As a tree goes into dormancy, its leaves change color. what causes this change in color? a) the tree makes extra chlorophyll. b) the tree stops making chlorophyll. c) the tree produces extra hormones. d) the tree stops producing hormones.

The correct answer will be option B-the tree stops making chlorophyll.

Explanation:

Tree dormancy is the phase in the life of a tree or plants when they undergo dormant in response to adverse growing conditions such as during cold or winter.

In winters, plants start changing the leaf of color and then fall off their leaves to save energy which is invested in maintaining the leaves as during winter plants absorb very few or no amount of light. Since they are not able to perform photosynthesis and synthesizing food, they stop making chlorophyll pigment and start degrading their already present chlorophyll pigments in the leaves into simple molecules. Other pigments like anthocyanin and carotenoids take the place and provide red, pink and orange colour to the leaves and leaves fall off from the tree.

Thus, option B-the tree stops making chlorophyll is the correct answer.

"a.) well–developed vascular system."