1. Some environmental stress factors such as high light intensity, drought, chil
ID: 208350 • Letter: 1
Question
1. Some environmental stress factors such as high light intensity, drought, chilling, air pollutants and mineral nutrient deficiencies are harmful to plant, one of the reason is because they: A. increase the use of energy B. decrease the water movement C. affect the composition, structure and integrity of cell membrane 2. The electrochemical gradient is A. The total chemical potential gradient B. The total electrical potential gradient C. All the above 3. Water and mineral nutrients are transported from root to shoot via A. Plasmodesmata B. Cell wall C. Xylem D. Phloem 4. The marked cells are A. Plasmodesmata B. Xylem C. Phloem D. Casparian stripExplanation / Answer
Answer 1 c) affect the composition, structure and integrity of cell membrane.
affects stomatal closure, limits gaseous exchange, reduces transpiration and arrests carbon assimilation (photosynthesis) rates.
Answer 2 c) All the above.
The gradient consists of two parts, the chemical gradient, or difference in solute concentration across a membrane, and the electrical gradient, or difference in charge across a membrane.
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