Which of these is NOT a structural adaptation of desert plants for water conservation?

Analyze the question: The question asks for the feature that is NOT a water-conservation adaptation. Four options help a plant save water, and one does the opposite.

Concept: Desert plants (xerophytes) live where water is scarce and temperatures are high. Their main problem is losing too much water through transpiration, which happens mostly through the leaves and stomata. Their structural adaptations therefore aim to reduce the surface area for water loss and slow down evaporation.

Evaluating each option:

• A. Broad leaves with many stomata: A large leaf surface and many stomata mean a lot of water lost by transpiration. This is the opposite of an adaptation to conserve water, so it is NOT an adaptation.
• B. Leaves reduced into spines: This reduces surface area for transpiration (as in cactus). It is an adaptation.
• C. Scale leaves: These are small leaves with little surface area. They reduce water loss, so it is an adaptation.
• D. Thick cuticle on stems and leaves: The waxy layer is waterproof and cuts down evaporation. It is an adaptation.
• E. Sunken stomata: Stomata in pits trap humid air and reduce air movement over them, which lowers transpiration. It is an adaptation.

Answer: The only feature that increases water loss rather than conserving it is broad leaves with many stomata.

Exam tip: When you see "NOT" in a question, test each option by asking, "Does this help the plant save water?" Anything that increases surface area or the number of openings (broad leaves, many stomata) belongs to plants in wet habitats (mesophytes or hydrophytes), not desert plants. Remember: xerophytes = small, thick, waxy, sunken, spiny.