Science 5 · Unit 1: Life cycles of flowering plants · Cambridge Primary Science Stage 5

Questions

1. 1. What is seed dispersal?

   • when the ovary becomes a fruit
   • when a seed starts to grow
   • when pollen moves to the stigma
   • spreading seeds away from the parent plant
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2. 2. Why must seeds be spread away from the parent plant?

   • Seeds need to be cold.
   • Seedlings need room, light and water to grow.
   • Parent plants eat seeds.
   • Seeds can't grow in soil.
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3. 3. How are juicy, colourful fruits dispersed?

   • They blow in the wind.
   • They float on water.
   • They explode.
   • Animals eat them and the seeds pass out in their droppings.
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4. 4. Seeds with spines and hooks are dispersed by ...

   • floating on water
   • exploding
   • sticking to animals' fur
   • the wind
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5. 5. How is a dandelion seed adapted for wind dispersal?

   • It has hooks.
   • It has a parachute of hairs.
   • It is heavy and round.
   • It has a spongy coat.
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6. 6. How are coconuts dispersed?

   • by exploding
   • by sticking to fur
   • by wind
   • by water
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7. 7. How does a spongy covering help a water lily disperse its seeds?

   • It helps the seed float away.
   • It sticks to animals.
   • It makes it explode.
   • It makes it heavy.
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8. 8. How do bean pods disperse their seeds?

   • Animals eat them.
   • They dry out and explode.
   • They float.
   • They have parachutes.
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9. 9. Why are bean pods usually picked before the weather gets hot and dry?

   • so they grow bigger
   • so birds can eat them
   • so they float
   • so they don't explode and lose their seeds
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10. 10. How do mangrove seeds travel?

    • They explode.
    • They roll down hills.
    • They float upright in the sea.
    • They blow in the wind.
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11. 11. Apples drop and roll. How else can apple seeds be spread?

    • by parachutes
    • by floating in rivers
    • by exploding
    • by animals that eat the fallen fruit
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12. 12. How is a sycamore seed adapted for dispersal?

    • It has thin papery wings to spin in the wind.
    • It explodes.
    • It has hooks.
    • It floats.
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13. 13. How does a poppy disperse its seeds?

    • The wind shakes seeds out of holes in its 'pepper pot' fruit.
    • It floats.
    • Its seeds have hooks.
    • Animals eat it.
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14. 14. Which tomato's seeds will probably grow better - one left on the plant or one eaten by a bird?

    • the one left on the plant
    • the one eaten by a bird
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15. 15. A dandelion seed stayed in the air 22 seconds on average, a sycamore 10 seconds. Which is better dispersed by wind?

    • dandelion
    • sycamore
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16. 16. One reading was 7 seconds when the others were 15 and 14. What should Ahmed and Yaseen do?

    • repeat that measurement
    • ignore all the readings
    • use only that reading
    • stop the investigation
    Check