Drugs change chemical processes in a person's body.
Why is it difficult for a person to stop taking certain drugs?
1 mark - ANSWER addiction
Plants respond to different environmental factors.
Describe how different environmental factors affect:
the direction of growth of roots
the direction o...
AQA GCSE Biology Exam| Questions
Answered 100% Correct
Drugs change chemical processes in a person's body.
Why is it difficult for a person to stop taking certain drugs?
1 mark - ANSWER addiction
Plants respond to different environmental factors.
Describe how different environmental factors affect:
the direction of growth of roots
the direction of growth of shoots.
In your answer you should refer to the role of plant hormones.
Do not refer to the artificial use of plant hormones by gardeners or scientists.
6 mark - ANSWER Auxin is a plant hormone that controls the growth of plants near the tips of
shoots and roots.
It controls the growth of plants in response to light (photo tropism), gravity (geotropism)
and moisture.
When a shoot tip is exposed to light, more auxin accumulates in the shaded region making
the cells grow longer on the shaded region. This allows the shoot to bend towards the light.
When a shoot is growing sideways, gravity produces an unequal distribution of auxin in the tip,
with more auxin on the lower side. This causes the lower side to grow faster, causing the
shoot to grow upwards.
shoots grow against (the force of) gravity
, A root growing sideways will have more auxin in the lower side (bottom). But in the root,
the extra auxin inhibits the growth of the root on that region and cells on the top grow
longer causing the root to grow downwards
An uneven amount of moisture on either side of a root produces more auxin on the side with
more moisture. This inhibits the growth on that side and causes the root to grow towards the
moisture.
roots grow towards (the force of) gravity
What is a pathogen?
1 mark - ANSWER micro-organisms that cause infectious diseases
How can doctors reduce the number of bacteria that become resistant to antibiotics?
2 mark - ANSWER reduce / stop use of (current)
antibiotics
(reduce / stop use) for mild infections
Most of the time the two seaweeds are covered with water.
Bladder wrack has bladders filled with air.
Bladder wrack grows more quickly than saw wrack.
Suggest an explanation why
3 mark - ANSWER gets more light (near surface) (so) photosynthesises more
(because) bladders aid floating (when tide is in)
Angler fish live at depths of over 1000 m.
In clear water, sunlight does not usually reach more than 100 m deep.
Many angler fish have a transparent 'lure' containing a high concentration of
bioluminescent bacteria.
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