Question

why do deciduous forest shed their leaves once a year​

Answer 1

Since deciduous plants lose their leaves to conserve water or to better survive winter weather conditions, they must regrow new foliage during the next suitable growing season; this uses resources which evergreens do not need to expend.

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Answer 2

Deciduous trees have a watery sap compared to other coniferous trees. These trees shed their leaves during dry season in order to conserve resources and protect the tree from being blown over in windy winter months.

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