Concept:Leaf fall in deciduous trees is an adaptation to reduce water loss during unfavourable conditions.
Explanation:Leaves are the main organs through which water is lost as vapour in the process known as transpiration.
The rate of water loss depends directly on the total leaf surface area exposed to the atmosphere.
When a deciduous tree sheds its leaves, its exposed surface area is greatly reduced.
A smaller surface area means less water escapes from the plant.
Therefore, the plant conserves its internal water supply and is better able to survive dry seasons or harsh weather.
This survival advantage is more important than the loss of leaves for photosynthesis.
Answer:A. reduces the rate of transpiration