Review the process of photosynthesis with this Grade 9 science worksheet.
Students will complete fill-in-the-blank questions about sunlight, carbon dioxide, glucose, and chloroplasts while learning how plants produce food
Photosynthesis — Practice
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Try these before or after you print the worksheet. The printable asks you to fill in the words. This asks what goes in and what comes out — and how that compares with cellular respiration, which runs the same equation backwards.
Question 1 — put them in order
Click these in order, following a photon of sunlight through.
Light → chloroplast → raw materials combined → food and oxygen out. The chloroplast is where the energy is captured; the sugar is what the energy ends up stored in.
Question 2
Which two things does a plant take in for photosynthesis?
Carbon dioxide and water — one from the air, one from the soil. Oxygen and glucose are what come out.
Question 3
Where in a plant cell does photosynthesis happen?
Chloroplasts — the structures that make plant cells green and that animal cells do not have.
Question 4
What is released into the air during photosynthesis?
Oxygen. It is a by-product as far as the plant is concerned — the plant is after the glucose. The oxygen is simply left over, which is a striking thing to think about.
Question 5
Photosynthesis and cellular respiration are often described as opposites. Why?
The inputs and outputs are swapped. Photosynthesis takes carbon dioxide and water and makes glucose and oxygen; respiration does the reverse. Plants do both.
Question 6 — select all that apply
Select every product of photosynthesis, then press Check.
Glucose, oxygen and the energy stored in that sugar. Carbon dioxide and water are the ingredients going in, not the results coming out.
Think about it
Plants make their own food. What does that make them, compared with animals?
Photosynthesis needs light. What do you think happens in a plant at night?
The oxygen you are breathing was made by photosynthesis. Where did the carbon in the plant come from?