How do flowering plants reproduce, from pollination to making a seed?
Describe the parts of a flower and explain pollination, fertilisation and seed formation in flowering plants
A scaffolded answer to the N(A)-Level Biology outcome on plant reproduction. The parts of a flower, the difference between pollination and fertilisation, and how a fertilised egg becomes a seed.
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What this dot point is asking
This outcome wants you to name the main parts of a flower, explain the difference between pollination and fertilisation, and describe how a fertilised ovule becomes a seed. You should be able to link the features of a flower to its method of pollination (insect or wind). The marks reward naming the parts, keeping pollination and fertilisation separate, and giving the steps in the right order.
The answer
The parts of a flower
A flower contains the male and female parts for reproduction:
- The male part is the stamen, made of the anther (which makes pollen) on a stalk called the filament.
- The female part is the carpel, made of the stigma (the sticky top that catches pollen), the style (a tube), and the ovary containing ovules (which become seeds).
- Petals surround these. In insect-pollinated flowers they are large and bright to attract insects.
Pollination
Pollination is the transfer of pollen from the anther (male) to the stigma (female). There are two main ways:
- Insect pollination: insects carry pollen between flowers. These flowers have large, bright, scented petals and nectar to attract insects, and sticky pollen and a sticky stigma.
- Wind pollination: the wind carries pollen. These flowers have small, dull petals, lots of light pollen, and feathery stigmas that hang out to catch pollen from the air.
Fertilisation
Fertilisation happens after pollination. The pollen grain grows a pollen tube down through the style to an ovule. The male nucleus then joins (fuses) with the female nucleus in the ovule. This is the actual joining of the sex cells, which pollination only set up by moving the pollen into place.
Seed and fruit formation
After fertilisation:
- The fertilised ovule becomes a seed, which contains the new young plant (embryo) and a food store.
- The ovary becomes the fruit, which protects the seeds and often helps spread them.
Examples in context
Example 1. Why bees matter to farming. Bees moving between flowers carry pollen and pollinate crops, which is needed before fruits and seeds can form. Many food crops depend on insect pollination, so a fall in bee numbers can reduce harvests. It shows insect pollination at work on a large scale.
Example 2. Why grasses have dangly, feathery flowers. Grasses are wind-pollinated, so their flowers are not bright or scented. Instead they have anthers that hang out to release clouds of light pollen and feathery stigmas to catch it from the air. It shows flower features matching the method of pollination.
Try this
Q1. Name the part of the flower that makes pollen. [1 mark]
- Cue. The anther.
Q2. State what pollination is. [2 marks]
- Cue. The transfer of pollen from the anther (male part) to the stigma (female part).
Q3. Explain what the ovule and the ovary become after fertilisation. [2 marks]
- Cue. The ovule becomes a seed, and the ovary becomes a fruit that protects the seeds.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original4 marksExplain the difference between pollination and fertilisation in a flowering plant.Show worked answer →
Pollination is the transfer of pollen from the anther (the male part) to the stigma (the top of the female part). It can be carried out by insects or by the wind.
Fertilisation happens after pollination. The pollen grows a tube down through the style to the ovule, and the male nucleus from the pollen joins (fuses) with the female nucleus in the ovule. So pollination is the transfer of pollen, while fertilisation is the actual joining of the male and female nuclei.
What markers reward: pollination as the transfer of pollen from anther to stigma, and fertilisation as the fusion of the male and female nuclei inside the ovule. The key idea is that pollination comes first and fertilisation follows. Treating the two words as the same is the main error.
Original4 marksDescribe two features of an insect-pollinated flower and explain how each helps with pollination.Show worked answer →
Feature 1: large, brightly coloured petals (often with a scent and nectar). These attract insects to visit the flower, so the insect can carry pollen.
Feature 2: sticky pollen and a sticky stigma inside the flower. The sticky pollen clings to the insect's body, and the sticky stigma catches the pollen when the insect visits another flower.
What markers reward: two correct features each linked to attracting insects or transferring pollen (bright petals/scent/nectar to attract; sticky pollen and stigma to stick to and catch on the insect). Wind-pollinated features (feathery stigma, lots of light pollen) would not score here.
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