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Biology
Required practicals
RP8
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Created by
Evie Coburn
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Cards (26)
What is the independent variable in the light intensity experiment?
Light
intensity
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What is the dependent variable in the light intensity experiment?
Height of the seedlings
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What is used to soak the cotton wool in the experiment?
Equal volumes
of water
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Why is the volume of water considered a control variable?
It ensures
consistent
watering
across
dishes
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How many mustard seeds are placed in each dish?
10
mustard seeds
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What is another control variable in the experiment?
Type of
seed
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What should be done if the number of seedlings differs among dishes?
Remove seedlings to
equalize
the number
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How should the height of each seedling be measured?
Using a
ruler
while holding the stems straight
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Where should the dishes be placed for the experiment?
In different light
conditions
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What are the three light conditions used in the experiment?
Full sunlight
,
partial light
, and
darkness
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How often should the height of seedlings be measured?
Every day for at least
five
days
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What should be done with the results after the experiment?
Calculate
mean
seedling height and draw
diagrams
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Why do seedlings grow towards the light source?
Due to
phototropism
caused by
auxin
concentration
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What happens to seedlings kept in the dark?
They grow
rapidly
but have small
yellow
leaves
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Why do seedlings have small yellow leaves in the dark?
They cannot
photosynthesize
without light
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How does gravity affect the growth direction of seedlings?
Roots
grow downwards,
shoots
grow upwards
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What happens to auxin in roots due to gravity?
Auxin builds up on the
lower
side
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How does auxin affect root growth in response to gravity?
It inhibits growth on the
lower
side
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Where can students find more questions on this practical?
In the
vision workbook
linked above
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Why is it important to learn the details of the required practical?
To perform the
experiment
accurately and effectively
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What role does auxin play in plant growth control?
It regulates
growth
direction
and
rate
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Why is accurate measurement and recording of results crucial?
It ensures reliable and valid
experimental outcomes
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How does phototropism relate to auxin?
Auxin concentration causes
seedlings
to bend towards light
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What are the effects of light intensity on seedling growth?
Higher
light intensity promotes
better
growth
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How do seedlings in darkness differ from those in light?
Dark seedlings grow rapidly but lack
chlorophyll
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What is the relationship between auxin distribution and root growth?
Auxin
concentration
affects growth
direction
in roots
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