Auxins are plant hormones. (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer. Auxins cause the shoot of a plant to grow towards light in a process called ☐ A negative gravitropism ☐ B negative phototropism ☐ C positive gravitropism ☐ D positive phototropism (ii) Explain how auxins cause the shoot of a plant to grow towards light.

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Auxins are plant hormones - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1

Question 5

Auxins are plant hormones. (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer. Auxins cause the shoot of a plant to grow towards l... show full transcript

Worked Solution & Example Answer:Auxins are plant hormones - Edexcel - GCSE Biology - Question 5 - 2013 - Paper 1

Step 1

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

The correct answer is D positive phototropism. This term denotes the growth response of a plant shoot towards light.

Step 2

Explain how auxins cause the shoot of a plant to grow towards light.

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Answer

Auxins are plant hormones that play a crucial role in directing growth responses. When light is shone on one side of a plant shoot, auxins move to the shaded side of the shoot. This unequal distribution of auxins causes the cells on the shaded side to elongate more than those on the light-exposed side. As a result, the shoot bends towards the light, an adaptive response that optimizes light capture for photosynthesis.

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