Who this is for: Cambridge IGCSE Coordinated Science (0654) students who want plant sexual reproduction — flower structure, pollination and fertilisation — to become reliable marks instead of a labelled diagram they cannot explain.
What query it owns: how to understand and revise sexual reproduction in plants in Cambridge IGCSE Coordinated Science.
Why this is safe: this page owns the plant-sexual-reproduction revision-guide angle, while Tutopiya’s Sexual Reproduction in Plants subtopic page owns the learning resource and the free Sexual Reproduction in Plants quiz owns the practice.

Flowering plants reproduce sexually through pollination (transfer of pollen from anther to stigma) followed by fertilisation (fusion of male and female gamete nuclei in the ovule). Cambridge IGCSE Coordinated Science (0654) tests flower structure, insect- vs wind-pollinated adaptations, and the sequence from pollination to seed formation. This guide covers the syllabus definitions, comparison tables examiners expect, and the question types that appear every year.

Key takeaways

• Stamen = anther + filament (produces pollen); carpel = stigma + style + ovary (contains ovules).
• Pollination is transfer of pollen from anther to stigma; fertilisation is fusion of gamete nuclei inside the ovule.
• Insect-pollinated flowers: colourful petals, scent, nectar, sticky stigma; wind-pollinated: small dull petals, exposed anthers, feathery stigma.
• Self-pollination transfers pollen within the same flower; cross-pollination between flowers (more variation).
• After fertilisation, the ovule becomes a seed and the ovary wall becomes the fruit.

What is sexual reproduction in plants in Cambridge IGCSE Coordinated Science?

Sexual reproduction in flowering plants involves male gametes in pollen grains and female gametes in ovules. Pollination delivers pollen to the stigma; a pollen tube grows down the style so the male nucleus can fuse with the female nucleus in the ovule. The fertilised ovule develops into a seed; the ovary develops into a fruit that aids seed dispersal.

You can read the full explanation, labelled diagrams and notes on Tutopiya’s Sexual Reproduction in Plants subtopic page before you attempt questions.

The core ideas you must master

Idea	What it means	How the exam uses it
Anther	Produces pollen (male gametes)	“State the function of the anther.”
Stigma	Receives pollen	”Describe pollination.”
Ovule	Contains female gamete	”State where fertilisation occurs.”
Pollination	Pollen transfer to stigma	”Distinguish pollination and fertilisation.”
Seed / fruit	Ovule → seed; ovary → fruit	”Describe seed formation.”

Flower structure — male and female parts

Part	Structure	Function
Sepals	Green leaf-like outer ring	Protect flower bud
Petals	Often coloured	Attract insects (in insect-pollinated flowers)
Stamen	Anther on filament	Produce and release pollen
Carpel	Stigma, style, ovary	Stigma catches pollen; ovary contains ovules

Insect-pollinated vs wind-pollinated flowers

Feature	Insect-pollinated	Wind-pollinated
Petals	Large, brightly coloured	Small, dull or absent
Scent / nectar	Present	Absent
Anthers	Inside flower, less exposed	Hang outside, exposed to wind
Stigma	Sticky, inside flower	Feathery, hangs outside
Pollen	Sticky, fewer grains	Light, smooth, produced in large amounts
Examples	Rose, buttercup	Grasses, maize

Plant reproduction in past-paper wording

Command word	What the question wants	Typical stem
Define	Precise syllabus definition	”Define pollination.”
State	Short factual answer	”State the function of the ovary.”
Describe	Structure or process step by step	”Describe the path of a pollen grain to fertilisation.”
Explain	Cause and effect	”Explain how a wind-pollinated flower is adapted.”
Compare	Similarities and differences	”Compare insect- and wind-pollinated flowers.”

Worked exam-style stems

1. “Define pollination.” Pollination is the transfer of pollen grains from the anther to the stigma. Reward: transfer + pollen + anther to stigma.
2. “Distinguish pollination and fertilisation.” Pollination is transfer of pollen to the stigma; fertilisation is the fusion of the male and female gamete nuclei in the ovule. Reward: two distinct processes.
3. “Describe two adaptations of an insect-pollinated flower.” Brightly coloured petals to attract insects; nectar and scent to reward and guide insects; sticky stigma to retain pollen. Reward: adaptation + linked function for each.

Practise on the Sexual Reproduction in Plants quiz.

How plant reproduction connects to the syllabus

Plant sexual reproduction links to Asexual and Sexual Reproduction and Variation and Selection (cross-pollination increases variation). The Cambridge IGCSE Coordinated Science resource hub links every Reproduction subtopic.

Common mistakes students make

• Confusing pollination with fertilisation.
• Saying fertilisation occurs on the stigma (it occurs in the ovule).
• Describing wind-pollinated flowers as having bright petals and nectar.
• Forgetting that the ovule becomes the seed and the ovary becomes the fruit.
• Labelling the anther as producing seeds (it produces pollen).

When you need more support

If pollination and fertilisation questions keep costing marks, work through the Sexual Reproduction in Plants quiz, then get help from a Cambridge IGCSE Coordinated Science tutor.

Frequently asked questions

What is the difference between pollination and fertilisation? Pollination is transfer of pollen to the stigma; fertilisation is fusion of gamete nuclei in the ovule.

Where does fertilisation occur in a flower? In the ovule, inside the ovary — not on the stigma.

How are wind-pollinated flowers adapted? Small dull petals, anthers exposed to wind, feathery stigma, and large amounts of light pollen.

How do I revise plant sexual reproduction effectively? Learn flower structure, the pollination–fertilisation sequence, insect vs wind adaptations, then take the quiz.

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Start with the Sexual Reproduction in Plants subtopic page, then book a free trial with a Cambridge IGCSE Coordinated Science specialist.

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