Question

Vein loading is the active transport of sugars from :

• A. Mesophyll cells to vessels
• B. Vessels to mesophyll cells
• C. Mesophyll cells to sieve tubes
• D. Sieve tubes to mesophyll cells

Answer 1

The correct option is C Mesophyll cells to sieve tubes

• Vein loading is the process involved in the transport of food in the plants.
• The process of vein loading includes the movement of carbohydrates or sugar.
• The sugar moves from the mesophyll cells by the symplast pathway. The sugar then moves forward by the apoplast pathway and enters the phloem.
• This process is known as vein loading. The sugar then enters the sieve tubes of the phloem through which they can be transported to other parts of the plant.

Thus, the correct answer is option C.