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Edexcel IAL Biology 3.13 Fertilisation in flowering plants

Keep the nuclei distinct, state how the tube reaches the ovule and identify which male nucleus fuses with the egg or polar nuclei and what each fusion forms.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Explain how the pollen tube digests through the style and carries male nuclei.
  • Distinguish the tube nucleus from the dividing generative nucleus in diagrams.
  • Explain double fertilisation by linking nuclear fusions to embryo and endosperm.

3.13—Fertilisation in flowering plants question 1

[Maximum number: 3]

The photograph shows some pollen grains, as seen using an electron microscope.

Figure for Question 3.13—Fertilisation in flowering plants question 1 — Edexcel A-Level Biology AS
Figure for Question 3.13—Fertilisation in flowering plants question 1 — Edexcel A-Level Biology AS

A pollen grain can produce a pollen tube that contains a generative nucleus.

Plant fertilisation results in the production of an embryo and endosperm tissue. The diagram shows the location of an embryo and endosperm tissue in a seed.

Figure for Question 3.13—Fertilisation in flowering plants question 1 — Edexcel A-Level Biology AS

Describe how the generative nucleus results in the production of an embryo and endosperm tissue in a seed.

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