Flower structure and reproduction
Flower parts, male and female gamete production (mimicking shape of flower!!)
- Created by: ava.scott
- Created on: 28-01-15 11:24
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- Ovary
- S T Y L E
- stigma
- FERTILISATION
- The process where the male gamete fuses with the female gamete to produce a zygote/
- compatible pollen grain lands on stigma, which produces a sugary solution for the grain to germinate, creating a pollen tube.
- pollen tube grows down the style, with the tube nucleus leading. It produces digestive enzymes to do this.
- the pollen tube lead, with two male nucleus behind, made by mitosis of the generative nucleus.
- pollen tube grows through micropyle between the integuments, and into the embryo sac.
- the tube nucelus disintegrates and the pollen tube bursts, releasing two male nuclei.
- 1 male nucleus fuses with female nucleus to make a zygote. the next fuses with polar nuclei to make triploid endosperm.
- SPECIAL FLOWER DOUBLE FERTILISATION.
- 1 male nucleus fuses with female nucleus to make a zygote. the next fuses with polar nuclei to make triploid endosperm.
- the tube nucelus disintegrates and the pollen tube bursts, releasing two male nuclei.
- pollen tube grows through micropyle between the integuments, and into the embryo sac.
- the pollen tube lead, with two male nucleus behind, made by mitosis of the generative nucleus.
- pollen tube grows down the style, with the tube nucleus leading. It produces digestive enzymes to do this.
- FERTILISATION
- stigma
- PETAL
- brightly coloured and scented to attract insects for pollination
- pollination- the transfer of pollen grains from the anther to the stigma of a plant of the same species.
- self
- pollen grains transferred from the anther to the stigma of the same flower/flower of the same plant,
- results in inbreeding and reduction in variation
- undesirable recessives come together
- depends on crossing over and random assortment for variation
- preserves good genomes
- cross
- the pollen is transferred to a stigma of a different flower on a different plant of the same species.
- insect
- depends on insects
- they feed on nectar at the nectary (base of flower)
- brush against anthers and pollen sticks
- pollen reaches stigma of the next plant the insect feeds from
- brush against anthers and pollen sticks
- they feed on nectar at the nectary (base of flower)
- brightly coloured and scented
- nectar
- anthers and stigma in flower
- small amounts of sticky pollen
- anthers and stigma in flower
- nectar
- depends on insects
- wind
- anthers hang outside the flower so wind can blow away small, light pollen
- feathery stigmas hang outside the flowers and provide large surface area.
- small green and inconspicous
- no petals
- no scent or nectar
- no petals
- anthers hang outside the flower so wind can blow away small, light pollen
- self
- pollination- the transfer of pollen grains from the anther to the stigma of a plant of the same species.
- brightly coloured and scented to attract insects for pollination
- PETAL
- anther
- produces haploid pollen grains
- pollen grains have a hard resistant coat to avoid dessication
- via meosis
- haploid nucleus undergoes mitosis
- to create a generative and tube nucleus
- made up of four pollen sacs which later dry out and split to release pollen
- this is called dehiscence
- produces haploid pollen grains
- anther
- sepal
- protects the flower when a bud
- sepal
- anther
- anther
- Ovules are made here
- the mother cell undergoes meiosis to make a haploid embryo sac with 8 nuclei formed later by mitosis
- DEVELOPMENT of FRUIT AND SEED
- Integuments become seed coat, or testa.
- ovary become fruit
- ovule becomes seed
- triploid endosperm becomes food source for germinating seed
- zygote divided by mitosis to become the embryo with a plumule(shoot) and radicle (root) and two seed leaves/cotyledons.
- S T Y L E
- S T Y L E
- stigma
- FERTILISATION
- The process where the male gamete fuses with the female gamete to produce a zygote/
- compatible pollen grain lands on stigma, which produces a sugary solution for the grain to germinate, creating a pollen tube.
- pollen tube grows down the style, with the tube nucleus leading. It produces digestive enzymes to do this.
- the pollen tube lead, with two male nucleus behind, made by mitosis of the generative nucleus.
- pollen tube grows through micropyle between the integuments, and into the embryo sac.
- the tube nucelus disintegrates and the pollen tube bursts, releasing two male nuclei.
- 1 male nucleus fuses with female nucleus to make a zygote. the next fuses with polar nuclei to make triploid endosperm.
- SPECIAL FLOWER DOUBLE FERTILISATION.
- 1 male nucleus fuses with female nucleus to make a zygote. the next fuses with polar nuclei to make triploid endosperm.
- the tube nucelus disintegrates and the pollen tube bursts, releasing two male nuclei.
- pollen tube grows through micropyle between the integuments, and into the embryo sac.
- the pollen tube lead, with two male nucleus behind, made by mitosis of the generative nucleus.
- pollen tube grows down the style, with the tube nucleus leading. It produces digestive enzymes to do this.
- FERTILISATION
- stigma
- filament
- has vascular tissues to transport nutrients, and also supports the anther
- female part= CARPEL
- male part = STAMEN
- anther
- produces haploid pollen grains
- pollen grains have a hard resistant coat to avoid dessication
- via meosis
- haploid nucleus undergoes mitosis
- to create a generative and tube nucleus
- made up of four pollen sacs which later dry out and split to release pollen
- this is called dehiscence
- produces haploid pollen grains
- filament
- has vascular tissues to transport nutrients, and also supports the anther
- anther
- anthers and stigma are outside and large and feathery
- large quantities of small, light smooth pollen
- no scent or nectar
- POLLINATION
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