do all plants shed their leaves through out the world at the same time why. why not ?
Answers
Answer:
There are two kinds of trees: those that shed their leaves and those that do not.
Trees that lose all their leaves once a year are called deciduous whereas trees which lose their leaves continuously and not all at once are called evergreen.
Deciduous trees, or those that lose their leaves, begin to change with the seasons.
Each season is characterized by differences in temperature, amounts of precipitation, and the length of daylight.
In the autumn months of temperate zones, the dropping of the outside temperature and the reduction of the amount of sunlight each day causes trees to change color and then to drop. (The amount of rainfall also affects deciduous trees, as mentioned below.)
These zones extend from 23.5 degrees North (and South) latitude to 66.5 degrees North (and South) latitude.
The fall (or autumn) in the northeastern portion of the United States and Canada, for example, generally starts some time in October and is considered by many to be one of nature's most beautiful displays, with trees that turn from green to colors that range from yellow to orange to deep red. When all of the leaves have dropped and the season turns cold, deciduous trees enter a period of dormancy.
Leaves Also shed their leaves amid shortage of water....
Explanation:
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Answer:
In temperate forests across the Northern Hemisphere, trees shed their leaves during autumn as cold weather approaches. In tropical and subtropical forests, trees shed their leaves at the onset of the dry season. Many types of trees shed their leaves as a strategy to survive harsh weather conditions. Trees that lose all of their leaves for part of the year are known as deciduous trees. Those that don’t are called evergreen trees.
Common deciduous trees in the Northern Hemisphere include several species of ash, aspen, beech, birch, cherry, elm, hickory, hornbeam, maple, oak, poplar and willow. In tropical and subtropical regions, deciduous trees include several species of acacia, baobab, roble, ceiba, chaca and guanacaste.
Most deciduous trees have broad leaves that are susceptible to being damaged during cold or dry weather. In contrast, most evergreen trees either live in warm, wet climates or they have weather-resistant needles for leaves. However, there are exceptions in nature, such as tamarack trees that shed their needles every autumn and live oaks that retain their broad leaves for the entire year even in relatively cool climates.
Shedding leaves helps trees to conserve water and energy. As unfavorable weather approaches, hormones in the trees trigger the process of abscission whereby the leaves are actively cut-off of the tree by specialized cells. The word abscission shares the same Latin root word as that in scissors, scindere, which means “to cut.” At the start of the abscission process, trees reabsorb valuable nutrients from their leaves and store them for later use in their roots. Chlorophyll, the pigment that gives leaves their green color, is one of the first molecules to be broken down for its nutrients. This is one of the reasons why trees turn red, orange, and gold colors during the fall. At the end of the abscission process, when the leaves have been shed, a protective layer of cells grows over the exposed area.
The shedding of leaves may also help trees to pollinate come springtime. Without leaves to get in the way, wind-blown pollen can travel longer distances and reach more trees.
Bottom line: Many types of trees shed their leaves as a strategy to survive cold or dry weather.