Compare the features of pollen grains from wind-pollinated flowers with pollen grains from insect-pollinated flowers.

Cambridge International IGCSE Biology (0610) — 16.2 Sexual reproduction · Compare · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

Wind‑pollinated pollen grains are
1. smaller and lighter than insect‑pollinated grains.
2. produced in far greater numbers.
3. have smooth surfaces with no spikes or hooks.
4. are not sticky.

Insect‑pollinated pollen grains are
1. larger and heavier.
2. produced in smaller quantities.
3. have spikes or hooks on the surface.
4. are sticky, allowing attachment to insects or the stigma.

Examiner tips

Use the word ‘compare’ to list contrasting features in bullet form.
Mention size, quantity, surface texture and stickiness – the four key points.
Keep each point short and use exam‑specific terminology (e.g. ‘sticky’).

Common mistakes

Confusing the direction of comparison (e.g. saying wind pollen is sticky).
Omitting one of the four key contrasting features.

Mark scheme (4 marks)

Wind-pollinated pollen grains are smaller / lighter than insect-pollinated pollen grains (which are larger / heavier)
Wind-pollinated flowers produce greater numbers of pollen grains, whereas insect-pollinated flowers produce fewer
Wind-pollinated pollen grains have smooth surfaces (no spikes or hooks), whereas insect-pollinated pollen grains have spikes or hooks on the outside
Insect-pollinated pollen grains are sticky (to attach to insects / stigma), whereas wind-pollinated grains are not sticky

Key terms in this question

pollen grain · wind-pollinated · insect-pollinated