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Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. Which part of a flower makes pollen?

    • The ovary
    • The anther
    • The stigma
    • The sepal

  2. What is pollination?

    • The growth of a pollen tube
    • The joining of a male nucleus and a female nucleus
    • The transfer of pollen from an anther to a stigma
    • The spreading of seeds away from the parent plant

  3. Which feature shows that a flower is pollinated by the wind?

    • Sticky pollen
    • A strong, sweet scent
    • Large, brightly coloured petals
    • Feathery stigmas that hang outside the flower

  4. How does the male nucleus get from the stigma to an ovule?

    • The wind blows it there
    • A bee carries it there
    • Down a pollen tube that grows through the style
    • It falls down a hole in the style

  5. What happens at fertilisation?

    • A seed is carried away
    • A male nucleus joins with a female nucleus
    • A fruit splits open
    • Pollen lands on the stigma

  6. After fertilisation, what does the ovary become?

    • The embryo
    • A seed
    • A petal
    • The fruit

  7. Which part of a seed grows into the new plant?

    • The fruit
    • The embryo
    • The food store
    • The seed coat

  8. A fruit is covered in tiny hooks. How are its seeds dispersed?

    • By the pod exploding
    • By the wind
    • By water
    • On the fur of animals

  9. Why does a plant need to disperse its seeds?

    • So the seeds can be pollinated
    • So the young plants do not compete with the parent for light, water and minerals
    • So the parent plant can make more pollen
    • So the seeds dry out

  10. A student changes the wing length of a paper spinner and measures how far it travels. What is the independent variable?

    • The height of the drop
    • The wing length
    • The distance travelled
    • The speed of the fan
Answers
  1. The anther. The anther is at the top of a stamen, the male part of the flower.
  2. The transfer of pollen from an anther to a stigma. Pollination moves pollen from the male part of a flower to the female part.
  3. Feathery stigmas that hang outside the flower. A feathery stigma catches pollen that drifts past on the air. The other three attract or use insects.
  4. Down a pollen tube that grows through the style. A pollen tube grows out of the pollen grain, down the style and into the ovule.
  5. A male nucleus joins with a female nucleus. Fertilisation is the joining of the two nuclei. It happens inside an ovule.
  6. The fruit. The ovary becomes the fruit. The fertilised ovules inside it become the seeds.
  7. The embryo. The embryo is the young plant. The food store feeds it and the seed coat protects it.
  8. On the fur of animals. The hooks catch on the fur of a passing animal, which carries the seeds away.
  9. So the young plants do not compete with the parent for light, water and minerals. Seeds that grow far from the parent, and from each other, have less competition.
  10. The wing length. The independent variable is the one you change. The distance is the dependent variable: the one you measure.