Can you work out what these are trying to say?. Plant Reproduction.

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    16-Dec-2015

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  • Slide 1
  • Can you work out what these are trying to say?
  • Slide 2
  • Plant Reproduction
  • Slide 3
  • Slide 4
  • Sexual Reproduction in Plants Link to the Edexcel Syllabus 3.3 Describe the structures of an insect pollinated and a wind pollinated flower and explain how each is adapted for pollination. Learning Objectives Be able to identify and label the reproductive structures of a flower, both wind and insect pollinated Appreciate the structural adaptations that both wind and insect pollinated flowers exhibit Distinguish between the terms cross and self-pollination and understand why and how flowers try to prevent self-pollination Enhancement of learning Show an appreciation of the potential impact that the depletion in honey bee numbers may have on human populations
  • Slide 5
  • Flowers are the reproductive organs of plants
  • Slide 6
  • Structure and function of the flower stigma style ovary ovule carpel filament stamen petal sepal receptacle peduncle anther
  • Slide 7
  • Slide 8
  • Flower Structure Quiz What is the name of the structure labelled X in the diagram? B.sepal C.stamen D.peduncle A.carpel X
  • Slide 9
  • Flower Structure Quiz Where is pollen made? A.stigma B.sepal C.anther D.ovary
  • Slide 10
  • Flower Structure Quiz Where is the ovule found in a flower? A.petals B.style C.nectary D.ovary Flower Structure Pollination Fertilisation Seed Dispersal Germination Test
  • Slide 11
  • Flower Structure Quiz Which parts of the flower are labelled below: B. X = filament, Y = anther X Y C. X = stigma, Y = style D. X = anther, Y = filament A. X = style, Y = stigma
  • Slide 12
  • Pollination The pollen grain contains the male sex cell (gamete)
  • Slide 13
  • Pollination is the transfer of pollen from the anther to the stigma
  • Slide 14
  • Slide 15
  • Pollen can be carried between flowers by insects or by wind
  • Slide 16
  • Slide 17
  • Wind-pollinated flowers are different in structure to insect pollinated flowers as they do not have to attract insects to them but do need to be exposed to the wind. Petals are small and green as there is no need to attract insects Stigmas are feathery to catch pollen carried in wind Anthers are exposed to the wind so that pollen can easily be blown away Pollen grains are very small and light. They occur in very large numbers No scent or nectary Flower Structure Pollination Fertilisation Seed Dispersal Germination Test
  • Slide 18
  • Insect-pollinated flowers are adapted to attract insects to enable the transfer of pollen Sticky stigma to collect pollen Brightly coloured petals nectar and a scent present Pollen has barbs for hooking onto insect fur Anthers positioned to rub pollen onto insects Flower Structure Pollination Fertilisation Seed Dispersal Germination Test
  • Slide 19
  • Slide 20
  • Pollination can be self pollination or cross-pollination This is an example of cross-pollination as the pollen travels from one flower to a different flower.
  • Slide 21
  • Self-pollination occurs when pollen falls from the anther onto the stigma of the same flower Self- pollination is not desirable as it reduces genetic variation
  • Slide 22
  • Flowers will prevent self-pollination by either having stigma above stamen or
  • Slide 23
  • by having stamen and stigma mature at different times.
  • Slide 24
  • Pollination Quiz Pollination is the transfer from.? A. stigma to anther B.style to stamen D.anther to stigma C.ovule to filament
  • Slide 25
  • Pollination Quiz The two mechanisms for pollination are? A.Wind and water C.Insect and water B.Insect and wind D.Wind and birds
  • Slide 26
  • Pollination Quiz Cross-pollination A.Increases genetic variation B.Decreases genetic variation D.Is only performed by wind C.Is only performed by insects
  • Slide 27
  • Pollination Quiz Flowers are adapted for wind-pollination by C.Having feathery stigmas B.Having a nectary A.Having bright petals and a scent D.Having sticky stigmas

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