Explain a transpiration graph

Biology Asked on May 8, 2021

enter image description here

The solution is A, but I think both A and C are correct. For choice C, stomata that protected by hairs will have a greater amount of water vapour around them, hence lower water potential gradient. Hence, this results in the reduction in the rate of transpiration, as well as choice A.

One Answer

Though I don't come across graphs like these too often, I guess the answer should be A because...

From the graph, it is clear that Leaf 1 has more mass than Leaf 2 after 5 hours. This means there is a lower rate of transpiration in Leaf 1, which can definitely be explained by a thicker cuticle (since the thicker the cuticle, less is the water lost). Hence choice A is correct.

Now, look at choice C. Like you said, in leaves where stomata are protected by hairs, there will be lower rate of transpiration. Then, obviously Leaf 2 should have a higher mass than Leaf 1, right? But this is not the case (as per the graph). Hence, choice C is incorrect.

Correct answer by Irena on May 8, 2021

Add your own answers!

Ask a Question

Get help from others!

© 2024 All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP