10 questions🇬🇧English
🌱 Photosynthesis – Year 9
Biology · Year 9 (KS3) — practise the photosynthesis equation, leaf structure and factors affecting the rate
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Questions
You add iodine solution to a leaf that contains starch. What colour does the iodine turn?
Purple
Orange-brown
Blue-black
Brick red
20s
In which part of a plant cell does photosynthesis take place?
Nucleus
Chloroplast
Vacuole
Mitochondrion
20s
Complete the word equation for photosynthesis: carbon dioxide + water → ?
Glucose + oxygen
Glucose + carbon dioxide
Oxygen + water
Starch + water
20s
Through which structures does carbon dioxide enter a leaf?
Root hair cells
Stomata
Waxy cuticle
Xylem vessels
20s
Which layer of a leaf contains the most chloroplasts?
Xylem
Palisade mesophyll
Upper epidermis
Spongy mesophyll
30s
Which is the correct balanced symbol equation for photosynthesis?
6CO₂ + 6H₂O → C₆H₁₂O₆ + 3O₂
CO₂ + H₂O → C₆H₁₂O₆ + O₂
6O₂ + 6H₂O → C₆H₁₂O₆ + 6CO₂
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
30s
When testing a leaf for starch, why is it placed in hot ethanol?
To remove the chlorophyll from the leaf
To break the starch down into glucose
To make the starch turn blue-black
To add water to the leaf cells
30s
A variegated leaf has green and white areas. After it is kept in light, it is tested for starch. What result is expected?
Only the green areas turn blue-black
The whole leaf turns blue-black
The whole leaf stays orange-brown
Only the white areas turn blue-black
30s
A plant is in bright light at its optimum temperature. More light does not raise the rate of photosynthesis. What is most likely limiting it?
Oxygen concentration
Light intensity
Glucose concentration
Carbon dioxide concentration
30s
The rate of photosynthesis falls sharply when the temperature rises well above about 40 °C. Why?
The enzymes involved are denatured
Oxygen is used up faster
Chlorophyll absorbs more light
Light intensity falls
30s