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How flowers make seeds

Science · Organisms & Life Processes · ages 12-13

Name ______________________ Date ____________

Which part of the flower protects the bud before it opens?
- Sepal
- Petal
- Carpel
Which part of the flower makes pollen?
- Stigma
- Anther
- Sepal
The carpel is the male part of a flower.
Circle one: True False
Why do insect-pollinated flowers usually make nectar?
- To attract insects that may carry pollen between flowers
- To move sugars from the flower down into its growing roots
- To make pollen light enough for the wind to carry it away
A flower has small, dull petals, no scent, and a feathery stigma hanging outside it to catch pollen from the air. What kind of pollination does it use?
- Insect pollination
- Self pollination only
- Wind pollination
Which change belongs at ? in the sequence?
- Pollen is transferred to a stigma
- The ovule develops into a seed
- A pollen tube grows towards an ovule
Seeds are landing in shade beneath their parent. Which pair correctly explains two ways fruits can carry seeds elsewhere?
- A winged fruit travels by wind; a hooked fruit travels on fur.
- A winged fruit travels on fur; a hooked fruit travels by wind.
- A winged fruit travels by water; a hooked fruit travels by wind.
Priya says, "Pollination and fertilisation are the same thing, since pollen just needs to land on the flower." Which statement distinguishes these stages correctly?
- Pollination joins sperm and egg nuclei inside an ovule; fertilisation transfers pollen from anther to stigma.
- Pollination and fertilisation both mean pollen moving from the anther to the stigma of the same flower.
- Pollination transfers pollen to the stigma; fertilisation joins sperm and egg nuclei inside an ovule.

Answer key

For grown-ups. Fold this page away before handing over the rest.

How flowers make seeds W1-mt_ck57CDFGet-s1

Sepal · Sepals cover and protect a flower while it is still a bud.
Anther · The anther sits on top of the stamen's filament and produces pollen.
False · The carpel is the female part. It holds the stigma, style, ovary, and ovules.
To attract insects that may carry pollen between flowers · Nectar is sugary food for visiting insects. As they feed and move between flowers, they may carry pollen to a stigma.
Wind pollination · An exposed, feathery stigma catches airborne pollen. Together with small petals and no scent, this points to wind pollination.
The ovule develops into a seed · After fertilisation, the ovule can develop into a seed. The ovary usually develops into fruit around the seeds before dispersal.
A winged fruit travels by wind; a hooked fruit travels on fur. · Wings help a light fruit travel on the wind. Hooks attach a fruit to animal fur. Both can carry seeds away from the parent's shade, though neither guarantees a suitable growing place.
Pollination transfers pollen to the stigma; fertilisation joins sperm and egg nuclei inside an ovule. · Pollen transfer to a stigma is pollination. Fertilisation happens later inside an ovule, when a sperm nucleus fuses with the egg cell's nucleus.