Photosynthesis in Plants: A GCSE Biology Revision Quiz

Biology Quiz - Unit 2 - Photosynthesis (Questions)

This GCSE Biology quiz on photosynthesis checks how plants use light, carbon dioxide, and water to make glucose, and how this process supports respiration, growth, and storage.

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Fascinating Fact:

Glucose made in photosynthesis can be used immediately in respiration, or converted to starch for storage in leaves, stems, or roots.

In GCSE Biology, photosynthesis explains how plants trap light energy in chloroplasts to make glucose. You learn the word equation, limiting factors, and how plants use and store the glucose produced.

Key Terms

Photosynthesis: A process in green plants that uses light energy to convert carbon dioxide and water into glucose and oxygen.
Chloroplast: A plant cell organelle containing chlorophyll where photosynthesis takes place.
Limiting factor: A factor such as light intensity, temperature, or carbon dioxide concentration that can slow the rate of photosynthesis.

Frequently Asked Questions (Click to see answers)

What is the word equation for photosynthesis?

The word equation for photosynthesis is: carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll in the chloroplasts of plant cells.

Why is chlorophyll important for photosynthesis?

Chlorophyll is important because it absorbs light energy from the Sun. This energy is then used to drive the chemical reactions that make glucose during photosynthesis.

How do limiting factors affect photosynthesis in GCSE Biology?

In GCSE Biology, limiting factors such as low light intensity, low carbon dioxide concentration, or unsuitable temperature reduce the rate of photosynthesis and so less glucose is produced.

Try These Related Quizzes

Photosynthesis is a process in...

[ ]	plants and animals
[ ]	plants and fungi
[ ]	plants and algae
[ ]	bacteria

Photosynthesis takes place in which part of a plant cell?

[ ]	The nucleus
[ ]	The mitochondria
[ ]	The cell wall
[ ]	The chloroplasts

Which very important gas is given off as a by-product of photosynthesis?

[ ]	Carbon dioxide
[ ]	Hydrogen
[ ]	Ammonia
[ ]	Oxygen

Photosynthesis requires which type of energy?

[ ]	Heat
[ ]	Electrical
[ ]	Potential
[ ]	Light

Where does the water needed for photosynthesis usually come from in plants?

[ ]	Soil
[ ]	Rivers
[ ]	The sea
[ ]	The air

Various factors can limit the rate of photosynthesis. Which of these variables can limit photosynthesis?

[ ]	Carbon dioxide concentration
[ ]	Oxygen concentration
[ ]	pH
[ ]	Time

If the rate of photosynthesis is reduced, which of the following important processes is also reduced?

[ ]	Respiration
[ ]	Growth
[ ]	Reproduction
[ ]	Excretion

Farmers will use heated greenhouses for faster growth of crops. This increases photosynthesis by increasing the...

[ ]	pH
[ ]	light intensity
[ ]	temperature
[ ]	water

Plants can convert the sugars made during photosynthesis into which insoluble stored form of energy?

[ ]	Protein
[ ]	Starch
[ ]	Fructose
[ ]	Cholesterol

10.

Plants can convert sugars into protein using which mineral ion obtained from the soil?

[ ]	Sodium
[ ]	Magnesium
[ ]	Phosphate
[ ]	Nitrate

You can find more about this topic by visiting BBC Bitesize - Photosynthesis

Biology Quiz - Unit 2 - Photosynthesis (Answers)

Photosynthesis is a process in...

[ ]	plants and animals
[ ]	plants and fungi
[x]	plants and algae
[ ]	bacteria

Animals cannot photosynthesise and rely on plants to provide their food either directly (herbivores) or indirectly by eating other animals

Photosynthesis takes place in which part of a plant cell?

[ ]	The nucleus
[ ]	The mitochondria
[ ]	The cell wall
[x]	The chloroplasts

This is where the chlorophyll is located

Which very important gas is given off as a by-product of photosynthesis?

[ ]	Carbon dioxide
[ ]	Hydrogen
[ ]	Ammonia
[x]	Oxygen

Oxygen makes up about 20% of the air we breathe. Plants and algae are responsible for producing the oxygen we need!

Photosynthesis requires which type of energy?

[ ]	Heat
[ ]	Electrical
[ ]	Potential
[x]	Light

The light energy is trapped by chlorophyll molecules which are packed into the chloroplasts

Where does the water needed for photosynthesis usually come from in plants?

[x]	Soil
[ ]	Rivers
[ ]	The sea
[ ]	The air

Root hairs absorb the water needed by the plant for photosynthesis from the soil

Various factors can limit the rate of photosynthesis. Which of these variables can limit photosynthesis?

[x]	Carbon dioxide concentration
[ ]	Oxygen concentration
[ ]	pH
[ ]	Time

In practice, there is normally sufficient carbon dioxide in the atmosphere to keep plants fully supplied

If the rate of photosynthesis is reduced, which of the following important processes is also reduced?

[ ]	Respiration
[x]	Growth
[ ]	Reproduction
[ ]	Excretion

Photosynthesis makes sugars which are then used to make the biomass of the plant itself. More photosynthesis means more sugars which can be used to grow a bigger plant

Farmers will use heated greenhouses for faster growth of crops. This increases photosynthesis by increasing the...

[ ]	pH
[ ]	light intensity
[x]	temperature
[ ]	water

Photosynthesis is a series of chemical reactions. Chemical reactions usually increase in speed as temperature is increased