Welcome to the Quiz!

This quiz contains 10 questions from a mix of 1 subtopics.

What is the primary benefit of phototropism for a plant?

to obtain nutrients and minerals

to anchor the plant in the soil

to maximise light capture for photosynthesis

to respond to physical contact

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What type of tropism occurs when shoots grow towards the light?

positive phototropism

negative phototropism

positive geotropism

negative geotropism

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What type of tropism is occurring when roots grow downwards?

positive geotropism

positive phototropism

negative chemotropism

negative hydrotropism

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Which plant hormone plays a central role in directing phototropism and geotropism?

cytokinin

auxin (IAA)

gibberellin

ethylene

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During negative phototropism and positive geotropism in roots, where does IAA become concentrated?

the upper side of the root

equally throughout the root

in the shoot tip

the lower, shaded side of the root

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What effect does the concentration of IAA have on the lower, shaded side of a root during negative phototropism and positive geotropism?

it inhibits cell elongation

it stimulates cell elongation

it causes the root to bend towards the light

it has no effect on cell elongation

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What is etiolation?

the rapid upward growth that takes place in a plant grown in the dark

the bending of a plant in response to touch

the bending of a plant towards the light

the bending of a plant towards gravity

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What hormone is responsible for the extreme elongation of internodes during etiolation?

gibberellin

auxin (IAA)

ethylene

cytokinin

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What type of tropism occurs when roots grow away from light?

positive geotropism

negative phototropism

positive phototropism

negative geotropism

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Explain the role of IAA in the control of positive phototropism in shoots.

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