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KS3 Biology:



10 minutes maximum! (can you do it in 5?)


1. Plants and some other organisms use the process of photosynthesis.

Which of theses sentences gives the best definition of photosythesis?

  • A. The process of producing food in a chemical reaction using the energy from sunlight
  • B. The process of organisms taking in nutrients and water
  • C. The process of plants getting rid of waste products
  • D. The process of cells obtaining energy from glucose through a chemical reaction.

2-4: Can you complete the chemical word equation for photosynthesis shown here?

carbon dioxide + arrow +

5. Where in a plant does photosynthesis take place?

  • A. in the roots
  • B. in the branches
  • C. in flowers
  • D. in leaves

6. A chemical is present in plants that is vital for photsynthesis. it is green and gives all plants their green colour. What is this chemical called?

  • A. chlorine
  • B. glucose
  • C. photochrome
  • D. chlorophyll

7. Many plant cells have structures containing this chemical. What are these structures called?

  • A. cytoplasm
  • B. chloroplasts
  • C. mitochondria
  • D. cell membranes

8. Water is a vital part of the photosynthesis process. Where in a plant does this water come from?

  • A. From leaves which absorb water from the air.
  • B. From root hair cells which absorb water from the soil.
  • C. From flowers which collect water from the rain.
  • D. From the stem / trunk / branches of the plant or tree when it rains.

9+10. Leaves have many adaptations that help photosynthesis to take place.

female sprinter

9. Which of these is NOT an adaptation that supports photosynthesis?

  • A. leaves are thin so that gases can easily diffuse in and out of the leaf cells
  • B. leaves have thin tubes (xylem) to supply water to the cells
  • C. leaves have a curved surface to help collect water
  • D. leaves have a large surface area to collect sunlight for photosynthesis

10. What are 'stomata'?

  • A. holes in the underside of the leaf where carbon dioxide gas enters
  • B. holes in the top of the leaf where oxygen gas enters
  • C. thin tubes (vessels) that transport glucose around the plant
  • D. the points in the leaf where sunlight is collected and photosynthesis occurs