Photosynthesis IGCSE

What is the main purpose of photosynthesis?

• To produce oxygen for animals

• To create glucose for the plant

• To absorb sunlight for fun

• To use up all the water in the environment

What is the green pigment in plants that captures sunlight?

• Chloroplast

• Chlorophyll

• Glucose

• Starch

Photosynthesis happens in the chloroplasts of plant cells.

• TRUE

• FALSE

The word equation for photosynthesis is:

• Glucose + Oxygen → Carbon dioxide + Water

• Water + Carbon dioxide → Glucose + Oxygen

• Oxygen + Water → Carbon dioxide + Glucose

• Glucose + Carbon dioxide → Oxygen + Water

How is the glucose made during photosynthesis used by the plant?

• Stored as starch

• Used in respiration for energy

• Made into cellulose for cell walls

• All of the above

What are the three main limiting factors of photosynthesis?

• Light intensity, water, magnesium

• Light intensity, carbon dioxide, temperature

• Oxygen, temperature, sunlight

• Water, chlorophyll, light intensity

Plants need magnesium ions to make chlorophyll.

• TRUE

• FALSE

What gas is released as a byproduct of photosynthesis?

• Carbon dioxide

• Oxygen

• Nitrogen

• Hydrogen

During photosynthesis, plants use __________ to absorb sunlight.

• Roots

• Chlorophyll

• Flowers

• Stomata

Why are nitrate ions important for plants?

• For making starch

• For making amino acids and proteins

• For photosynthesis directly

• For absorbing water