The image shows leaves that have fallen from trees in a deciduous forest during autumn. Which statement best explains why it is beneficial for a tree to lose its leaves in autumn?
A.
By losing its leaves, the tree is more resistant to fungal diseases.
B.
By losing its leaves, the tree is shielded from cold, strong winds during winter.
C.
By losing its leaves, the tree is able to conserve water and energy during winter.
D.
By losing its leaves, the tree is able to perform photosynthesis more efficiently.
C. By losing its leaves, the tree is able to conserve water and energy during winter.
C. By losing its leaves, the tree is able to conserve water and energy during winter.
To determine which statement best explains why it is beneficial for a tree to lose its leaves in autumn, we need to consider the purpose of leaf loss and the effects it has on the tree during winter.
One way to find the answer is by understanding the process of leaf loss in deciduous trees and its benefits. Deciduous trees shed their leaves in response to changes in light and temperature during autumn. As the days become shorter and temperatures drop, the tree initiates a process called abscission, where it forms a protective layer of cells at the base of each leaf stem. This layer eventually cuts off the supply of nutrients to the leaf, causing it to wither and fall.
Now, let's evaluate each statement to see which one best aligns with the benefits of leaf loss in deciduous trees:
A. By losing its leaves, the tree is more resistant to fungal diseases.
This statement doesn't directly correspond to the benefits of leaf loss. While the shedding of leaves can remove potential sources of fungal pathogens, it is not the primary reason for leaf loss in autumn.
B. By losing its leaves, the tree is shielded from cold, strong winds during winter.
This statement captures one of the advantages of leaf loss. Without leaves, the trees are less susceptible to damage from strong winds during winter. Leaves act as sails, catching the wind and potentially causing breakage.
C. By losing its leaves, the tree is able to conserve water and energy during winter.
This statement aligns with the primary benefit of leaf loss in deciduous trees. With the loss of leaves, the tree reduces its water loss through transpiration and conserves energy that would otherwise be required for leaf maintenance during the winter months. This allows the tree to remain dormant and survive the harsh conditions.
D. By losing its leaves, the tree is able to perform photosynthesis more efficiently.
This statement is incorrect. Losing leaves means the tree cannot carry out photosynthesis during winter. Photosynthesis requires sunlight, which is limited during this season. While the tree does shed leaves to prepare for winter, it is not related to improving photosynthesis efficiency.
Based on this analysis, the statement that best explains why it is beneficial for a tree to lose its leaves in autumn is:
C. By losing its leaves, the tree is able to conserve water and energy during winter.