RP8 - Plant Responses Flashcards

1
Q

Describe how you would investigate the effect of light on the growth of newly germinated seedlings

A

● Incubate seeds in 3 Petri dishes and allow them to germinate
● Place one dish in full sunlight, one in partial sunlight and one
in complete darkness
● Measure the height of each seedling every day for a week
and calculate the mean height for each day
● Plot graph of mean seedling height (y) against day (x)

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2
Q

Which group of seedlings would you expect to grow the most and why?

A

The group in full sunlight - light is required for photosynthesis and these plants will not have light intensity as a limiting factor

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3
Q

What growth substance in plants is affected by light?

A

Auxins - the distribution of auxins in seedling stems is affected by light. This impacts the seedling’s direction of growth

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4
Q

Why is it necessary to find the mean height of the seedlings?

A

Some seedlings may be much shorter/longer than others in the same dish - calculating a mean makes the values more representative and allows comparison between groups

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