Photosynthesis

What is the correct balanced symbol equation for photosynthesis?

• C₆H₁₂O₆ + CO₂ → 6 O₂ + 6 H₂O

• CO₂ + H₂O → CH₂O + O₂

• 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

• 6 O₂ + 6 H₂O → C₆H₁₂O₆ + 6 CO₂

What type of reaction is photosynthesis?

• Aerobic

• Endothermic

• Exothermic

• Oxidation

What are the two products of photosynthesis?

• Carbon dioxide

• Chlorophyll

• Glucose

• Oxygen

• Water

What is the name of the chemical that makes a leaf look green?

• Cellulose

• Chlorophyll

• Chloroplast

• Chromosome

What is the correct word equation for photosynthesis?

• carbon dioxide  +  glucose  →   oxygen  +  water

• glucose  +  oxygen  →  carbon dioxide  +  water

• oxygen  +  water   →  carbon dioxide  +  glucose

• water  +  carbon dioxide   →  oxygen  +  glucose

Where does the energy for photosynthesis come from?

• Light

• Osmosis

• Respiration

What will happen to the rate of photosynthesis if the temperature is decreased?

• decrease

• increase

• stay the same

At which light intensity was light a limiting factor for photosynthesis?

• 1 arbitrary unit

• 4 arbitrary units

• 10 arbitrary units

 What was the highest rate of photosynthesis?

• 210 arbitrary units

• 220 arbitrary units

• 0 arbitrary units

A group of pupils investigated the way in which the colour of light affects photosynthesis.

The pupils:

•        put a piece of pondweed into a test tube of water

•        shone light from a lamp with a red light bulb onto the pondweed

•        counted the bubbles of gas produced by the pondweed every minute for three minutes.

The pupils repeated their experiment using a yellow light bulb, a green light bulb and a blue light bulb.

What was the independent variable in the investigation?

• Colour of light

• Number of bubbles of gas produced in 3 minutes

• Piece of pondweed