Grade 3 · Science · Unit 2 of 10
How Plants Grow & Change
Life cycles, seeds, and making food from sunlight
What your child practises
From seed to flower and back to seed, how seeds travel, how plants react to light and seasons, and how they use sunlight, water and carbon dioxide to make food and release oxygen.
Ontario Curriculum expectation: B2.3, B2.4, B2.5 · life cycles, how plants adapt and react to their surroundings, and photosynthesis
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
When a seed starts to grow into a new plant, it is…
🌱- migrating
- hibernating
- germinating
- pollinating
Show answer
germinating
Hint: Germination is when a seed sprouts.
Question 2
How does the seed travel? Tap an item, then tap its basket.
Sort into: 🌬️ carried by the wind · 🐿️ carried by animals
- 🐿️acorn buried by a squirrel
- 🌳cottonwood fluff
- 🌿milkweed fluff
- 🐦berry eaten by a bird
- 🐻raspberry eaten by a bear
- 🍁maple key (a seed with a wing)
Show answer
🌬️ carried by the wind: cottonwood fluff, milkweed fluff, maple key (a seed with a wing) · 🐿️ carried by animals: acorn buried by a squirrel, berry eaten by a bird, raspberry eaten by a bear
Hint: Light fluffy or winged seeds ride the wind. Sticky burrs and tasty fruits travel with animals.
Question 3
What gas do plants take in from the air to make food?
🍃- oxygen
- carbon dioxide
- helium
- smoke
Show answer
carbon dioxide
Hint: Plants take in carbon dioxide and release oxygen.
Question 4
A sunflower turns to face the Sun during the day. This is an example of a plant…
🌻- being pollinated
- changing its life cycle
- making seeds
- reacting to its environment
Show answer
reacting to its environment
Hint: The plant responds to light by moving.
Question 5
Put the life cycle of a bean plant in order. Tap the first stage first.
- 🌿seedling with leaves
- 🌱seed sprouts
- 🌼plant with flowers
- 🫘pods with new seeds
- 🌰seed
Show answer
seed → seed sprouts → seedling with leaves → plant with flowers → pods with new seeds
Hint: A seed sprouts into a seedling, grows leaves, flowers, and makes new seeds.
Question 6
Chlorophyll gives leaves their green colour. What else does it do?
🍃- helps the leaf capture sunlight
- makes the leaf smell sweet
- stops the leaf from falling
- pulls water up from the roots
Show answer
helps the leaf capture sunlight
Hint: Chlorophyll catches sunlight so the plant can make food.