Atmospheric CO₂ has been increasing rapidly since the late 1800s, largely due to human activities. Recall that CO₂ enters leaves through stomata and can then be used for photosynthesis. However, transpiration occurs as a result of water evaporating through stomata. How have plants responded to elevated CO₂ levels?
Which of these structural features can help to limit water loss in plants that occupy dry habitats?
a. Abundant companion cells and sieve-tube elements
b. Stomata that are located in pits on the undersides of their leaves, or narrow, needlelike leaves c. extensive networks of xylem and phloem
d. Stomata that are located on the top surface of leaves, or broad leaves

Question

Atmospheric CO₂ has been increasing rapidly since the late 1800s, largely due to human activities. Recall that CO₂ enters leaves through stomata and can then be used for photosynthesis. However, transpiration occurs as a result of water evaporating through stomata.

How have plants responded to elevated CO₂ levels?

What impact, if any, do you predict elevated CO₂ levels will have on the number of stomata in leaves and on the transpiration rate?

Which of these structural features can help to limit water loss in plants that occupy dry habitats?

a. Abundant companion cells and sieve-tube elements

b. Stomata that are located in pits on the undersides of their leaves, or narrow, needlelike leaves c. extensive networks of xylem and phloem

d. Stomata that are located on the top surface of leaves, or broad leaves

Accepted Answer

Hello everyone and welcome to today's video. So all of the following features help plants conserve water except remember that we're looking for the incorrect or the feature that does not help plants conserve water begin by answer choice. The reduction in the number of leaves. Remember that lives is where photosynthesis takes place. And for the sin disease requires water. So if we have less leaves, we're going to be performing less photosynthesis but we're also going to be using less water or conserving water. This is not the exception that we're looking for. So we're going to cancel it out. Then we have the presence of particles around leaves and stems. These chronicles are these waxy layers and these waxy layers. Their main function is to prevent water loss or to conserve water. So these are definitely going to help plants conserve water and they're not the exception that we're looking for. Then we have the suckling stems. These are specific type of stems are able to store more water. These are usually present in plants that are living in very dry environment. So these are going to hold the plants conserve more water and we're going to cancel this out. And then we have see a large number of sta mara on the upper side of leaves. I want you to remember that these Tamara are present in gas exchange. So the gasses come out and enter the plant through this Tamara. If we have this gas exchange occurring and H20 or water is present as a gas. If we have too many Samara, then the water or the geishas water is going to be able to escape the plant via DS Tamara. So this would not really help the plant conserve water, and it is going to be the exception that we're looking for. So we'll highlight it. That is the final answer to the question, and I really hope this video helped, too.

Verified video answer for a similar problem:

Key Concepts

Photosynthesis

Transpiration

Stomatal Adaptations