We will learn

1

• We will learn
• The factors that affect the rate of plant growth.
• The idea of limiting factors.

Describe the pattern that the graph
shows. Explain why the number of bubbles rises at
first. Explain why the number of bubbles then
stays the same. How could you get the plant to
make more than 60 bubbles per minute?
2

• We will learn
• The factors that affect the rate of plant growth.
• The idea of limiting factors.

3

• We will learn
• The factors that affect the rate of plant growth.
• The idea of limiting factors.

4

• We will learn
• The factors that affect the rate of plant growth.
• The idea of limiting factors.

Carbon dioxide Water Temperature Light Colour of
light
It is needed for photosynthesis and it helps the
plant support its leaves
It is a raw material for photosynthesis
Chlorophyll can only absorb some types of light
It provides energy for the chemical reaction
It speeds up or slows down chemical reactions
5
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6
What will the gas at X be?
7
Why did this covered leaf only have starch in its
middle?
8
What would you see if this leaf was tested for
starch?
9
Which leaf will have starch in it?
10
The graph shows how chlorophyll absorbs different
wavelengths of light. Why are trees green?
11
The indicator is red. It turns yellow when carbon
dioxide is added or purple when carbon dioxide is
taken from it. What colour will each experiment
go?
12
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13
Say why you think that each step is needed when
you tested the leaf for starch. I boiled the leaf
in water first so that
14
What do the results show about the leaf?