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D3.1.9—Insect-pollinated flower features

Insect-pollinated flowers use traits such as odour, nectar, colour and suitable flower structure to attract animals that transfer pollen effectively.

Syllabus
First assessment 2025
Objective
D3.1.9
Level
HL

Exam analysis

Chance of appearing3%of analysed past papers
Latest appearanceMay 2023
Most common paperPaper2
Typical marks1–4

Common command terms

  • Identify
  • Draw

Recent exam appearances

May 2023Paper2 ["HL"] · TZ23(c)[ 1 ]D3.1.9—Insect-pollinated flower features
November 2019Paper2 ["HL"] · TZ08(a)[ 4 ]D3.1.9—Insect-pollinated flower features
May 2018Paper1 ["HL"] · TZ226[ 1 ]D3.1.9—Insect-pollinated flower features
Practice this objective

Coverage 2018–2023 · Updated 16 Jul 2026

Insect-Pollinated Flowers Advertise and Deliver Pollen

An insect-pollinated flower attracts a pollinator and positions its reproductive structures so pollen is picked up and later deposited on a stigma.

Structure/feature Function in insect pollination
Coloured or scented petals Attract and guide insects
Nectary Rewards feeding visits
Anthers held inside flower Brush sticky/rough pollen onto the insect
Sticky stigma inside flower Receives pollen carried on the insect
Ovary with ovules Contains female gametes that may be fertilized after pollen-tube growth

As a bee reaches nectar, the flower's anthers brush pollen onto its body; a later visit places some pollen on another flower's stigma.

For a diagram, annotate each named structure with its function; colour alone does not establish insect pollination.

Insect-pollinated flower features

Assessment in practice

1–4 marks
How it is assessed

This objective is assessed through structured response, commonly using Identify / Draw.

Command terms

Identify / Draw

What earns marks

Build the answer around this relationship: Nectar attracts animals that can transfer pollen between flowers.

Representative question

Question 1

[Maximum number: 4]

Draw a half-view of an animal-pollinated flower.

Retrieve the Core Reproduction Route

Core D3.1 route: reproduction creates offspring, gametes or pollen move, fertilization or germination follows, and the consequence is variation, embryo formation, seed production, or successful early growth.

  • mitosis makes clones; meiosis and fertilization create variation
  • hormones, anatomy, fertilization, and IVF support gamete fusion and embryo development
  • pollination and pollen-tube growth bring gametes together inside ovules
  • dispersal reduces competition and germination starts with water, enzymes, and reserves

Core Reproduction

Core D3.1 exam questions usually combine reproduction strategy with gamete formation, fertilization, human cycles, IVF, plant pollination, or seed germination. Treat each answer as a route: name the process, say what moves or changes, then give the biological consequence.

  • Compare asexual and sexual reproduction by mechanism and genetic outcome.
  • Link meiosis, fertilization, reproductive anatomy, and hormonal cycles to successful reproduction.
  • Explain plant pollination and seed stages by connecting structures to transfer, fertilization, dispersal, and germination.

Concept essentials

  • Nectar attracts animals that can transfer pollen between flowers.
  • Specific odours or other signals can improve animal pollination.
  • Flower structure matters because pollinators must contact anthers and stigmas.