• Quick retrieval from earlier learning (Plants make food from air and water). Students answer on mini whiteboards.
• Show answers together and note who needs support in the main task.

1. How plants grow: which statement is true? (Plants release oxygen into the air. / Plants take in oxygen and give out only carbon dioxide all day. / Plants do not need light to make food. / The energy in plant food comes from the soil.) → Plants release oxygen into the air.Prompt: Where does a tree's wood really come from?
2. In a famous experiment, a willow tree grew by 74 kg in 5 years, but the soil lost only about 0.06 kg. What does this show? (Trees do not grow. / Trees eat soil. / The tree's mass did not mainly come from the soil. / The soil got heavier.) → The tree's mass did not mainly come from the soil.Prompt: Compare how much the tree gained with how much soil was lost.
3. How plants grow: which statement is NOT true? (Plants make their own food using light energy. / Most of a plant's mass comes from carbon dioxide in the air and from water. / Plants get most of their mass by eating soil. / Plants release oxygen into the air.) → Plants get most of their mass by eating soil.Prompt: One sentence repeats an old idea that experiments disproved.

• Bring in a plant that has been kept in the dark next to one in the light, and ask what happened.
• Share the objective: Photosynthesis. Read the success criteria together.

• Work through the example out loud, saying why you do each step, not just what you do.
• Example: What does chlorophyll do?
• Step 1: Chlorophyll absorbs light energy, which is used to make glucose.
• Step 2: So the answer is: absorbs light energy
• Answer: absorbs light energy
• Pause after each step and ask a student to say what comes next.

• Do these together. Students try each step on whiteboards before you reveal it.
• Use the hints as prompts rather than giving the answer.

1. Complete the word equation: carbon dioxide + ___ → glucose + oxygen (oxygen / water / glucose / soil) → waterPrompt: The roots take this in.
2. Pondweed in light gives off 18 bubbles of oxygen in 2 minutes. What is the rate in bubbles per minute? → 9Prompt: Rate = amount ÷ time.

• Students work on the student sheet. Circulate and check the first two answers of every student early.
• Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

• Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.

1. Photosynthesis: which statement is NOT true? (Glucose is made in the soil and taken up by roots. / Photosynthesis produces oxygen. / Chlorophyll is found in chloroplasts. / Photosynthesis takes in energy (it is endothermic).) → Glucose is made in the soil and taken up by roots.Prompt: Remember the word equation.
2. Pondweed in light gives off 20 bubbles of oxygen in 2 minutes. What is the rate in bubbles per minute? → 10Prompt: Rate = amount ÷ time.

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-7.