Question

Which of the following does not appear to involve active transport across membrane?

• A. the movement of mineral nutrients from the apoplast to the symplast
• B. the movement of sugar from mesophyll cells into sieve-tube members in corn
• C. the movement of sugar from one sieve-tube member to the next
• D. $K^{+}$ uptake by guard cells during stomatal opening.

Answer 1

Answer: (A)

the movement of mineral nutrients from the apoplast to the symplast

The apoplast is formed by the continuum of cell walls of adjacent cells as well as the extracellular spaces. The apoplast pathway facilitates the transport of water and solutes across a tissue or organ. The inner side of the plasma membrane is the symplast.

So, the correct option is 'The movement of mineral nutrients from the apoplast to the symplast'.