Biology Exam Questions – Receptors With Solutions
Scientists investigated the effect of humidity on the movement of the insect, Tenebrio molitor. The insects were placed in choice chambers with one side kept at 100% humidity and the other side kept at 30% humidity. The insects were used one ...
Scientists investigated the effect of humidity on the movement of the insect, Tenebrio molitor.
The insects were placed in choice chambers with one side kept at 100% humidity and the other
side kept at 30% humidity. The insects were used one at a time and the path the insect followed
recorded on paper.
What type of behaviour was shown by the insect in Figure 1? (2) - Answers✓✓-kinesis
-no direction movement towards or away from stimulus (in this case, humidity)
The scientists found that the insects moved for 94% of the time in the more humid side, but in
the drier side they moved only 20% of the time. The scientists concluded that reduced
movement in the drier side was an adaptation that reduced water loss.
Use your knowledge of gas exchange in insects to explain how this behaviour would reduce
water loss in the insects. (2) - Answers✓✓-less respiration
-spiracles stay closed; less water loss through spiracles
Tenebrio molitor has two antennae on its head. These are sense organs
...
What type of behaviour did the scientists conclude that the insect in Figure 2 was showing? (1) -
Answers✓✓-taxis
After observing the behaviour of the insect in Figure 2, the scientists hypothesised that if an
insect had one of its antennae removed it would have a tendency to turn to one side and move in
circles. The scientists tested this hypothesis by cutting one antenna off another insect and
observing its movement.
Does the movement observed in Figure 3 support the scientists' hypothesis? Give the reason for
your answer. (2) - Answers✓✓-no; insect doesn't move in circles
-shows kinesis
The scientists then investigated the effect of a range of humidities on the activity of the insects.
Figure 4 shows their results. The triangles represent the number of insects still moving after 15
minutes.
A student studying Figure 4 concluded that as humidity increases, so does movement of the
insects.
Evaluate the student's conclusion. (2) - Answers✓✓-positive correlation between number of
insects still moving after 15 minutes, and percentage humidity.
-however, there are overlaps in individual experiments at all humidities; 70-90% humidity there
is little change in movement
Termites are insects. Some species live in colonies in the soil. Although most termites are
wingless, winged termites are sometimes produced. The winged termites fly from the soil, mate
and start new colonies.
...
What type of behaviour was shown by the termite from group B? (1) - Answers✓✓-taxis
Give the evidence for your answer. (1) - Answers✓✓-moving directly towards stimulus (light)
Explain what the results from group A suggest about the factors controlling the behaviour of
winged termites. (3) - Answers✓✓-when lacking visual stimulus, termites use their antennae to
go up against gravity
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