Plant Hormones (AQA GCSE Biology): Quizzes

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Required Practical: Plant Growth
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What is the aim of this practical investigation?

Study effect of light or gravity on seedlings

Which control variables must be kept the same in the light experiment?

Temperature and water amount

Where should Group 2 Petri dishes be placed in the light experiment?

In a dark box or lightproof enclosure

How long should seedlings be observed in this practical?

Daily for a week

How should Petri dishes be positioned in the gravity experiment?

In a vertical position

What growth response do seedlings in light show?

Grow towards light (positive phototropism)

How do seedlings in darkness differ from those in light?

Taller and more spindly

In which direction do roots grow in the gravity experiment?

Downwards (positive gravitropism)

In which direction do shoots grow in the gravity experiment?

Upwards (negative gravitropism)

Where do auxins accumulate in phototropism?

On the shaded side

How do auxins affect root growth differently from shoot growth in gravitropism?

Inhibit root growth, promote shoot growth

What are potential sources of error in this practical?

Uneven light or inconsistent moisture

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