Photosynthesis — making organic matter in leaves
Answers are for parents and teachers.
1
Draw a diagram of photosynthesis: inputs, conditions and outputs.
CO₂ + water, light + chlorophyll → sugar/starch + O₂.
2
Why should a houseplant be kept near a window? Write 2–3 sentences.
Photosynthesis needs light; without it the plant cannot make organic matter and turns yellow and weak.
3
Observe and record what a water plant (elodea) releases in light and in darkness.
In light many oxygen bubbles rise; in darkness almost none.
4
One sugar molecule needs 6 water molecules. How many water molecules do 7 sugar molecules need?
42
5
What conditions must be created to grow tomatoes in winter in a greenhouse? Name four factors.
Light (extra lamps), temperature, water and mineral salts (fertilizer); also CO₂.