Page 152 - Knowledge Organiser Yr8 24-25

Knowledge Base: Science 8.12 Plants and Photosynthesis Year 8
1. Photosynthesis
1.1
What are the reactants in photosynthesis?
Carbon dioxide and water.
1.2
What are the products in photosynthesis?
Oxygen and glucose.
1.3
Write the word equation for photosynthesis.
Carbon dioxide + water → glucose + oxygen.
1.4
Where in the plant cell does photosynthesis take place?
In the chloroplasts.
1.5
What is the name of the green pigment found inside chloroplasts?
Chlorophyll.
1.6
What is the function of chlorophyll?
To absorb sunlight.
6. Climate Change
4.1 Why do plants need water?
4.2 Where does water diffuse into plants?
For photosynthesis.
Root hair cells in the roots.
4.3
What structures transport water around the plant?
Xylem.
4.4
How is water drawn up through the plant?
By water evaporating from the leaves.
4.5
Where do plants get the minerals they need?
From the soil.
4.6 Why do plants need nitrates?
4.7 Why do plants need phosphates?
4.8 Why do plants need potassium?
4.9 Why do plants need magnesium?
For healthy growth.
For healthy roots.
For healthy leaves and flowers. For making chlorophyll.
2. Starch Test
2.1
What do plants convert glucose into for storage?
Starch.
2.2
What colour does iodine turn if there is starch present?
Turns from brown to blue-black.
3. Investigating Photosynthesis
3.1
When green plants and algae photosynthesises, is carbon dioxide used up or released?
Used up.
3.2
True/False: Green plants and algae cells carry out aerobic respiration.
True.
3.3
When green plants and algae respire, is carbon dioxide used up or produced?
Produced.
3.4
What chemical is used to detect increases
and decreases in carbon dioxide concentration in water?
Hydrogen carbonate indicator
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