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CAIE IGCSE Biology 16.3 Sexual Reproduction in Plants Questions

Practise plant reproduction questions by labelling flower parts, comparing pollination adaptations and sequencing pollen-tube fertilisation.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • label flower structures and compare insect- and wind-pollinated adaptations using petals, nectar, anther/stigma position and pollen features
  • define pollination as anther-to-stigma transfer, distinguish it from fertilisation, and trace pollen-tube growth and nuclear fusion in the ovule
  • distinguish self- from cross-pollination and compare their effects on variation, adaptation and reliance on pollinators
  • interpret seed-germination investigations using water, oxygen and suitable temperature requirements

Covered syllabus points

16.3.1—Draw the following parts16.3.2—Functions of the structures listed16.3.3—Describe the anthers and stigmas16.3.4—Pollen grains of insect-pollinated16.3.5—Pollination as the transfer of pollen16.3.9—Self-pollination as the transfer16.3.10—Cross-pollination as the transfer16.3.11—Potential effects of self-pollination16.3.6—Fertilisation occurs when a pollen16.3.7—Structural adaptations16.3.8—Environmental conditions that affect16.3.12—Growth of the pollen tube and its

Question 1

[Maximum number: 7]

Question (a)

(a)

Fig. 6.1 is a half-flower drawing of pride of Barbados, Caesalpinia pulcherrima.

Fig. 6.1

Fig. 6.1

Complete Table 6.1 by stating the letter from Fig. 6.1 that indicates the organ where each function occurs and the name of the organ.

Table 6.1

Table 6.1

[ 4 ]

Question (b)

(b)

Fig. 6.2 is a scanning electron micrograph of some pollen grains from wind-pollinated flowers and insect-pollinated flowers.

Fig. 6.2

Fig. 6.2

[ 2 ]

Question (i)

(i)

Explain how the pollen grain labelled J is adapted for insect pollination.

[ 2 ]

Question (c)

(c)

Pollen grains grow tubes, which contain haploid male gamete nuclei.

[ 1 ]

Question (i)

(i)

One of these male gamete nuclei fuses with the female gamete.

State the part of the flower that contains the female gamete.

[ 1 ]

Question 2

[Maximum number: 1]

The diagram shows a flower.
In which structure do seeds develop?

Figure for Question 2 — CAIE IGCSE Biology
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