how do the trees become dropping
Answers
Answer:
In spring and summer, leaves convert sunlight into energy in a process we all know as photosynthesis. During that process, the trees lose a lot of water – so much water that when winter arrives, the trees are no longer able to get enough water to replace it.
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Answer:
Melissa Petruzzello is Assistant Editor of Plant and Environmental Science and covers a range of content from plants, algae, and fungi, to renewable energy and environmental engineering. She has her M.S....
European beech trees in autumn.
In temperate regions of the world, autumn is marked by the brightly colored foliage that slowly drops from trees and shrubs to carpet the ground. But why do some plants shed their leaves before winter? It turns out autumnal leaf drop is a form of self-protection. While evergreen plants in cold climates have thick waxes and resins to protect their leaves from freezing and fracturing, deciduous species generally have thin leaves that are susceptible to cold temperatures. Since water expands when frozen, the tender leaf cells would rupture during the winter, making them useless for photosynthesis. Without dropping these leaves, such a tree would be stuck with thousands of unproductive appendages and no way to make food! As if that weren't reason enough, the surface area of all those leaves would also pose a threat to the plant’s physical integrity. Winter months are often windier than other seasons, and the wind against the broad leaves on a cold, brittle tree could cause major breakage. The same goes for the weight of snow collecting on all those leaves. Finally, by the end of summer, many leaves are insect-eaten, diseased, or otherwise damaged. Dropping them gives the plant a fresh start in the spring, and the nutrients from the decaying leaves are recycled to help grow the next leafy generation.