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Plants can convert the sugars made during photosynthesis into starch.

Unit 2 - Photosynthesis

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

1 .

Photosynthesis is a process in...

plants and animals

plants and fungi

plants and algae

bacteria

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

2 .

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

Carbon dioxide concentration

Oxygen concentration

Time

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

3 .

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

Respiration

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

4 .

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

Sodium

Magnesium

Phosphate

Nitrate

Proteins and amino acids contain nitrogen which enters the plant from the soil in the form of nitrate ions

5 .

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

Protein

Starch

Fructose

Cholesterol

Starch is made from long chains of glucose molecules that have been chemically joined together

6 .

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

Soil

Rivers

The sea

The air

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

7 .

Photosynthesis takes place in which part of a plant cell?

The nucleus

The mitochondria

The cell wall

The chloroplasts

This is where the chlorophyll is located

8 .

Photosynthesis requires which type of energy?

Heat

Electrical

Potential

Light

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

9 .

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

light intensity

temperature

water

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

10 .

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

Carbon dioxide

Hydrogen

Ammonia

Oxygen

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

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

Author: Donna Davidson (GCSE Biology Teacher & Examiner, Quiz Writer)

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