Lesson Worksheet: Gas Exchange in Insects Biology
In this worksheet, we will practice describing the key structures associated with gas exchange in insects and relating their structure to their function.
Q1:
Which of the following statements about the spiracles of an insect is correct?
- AThey allow water to leave the insect’s body, but they do not allow air to enter it.
- BThey are permanently held open, so the rate of gas exchange is directly proportional to the rate of water loss.
- CThey allow air to enter the insect’s respiratory system, but they also allow water loss from the body.
Q2:
What is the primary purpose of the trachea in insects?
- ATo hold the airways of the insect open and prevent them from collapsing under changes in pressure
- BTo provide a network of vessels to transport oxygenated and deoxygenated blood around the body of the insect
- CTo provide an internal network of tubes that allow gas exchange between the atmosphere and the insect’s tissues
- DTo control the volumes of oxygen entering and water leaving the insect with patterns of opening and closing
Q3:
Through which structures does air initially enter an insect?
- AThe tracheoles
- BThe bronchi
- CThe trachea
- DThe spiracles
- EThe stomata
Q4:
How is the volume of air taken in controlled by insects?
- ABy the processes of countercurrent gas exchange
- BBy the opening and closing of the spiracles
- CBy the muscular contractions of the lungs
- DBy the opening and closing of the stomata
Q5:
Fill in the blanks: When an insect is resting, the ends of the tracheoles contain tracheal . The tracheoles are the location where exchanged with the respiring insect’s tissues.
- Afluid, gases are
- Brings, blood is
- Cvessels, nutrients are
- Dcapillaries, oxygen is
Q6:
The trachea of an insect has circular bands of chitin. What is the function of this chitin?
- ATo move food through the trachea
- BTo contract and relax the trachea
- CTo produce mucus that allows air to flow through the trachea more easily
- DTo provide structural support to the trachea
Q7:
The diagram shows the major structures associated with gas exchange in insects. Which number indicates the trachea?
Q8:
The diagram shows the major structures associated with gas exchange in insects. Which number indicates the tracheoles?
Q9:
The diagram provided shows a simplified outline of a part of an insect’s respiratory system. How does this specialized respiratory system benefit insects?
- AIt allows all insects to survive for prolonged periods underwater.
- BIt delivers oxygen directly to tissues and cells that are carrying out cellular respiration.
- CIt allows carbon dioxide to be broken down into carbon and oxygen.
- DIt prevents the entry of pathogens.
Q10:
The diagram shows the major structures associated with gas exchange in insects. Which number indicates the spiracle?
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