So, I was doing a AS level MCQ, the question tells us that water passes across the leaf tissues by different routes as a result of 1) differences in water potential 2) the pull transmitted by cohesive forces

Then, they gave different routes Route 1) apoplastic Route 2) vacuolar Route 3) symplastic

Which row correctly identifies why water passes across leaf tissues by the different routes?

  [1]: https://i.stack.imgur.com/KVCyW.jpg

Answer is D.

Attempt at question: At first I thought it was B because vacuolar route appears to me that as water moves through the cell, water from the vacuoles would also be “pulled”, whilst apoplast and symplastic pathway is when water moves down the WP grad. Okay, so it wasn’t B, and I’ve come to realise that there’s no way water can “pull” water from the vacuole as there’s a tonoplast. I’ve done my research and found out that vacuolar and symplastic involves osmosis so maybe that’s why it’s due to “diff. In WP”. My main question is, isn’t apoplast pathway due to difference in water potential too? Please help to clarify and correct any assumptions that I’ve made if they were wrong. Thank you.


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