6 plant structures and their functions
闪卡自测
Why do plants produce plant hormones?
所有闪卡
闪卡 1
问题
Why do plants produce plant hormones?
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答案
Plants produce hormones in order to coordinate and control growth and development.
闪卡 2
问题
Why do plants need to respond to stimuli such as light and gravity?
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答案
Plants need to respond to stimuli to ensure that they can maximise their growth, e.g.
闪卡 3
问题
Define the term phototropism.
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答案
Phototropism is the directional growth of plants in response to light, allowing shoots to grow towards light to optimise photosynthesis.
闪卡 4
问题
Define the term gravitropism (or geotropism).
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答案
Gravitropism, also known as geotropism, is the directional growth response of plants in relation to gravity; roots grow downwards and shoots grow upwards.
闪卡 5
问题
True or False? Unequal distribution of auxin results in uneven growth in plant shoots and roots.
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答案
True. Auxin distributes itself unevenly in shoots and roots due to the direction of light and gravity. This uneven auxin distribution results in uneven growth.
闪卡 6
问题
What effect does auxin have on cells in the shoots of plants?
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答案
Auxin stimulates cell elongation in plant shoots.
闪卡 7
问题
How does auxin distribution in response to light lead to phototropism?
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答案
Auxin accumulation on the shaded side of a shoot causes cells on the shady side to elongate at a faster rate than cells on the light side; this leads to bending of the shoot towards the light.
闪卡 8
问题
True or False? Auxin inhibits the growth of cells in plant roots.
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答案
True. Auxin accumulates on the lower side of plant roots, inhibiting cell growth and causing roots to bend downwards towards gravity.
闪卡 9
问题
True or False? Auxins can be used in agriculture as a weedkiller. (Higher Tier Only)
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答案
True. Auxins can be used as weedkillers in agriculture; this is because they cause broad-leaved weed species to die while allowing narrow-leaved crop species to grow normally.
闪卡 10
问题
How can auxins aid the production of new plants? (Higher Tier Only)
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答案
Auxins can aid the production of new plants when it is added to:
闪卡 11
问题
How are gibberellins used in the plant growing industry? (Higher Tier Only)
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答案
Gibberellins can be used to:
闪卡 12
问题
True or False? Ethene prevents fruit ripening. (Higher Tier Only)
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答案
False. Ethene causes fruit ripening. In the food industry the ripening of fruits can therefore be slowed by inhibiting ethene production.