Question

Which of the following is not a process taking place against the concentration gradient?

• A. Transpiration
• B. Diffusion
• C. Translocation
• D. All of the above

Answer 1

The correct option is D All of the above

All of the above-mentioned processes are transport processes in the direction of the concentration gradient.

• Transpiration is a loss of water from plants in vapour form through stomata in leaves. It is in the direction of concentration gradient because the concentration of water vapour in the atmosphere is far less than the water content in the plants.
• Diffusion by definition is the physical transport of molecules along the concentration gradient without the expenditure of energy.
• Translocation is the transport of sugars from the region of synthesis. Energy expenditure is involved in translocation of sugar, but the direction is same as dictated by the concentration gradient of sugar in a plant.