Multiple Choice
Turgor pressure helps a seed in which of the following ways?
53
views
34. Vascular Plant Transport
Water Potential
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In terms of water potential and plant transport, how does transpiration help a plant during hot summer conditions?
A
It increases water potential in leaves, causing water to move out of the xylem and into the atmosphere more slowly.
B
It creates a water potential gradient (lower water potential in leaves) that pulls water upward through the xylem, helping deliver water for cooling and maintaining cell turgor.
C
It pumps water actively into the xylem using ATP, independent of any water potential gradient.
D
It stops water loss by closing stomata permanently, which increases carbon dioxide uptake for photosynthesis.
Verified step by step guidance1
Understand the concept of water potential (Ψ), which is a measure of the potential energy of water in a system. Water moves from areas of higher water potential to areas of lower water potential.
Recognize that transpiration is the process where water evaporates from the leaf surfaces, primarily through stomata, creating a lower water potential in the leaves compared to the roots and soil.
Identify that this lower water potential in the leaves creates a water potential gradient, which acts as a driving force pulling water upward through the xylem vessels from the roots to the leaves.
Note that this upward movement of water helps deliver essential water to leaf cells, which is important for cooling the plant through evaporative loss and maintaining cell turgor pressure, crucial for structural support.
Conclude that transpiration does not involve active pumping of water with ATP, nor does it permanently close stomata to stop water loss; instead, it relies on passive water potential gradients to facilitate water transport.
Related Videos
Related Practice
Water Potential practice set
Problem sets built by lead tutorsExpert video explanations