Cuticle

Definition

A cuticle is a protective, non-cellular layer found on the outer surface of both plants and invertebrates. In plants, it minimizes water loss; in arthropods, it forms part of the exoskeleton providing structural support and protection.

5 Must Know Facts For Your Next Test

1. The plant cuticle is primarily composed of cutin and waxes.
2. In arthropods, the cuticle consists mainly of chitin and proteins, often hardened by sclerotization or mineralization.
3. The cuticle’s thickness and composition can vary significantly depending on environmental conditions and species-specific adaptations.
4. It plays a critical role in preventing desiccation and pathogen invasion in both plants and arthropods.
5. Regular molting (ecdysis) in arthropods involves shedding the old cuticle to allow for growth.

Review Questions

• What are the main components of a plant cuticle?
• How does the cuticle contribute to an arthropod's survival?
• Why is ecdysis important for arthropods?

Related terms

Ecdysis: The process by which arthropods shed their exoskeleton to grow larger.

Chitin: A long-chain polymer that forms part of the hard exoskeletons in arthropods and some fungi cell walls.

Cutin: A waxy substance that composes much of the plant cuticle, aiding in water retention and protection from pathogens.