The seed and its composition
Answers are for parents and teachers.
1
Draw the internal structure of a bean seed and a wheat grain and name the parts.
Bean: coat, 2 cotyledons, embryo; wheat: coat + fruit wall, endosperm, embryo (1 cotyledon).
2
Group 5 kinds of seeds at home (rice, bean, sunflower, peanut, pea) by their main substance.
Starch: rice; protein: bean, pea; oil: sunflower, peanut.
3
Crush a sunflower seed on white paper, record the result and explain what it proves.
A greasy stain remains — the seed contains oil.
4
If one cotton seed carries about 20000 fibres (approximate), how many fibres are on 3 seeds?
60000
5
Why should seeds be stored in a dry, cool place? Write 2–3 sentences.
In damp warmth seeds sprout or go mouldy; dry storage keeps them dormant.