2.2. Gas Exchange in Insects

The flow of oxygen (in order) into the cells of an insect is

• spiracles - trachea - tracheole fluid - cells - tracheole

• spiracles - cells - trachea - tracheole - tracheole fluid

• cells - tracheole fluid - tracheole - trachea - spiracles

• spiracles - trachea - tracheole - tracheole fluid - cells

True or false:

Tracheoles have rings of chitin

• true

• false

To prevent moisture loss Insects have a?

• permeable exoskeleton

• impermeable exoskeleton

Name the structure through which gases enter and leave the body of an insect.

• tracheoles

• alveoli

• spiracle

• lungs

Tubifex worms are small, thin animals that live in water. They have no specialised gas exchange or circulatory system. Name the process by which oxygen reaches the cells inside the body of a tubifex worm.

• active transport

• respiration

• diffusion

• facilitated diffusion

Which adaptations help reduce water loss in insects? (tick all that apply)

• guard cells that open and close the spiracles

• valves that open and close the spiracles

• hairs around the spiracles