- Limiting Water Loss -
Limiting water loss in insects
Insects have evolved the following adaptations:
- Small surface area to volume ratio = minimise area over which water is loss
- Waterproofing covering = outer skeleton of chitin is covered with waterproof cuticle.
- Spiracles = opening of the tracheae at the body surface can be closed due to water loss occurs when the body is asleep.
Limiting water loss in plants
Terresteral plants have waterproof covering
Some have restricted supply of water = limiting water loss through transpiration // xerophytes
Modifications of a plant is made by:
- Thick cuticles
- Rolling up of leaves
- Hairy leaves
- Stomata in pits and grooves
- Reducing surface area to volume ratio of the leaves
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