MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of these is not an effect of water stress? |
| A. | Closing of stomata |
| B. | Increase in metabolism |
| C. | Wilting of leaves |
| D. | Reduction in surface area of leaves |
| Answer» C. Wilting of leaves | |
| 2. |
Why do stomata close during water shortage? |
| A. | To reduce CO<sub>2</sub> availability |
| B. | To trap water |
| C. | To increase metabolic activity |
| D. | To increase the surface area of leaves |
| Answer» B. To trap water | |
| 3. |
Which of these plants have the highest optimum temperature? |
| A. | Tropical C<sub>3</sub> |
| B. | Temperate C<sub>3</sub> |
| C. | Tropical C<sub>4</sub> |
| D. | Temperate C<sub>4</sub> |
| Answer» D. Temperate C<sub>4</sub> | |
| 4. |
Which of these plants are grown in carbon dioxide enriched atmosphere? |
| A. | Maize |
| B. | Sugarcane |
| C. | Tomato |
| D. | Millets |
| Answer» D. Millets | |
| 5. |
At what concentration do C4 plants show saturation? |
| A. | 430 lL<sup>-1</sup> |
| B. | 450 lL<sup>-1</sup> |
| C. | 340 lL<sup>-1</sup> |
| D. | 360 lL<sup>-1</sup> |
| Answer» E. | |
| 6. |
Increase in CO2 concentration up to 0.5% causes an increase in photosynthesis. True or false? |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
What is the atmospheric concentration of carbon dioxide? |
| A. | 0.3 0.4% |
| B. | 3 4% |
| C. | 0.03 0.04% |
| D. | 0.003 0.004% |
| Answer» D. 0.003 0.004% | |
| 8. |
What happens when the incident light on a plant is excessive? |
| A. | RuBP undergoes oxidation |
| B. | Vascular bundles lose functionality |
| C. | Mesophyll cells are destroyed |
| D. | Chlorophyll breaks down |
| Answer» E. | |
| 9. |
At what percentage of sunlight does light saturation occur? |
| A. | 30 |
| B. | 20 |
| C. | 10 |
| D. | 15 |
| Answer» D. 15 | |
| 10. |
Which scientist gave the Law of Limiting Factors? |
| A. | Hooke |
| B. | Blackman |
| C. | Fleming |
| D. | Mendel |
| Answer» C. Fleming | |
| 11. |
Which of these statements is false regarding the factors affecting photosynthesis? |
| A. | The leaf orientation of a plant affects photosynthesis |
| B. | Both internal and external factors affect photosynthesis |
| C. | Photosynthetic rate is determined by a factor at sub-optimal level |
| D. | Both CO<sub>2</sub> concentration in the environment and inside the plant affect photosynthesis |
| Answer» B. Both internal and external factors affect photosynthesis | |
| 12. |
Which of these is not an external factor affecting photosynthesis? |
| A. | Sunlight |
| B. | Temperature |
| C. | Leaf orientation |
| D. | CO<sub>2</sub> concentration |
| Answer» D. CO<sub>2</sub> concentration | |
| 13. |
What do the internal factors affecting photosynthesis dependent on? |
| A. | External factors |
| B. | Geographical area |
| C. | Genetic predisposition |
| D. | Species and sub-species |
| Answer» D. Species and sub-species | |
| 14. |
Which of these is not an internal factor affecting photosynthesis? |
| A. | Size |
| B. | Age |
| C. | Number |
| D. | Water |
| Answer» E. | |