Q1. The tropical deciduous trees shed their leaves in summer
(a) Leaves get dried up due to the excessive heat
(b) To prevent excessive loss of water through transpiration
(c) Because rainfall is inadequate
(d) Days are longer
(UPSC Prelims 1983)
Answer: (b) To prevent excessive loss of water through transpiration
Explanation: Tropical deciduous trees shed their leaves in summer to minimize water loss through transpiration. This adaptation helps them survive dry conditions, especially when rainfall is scarce and temperatures are high.
