Question 1
The following passage outlines the process of phototropism in plants:
'Auxin is synthesised in cells at the ............ of the shoot. Auxin causes the cells to ............ on one side, so the stem bends.
Scientists originally thought auxin was ............ by light but this was disproved by the fact that plants growing in the dark and plants growing in unilateral light had ............ auxin levels.'
What is the correct sequence of missing words?
meristem, shorten, destroyed, different
tip, elongate, destroyed, similar
meristem, shorten, synthesised, raised
tip, elongate, synthesised, similar
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Question 2
Which statement provides evidence for geotropism?
leaves are shed from deciduous plants in the autumn
roots grow downwards
shoots grow towards the light
flowers can change position throughout the day
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Question 3
What determines the direction of a taxis in motile organisms?
the speed of the organism's movement
the organism's reproductive cycle
the direction of the environmental stimulus
the time of day
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Question 4
How do single-celled algae respond to light?
they move away from light due to negative phototaxis
they move towards light exhibiting positive phototaxis
they remain stationary and absorb light
they move randomly regardless of light
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Question 5
Why is positive phototaxis beneficial to single-celled algae?
it allows them to find more nutrients in the dark
it helps them to avoid predators
it increases their chances of survival by aiding in photosynthesis
it conserves their energy by reducing movement
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Question 6
What is the main difference between taxes and kineses as responses in organisms?
taxes are faster than kineses
taxes are directional movements while kineses are not
taxes can only occur in multicellular organisms
kineses involve movements towards a stimulus
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Question 7
Which of the following is an example of a negative taxis?
bacteria moving towards glucose
algae moving towards light
earthworms moving away from light
fish swimming towards oxygenated water
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Question 8
What kind of movement do earthworms exhibit when they experience light?
random movement
movement towards light
movement away from light
stationary behaviour
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Question 9
What type of taxis do bacteria exhibit when moving towards a higher concentration of glucose?
positive phototaxis
positive chemotaxis
negative phototaxis
negative chemotaxis
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Question 10
In a kinesis, what happens to the rate of turning when an organism encounters a favourable environment?
it remains the same
it decreases
it increases sharply
it fluctuates unpredictably
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Question 11
Why might woodlice move more slowly in damp conditions?
to conserve energy
due to their natural nocturnal behaviour
to avoid predators
to increase their chance of staying within the favourable environment
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Question 12
When are woodlice more likely to change direction rapidly?
when they are in a dry environment
when they are in an unfavourable environment
when they are in their natural habitat
when they are exposed to light
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