Back to AI Flashcard MakerBiology /Biology IB HL - 9.4 Plant Reproduction Part 2
What are flowers?
Flowers are the reproductive organs of angiospermophytes (flowering plants) and develop from the shoot apex
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Key Terms
Term
Definition
What are flowers?
Flowers are the reproductive organs of angiospermophytes (flowering plants) and develop from the shoot apex
What causes the enlargement of shoot apical meristems?
Changes in gene expression trigger the enlargement of the shoot apical meristem
What does the tissue do in the shoot apical meristem?
This tissue then differentiates to form the different flower structures – sepals, petals, stamen and pistil
What is the activation of genes responsible for flowering influenced by? (basic)
abiotic factors - typically linked to seasons
When will flowering plants most likely bloom?
Flowering plants will typically come into bloom when a suitable pollinator is most abundant - this is dependent on seasons
What is the most common trigger for a change in gene expression?
The most common trigger for a change in gene expression is day/night length (photoperiodism)
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| Term | Definition |
|---|---|
What are flowers? | Flowers are the reproductive organs of angiospermophytes (flowering plants) and develop from the shoot apex |
What causes the enlargement of shoot apical meristems? | Changes in gene expression trigger the enlargement of the shoot apical meristem |
What does the tissue do in the shoot apical meristem? | This tissue then differentiates to form the different flower structures – sepals, petals, stamen and pistil |
What is the activation of genes responsible for flowering influenced by? (basic) | abiotic factors - typically linked to seasons |
When will flowering plants most likely bloom? | Flowering plants will typically come into bloom when a suitable pollinator is most abundant - this is dependent on seasons |
What is the most common trigger for a change in gene expression? | The most common trigger for a change in gene expression is day/night length (photoperiodism) |
Do flowers always contain both male and female structures? | NO; | Most flowers possess both male and female structures (monoecious), but some may only possess one structure (dioecious) |
What is the male part of the flower called? | stamen |
What is the stamen composed of? | anther | filament |
What is the anther? | pollen producing organ of the flower |
What is the male gamete of a flowering plant? | pollen is the male gamete of a flowering plant |
What is the filament? | slender stalk supporting the anther (makes the anther accessible to pollinators) |
What is the female part of the flower called? | pistil/carpel |
What is the carpel composed of? | stigma; style; ovule & ovary |
What is the stigma? | the sticky, receptive tip of the carpel that is responsible for catching the pollen |
What is the style? | the tube-shaped connection between the stigma and ovule (it elevates the stigma to help catch pollen) |
What is the ovule? | the structure that contains the female reproductive cells |
What happens to the ovule after fertilisation? | after fertilisation, it will develop into a seed |
What 3 support structures do flowers possess? | petals; sepal; peduncle |
What are the petals? | brightly coloured modified leaves, which function to attract pollinators |