How does fertilisation happen in plants?
Reveal answer
Pollen tube grows down style → enters ovule (micropyle) → male nucleus fuses with female nucleus.
Key words: pollen tube
4(a) REPRODUCTION · RECALL
4.4 Pollen tube, seed and fruit
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What does the ovule become?
Reveal answer
The seed.
Key words: seed
What does the ovary become?
Reveal answer
The fruit.
Key words: fruit
Why disperse seeds?
Reveal answer
Less competition with parent for light, water, minerals.
Key words: competition
Through what does the pollen tube enter the ovule?
Reveal answer
The micropyle.
Key words: micropyle
What is meant by the term pollen tube?
Reveal answer
Tube growing from a pollen grain to deliver a male nucleus to an ovule.
Key words: pollen tube
What is meant by the term seed?
Reveal answer
Mature ovule containing an embryo, food reserve and protective coat.
Key words: seed
What is meant by the term fruit?
Reveal answer
Mature ovary structure containing seeds.
Key words: fruit
What is meant by the term compatible?
Reveal answer
Able to complete recognition and fertilisation within the species.
Key words: compatible
From flower to fruit: for Pollen on stigma, give the change and the outcome.
Reveal answer
Change: Germinates. Outcome: Pollen tube begins.
Key words: Pollen on stigma
From flower to fruit: for Style, give the change and the outcome.
Reveal answer
Change: Pollen tube grows through tissue. Outcome: Male nucleus is delivered.
Key words: Style
From flower to fruit, Ovule (Gamete nuclei fuse). Outcome?
Reveal answer
Diploid zygote forms.
Key words: Ovule
From flower to fruit: for Zygote, give the change and the outcome.
Reveal answer
Change: Divides by mitosis. Outcome: Embryo develops.
Key words: Zygote
From flower to fruit, Ovule (Matures after fertilisation). Outcome?
Reveal answer
Seed forms.
Key words: Ovule
From flower to fruit: for Ovary, give the change and the outcome.
Reveal answer
Change: Wall and tissues develop. Outcome: Fruit forms.
Key words: Ovary
True or false, and why? “Pollen travels down the style as a whole grain.”
Reveal answer
False. A tube grows from it and carries male nuclei.
True or false, and why? “The pollen tube is a root.”
Reveal answer
False. It is a specialised outgrowth of a pollen grain.
True or false, and why? “The seed develops from the ovary.”
Reveal answer
False. An ovule becomes a seed; the ovary becomes a fruit.