MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Biotechnology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The movement of most minerals, including potassium into root cells is by |
| A. | osmosis |
| B. | diffusion |
| C. | bulk flow |
| D. | active transport |
| Answer» E. | |
| 2. |
The evaporation of water from leaves is called |
| A. | transpiration |
| B. | cohesion |
| C. | tension |
| D. | pressure flow |
| Answer» B. cohesion | |
| 3. |
When guard cells swell |
| A. | stomata close |
| B. | stomata open |
| C. | photosynthesis stops |
| D. | evaporation stops |
| Answer» C. photosynthesis stops | |
| 4. |
The cohesion-tension theory of water movement helps to explain how water moves from soil into root? |
| A. | Through the phloem |
| B. | From leaf to root |
| C. | Through the xylem |
| D. | Into the guard cells |
| Answer» D. Into the guard cells | |
| 5. |
Water moves into roots of plants by |
| A. | osmosis |
| B. | active transport |
| C. | diffusion |
| D. | pressure flow mechanism |
| Answer» B. active transport | |
| 6. |
Phloem is composed of |
| A. | vessel elements and companion cells |
| B. | tracheids and vessel elements |
| C. | sieve-tube elements and companion cells |
| D. | tracheids and sieve-tube elements |
| Answer» D. tracheids and sieve-tube elements | |
| 7. |
Normally CO2 and O2 enter a plant by |
| A. | osmosis |
| B. | active transport |
| C. | diffusion |
| D. | evaporation |
| Answer» D. evaporation | |
| 8. |
A widely accepted explanation for transport of sugar in phloem is called |
| A. | root pressure theory |
| B. | transpiration |
| C. | pressure flow hypothesis |
| D. | cytoplasmic streaming |
| Answer» D. cytoplasmic streaming | |