Q.Which among the following is correct?
i. apoplast is fastest and operate in nonliving part
ii. Transmembrane route includes vacuole
iii. symplast interconnect the nearby cell through plasmadesmata
iv. symplast and transmembrane route are in living part of the cell

Step 1. Statement i says the apoplast route is fastest and operates in the nonliving part of the root - true, because the apoplast uses only cell walls and dead cell interiors, with no membrane crossings to slow it down, making it the lowest-resistance and generally fastest route.

Step 2. Statement ii says the transmembrane route includes the vacuole - true, because water on this route crosses at least two membranes per cell, and transport across the tonoplast (the vacuole's membrane) is specifically part of this pathway.

Step 3. Statement iii says the symplast interconnects nearby cells through plasmodesmata - true, because the symplast is defined as the connected mass of cytoplasm of living cells, linked cell to cell precisely by these cytoplasmic channels.

Step 4. Statement iv says the symplast and transmembrane routes are in the living part of the cell - true, because both routes require water to cross living plasma membrane (and, for the transmembrane route, the tonoplast too), unlike the apoplast route, which stays entirely in dead/non-living tissue.

Step 5. Since every one of the four statements i-iv is individually correct, the only option that captures this is the one listing all four together.

Verify each of the four statements independently against the defining features of the apoplast, symplast and transmembrane pathways, then select the option that includes every true statement.

• Assuming only the symplast-related statements (ii, iii) are correct and overlooking that the apoplast statement (i) is equally valid.
• Confusing the transmembrane route (which crosses a membrane at every single cell) with the symplast route (which crosses a membrane only once, then moves via plasmodesmata).