosynthesis | |
B. transpiration | |
C. osmosis | |
D. diffusion |
| 13. | It is needed for photosynthesis – |
A. water | |
B. deciduous | |
C. Sunlight | |
D. all of the above |
| 14. | What comes out in the process of photosynthesis? |
A. hydrogen | |
B. carbon dioxide | |
C. oxygen | |
D. chlorine |
| 15. | Which of the following statement is false? |
A. Photosynthesis takes place in sunlight | |
B. Carbon dioxide is used in photosynthesis | |
C. O₂ is used in photosynthesis | |
D. O₂ is released in photosynthesis. |
| 16. | The first step in the process of photosynthesis is – |
A. carbon dioxide fixation | |
B. stimulation of chlorophyll by sunlight | |
C. deoxygenation of water | |
D. formation of carbohydrates |
| 17. | The rate of photosynthesis is highest in – |
A. in purple light | |
B. in green light | |
C. in blue light | |
D. in red light |
| 18. | Which has the lowest rate of photosynthesis? |
A. in red light | |
B. in blue light | |
C. in purple light | |
D. in green light |
| 19. | Which of the following is the green colored substance which carries out photosynthesis in plants? |
A. chlorophyll | |
B. chloroplast | |
C. chloroform | |
D. none of these |
| 20. | Photosynthesis takes place – |
A. in the night | |
B. day and night | |
C. day or night | |
D. only in the day |