AP BIOLOGY

Detailed explanation-1: -Holes in flower leaves usually indicate insect pests rather than disease, which tends to cause spots on the leaves or dropping leaves. Holes are caused by insects with chewing mouthparts, such as caterpillars and beetles.

Detailed explanation-2: -The phenomenon of falling of leaves and the fruits from the plant is known as abscission.

Detailed explanation-3: -Autumn is also called fall season and the trees shed their leaves during the autumn. The trees shed their leaves and flowers inorder to survive the upcoming harsh cold winters.

Detailed explanation-4: -The changes in weather and daylight trigger a hormone that releases a chemical message to each leaf that it is time to prepare for winter. Over the next few weeks, abscission cells form a bumpy line at the place where the leaf stem meets the branch. And slowly, but surely, the leaf is “pushed” from the tree branch.