Correct Answer: Prevent water loss
The thick waxy outer covering found on most plant leaves is called the cuticle. It is primarily composed of a waterproof substance known as cutin and serves as a protective barrier against excessive water loss through evaporation. The cuticle is especially important for plants living in dry or hot environments where conserving water is essential for survival. Besides reducing water loss, it also protects leaves from harmful microorganisms, pollutants, ultraviolet radiation, and physical damage. Although gases enter and leave the leaf mainly through stomata, the waxy cuticle helps regulate moisture levels without significantly interfering with photosynthesis. This adaptation plays a crucial role in maintaining plant health and improving resistance to environmental stress.
- Structure: Waxy cuticle.
- Main Function: Prevents water loss.
- Composition: Cutin.
- Additional Protection: Against pathogens and UV radiation.
- Correct Answer: Prevent water loss.