Science L4 Photosynthesis and Food Chains and Webs

What is a reactant in a chemical reaction?

• The elements at the beginning of the chemical reaction, example hydrogen and oxygen

• The elements at the end of the chemical reaction, example water

What is a product in a chemical reaction?

• The result of the chemical reaction, example water

• The elements at the start of the chemical reaction, example hydrogen and oxygen

What do plants use to make oxygen?

• Sunlight

• Chlorine

• Soil

What are the reactants in this chemical reaction of photosynthesis?

• carbon dioxide and water

• glucose and oxygen

• sun energy

What are the products in this chemical reaction for photosynthesis?

• carbon dioxide and water

• solar energy

• glucose and oxygen

Where does photosynthesis take place?

• roots

• stem

• leaves

• branches

A food chain is a cycle in which animals or plants feed on one another.

• True

• False

Photosynthesis happens at night.

• True

• False

Plants need the following so that photosynthesis can occur:

• Sunlight, water, carbon dioxide, leaves

• Sunlight, oxygen, water, soil, roots

Does energy transfer in a food chain?

• Yes

• No