Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss? 1. Hard and waxy leaves 2. Tiny leaves or no leaves 3. Thorns instead leaves Select the correct answer using the codes given below.

Desert plants, known as xerophytes, exhibit several structural modifications to survive extreme aridity and minimize water loss through transpiration. First, many possess hard, waxy, or leathery leaves with thick cuticles that act as a barrier to evaporation [2]. Second, reducing leaf size to tiny or needle-shaped forms significantly decreases the surface area available for water loss [2]. Third, in extreme cases like cacti, leaves are entirely modified into thorns or spines, which not only minimize transpiration but also provide protection against herbivores [2]. In such plants, the stem often becomes fleshy and green (phylloclade) to take over the function of photosynthesis [1]. These combined adaptations—waxy coatings, reduced leaf area, and the presence of spines—are essential mechanisms for moisture conservation in desert biomes [2].

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 3: MAJOR BIOMES > 10. Desert Biomes > p. 15
2. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 18: The Hot Desert and Mid-Latitude Desert Climate > Natural Vegetation > p. 176