Photosynthesis Quiz Grade 4 Quiz - Free Test Questions

Question 1: Plants need three main things to make their food. What are they?

• A. Sunlight, water, and carbon dioxide
• B. Soil, worms, and oxygen
• C. Sugar, rain, and moonlight
• D. Sand, salt, and wind

Correct answer: Sunlight, water, and carbon dioxide

Question 2: Which part of the plant acts like a 'food factory' where photosynthesis mostly happens?

• A. The roots
• B. The stem
• C. The leaves
• D. The flowers

Correct answer: The leaves

Question 3: What is the name of the green stuff in leaves that captures energy from the sun?

• A. Leaf juice
• B. Chlorophyll
• C. Green glue
• D. Plant paint

Correct answer: Chlorophyll

Question 4: During photosynthesis, plants release a gas into the air that humans and animals need to breathe. What is it?

• A. Carbon dioxide
• B. Helium
• C. Nitrogen
• D. Oxygen

Correct answer: Oxygen

Question 5: Plants create a type of sugar for energy during photosynthesis. What is this 'plant food' called?

• A. Glucose
• B. Maple syrup
• C. Nectar
• D. Salty water

Correct answer: Glucose