2013
Q. 94
Set A
Environment & Ecology
Adaptations
Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss?
- Hard and waxy leaves
- Tiny leaves or no leaves
- Thorns instead of leaves
Select the correct answer using the codes given below.
Smart Elimination
Consider a cactus growing in desert area - you can observe that there is thorns instead of leaves, it's waxy and hard. Plants in the desert need to save water. Wax seals the water in. Thorns stop animals from eating the water-filled plant. Tiny leaves catch less sun. All are standard survival tricks.
Answer Key & Explanation
Answer: DThe correct answer is Option D.
Explanation: Plants in desert areas (Xerophytes) adapt to prevent water loss (Transpiration):
- Hard and waxy leaves: The cuticle is thickened and waxy to prevent evaporation. (Correct)
- Tiny leaves or no leaves: Reduces surface area. In some, leaves become spines (Opuntia). (Correct)
- Thorns instead of leaves: Protects from grazing and reduces surface area. (Correct)
Value Addition
- CAM Pathway: Desert plants often use Crassulacean Acid Metabolism (stomata open at night) to save water.
- Deep Roots: To tap groundwater.
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Difficulty Assessment
easy
Foundational question based on core concepts.