Multiple choice

A concentration gradient of water vapour between the atmospheric air and intercellular spaces of leaves is created by

  1. the accumulation of water vapour in the intercelluar spaces of mesophyll which were created by the sun light on the surface of mesophyll cell walls

  2. the water in the cells filling the intercellular spaces of leaves

  3. the translocated water with the mesophyll cells of leaves through Xylem tissue

  4. the water present in the large intercelluar spaces and large number of stomataon the leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sunlight heats the mesophyll cell walls, causing water to evaporate into the intercellular spaces. This creates a water vapour gradient between these spaces and the external atmosphere. Option A correctly describes this mechanism, while B incorrectly states water fills the spaces (it's vapour, not liquid). C describes xylem transport, not vapour creation, and D is too vague.

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