Plant reproduction
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Plant Reproduction. Unit 6 – Lecture 6. Alternation of Generations. type of reproduction utilizing asexual & sexual means. Alternation of Generations. offspring generations alternate between being haploid [1n] in one generation to being diploid [2n] the next. Alternation of Generations.

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Plant Reproduction

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Plant reproduction

Plant Reproduction

Unit 6 – Lecture 6


Alternation of generations

Alternation of Generations

  • type of reproduction utilizing asexual & sexual means


Alternation of generations1

Alternation of Generations

  • offspring generations alternate between being haploid [1n] in one generation to being diploid [2n] the next.


Alternation of generations2

Alternation of Generations

  • in some plants, the sporophyte is a completely different plant than the gametophyte.

  • in others, the gametophyteis something we really don’t see.


Alternation of generations3

Alternation of Generations

  • Sporophyte [2n] produces spores [1n]through meiosis

    • sporophyte is the typical “adult plant” that we see


Alternation of generations4

Alternation of Generations

  • Spores [1n] producegametophytes [1n] throughmitosis


Alternation of generations5

Alternation of Generations

  • Gametophyte [1n]produces gametes [1n]through mitosis


Alternation of generations6

Alternation of Generations

  • Gametes [1n] fuse in fertilization to produce zygote [2n]


Alternation of generations7

Alternation of Generations

  • Zygote [2n] grows to become embryo [2n]


Alternation of generations8

Alternation of Generations

  • Embryo [2n] grows to become sporophyte [2n]…

  • etc.


Alternation of generations9

Alternation of Generations

  • non-vascular and non-seed plants MUST have water to reproduce.

    • flagellated sperm must swim to egg

    • gametophyte can be very small, but visible – 1cm or less.


Other asexual reprod methods

Other Asexual Reprod Methods

  • vegetative reproduction – new plant forms from existing plant part (roots)

  • fragmentation – new plant forms from a cutting of the original plant.


Seed plants

Seed Plants

  • are vascular…

  • two varieties:

    • gymnosperm – produce cones

    • angiosperm – produce flowers


Angiosperms

Angiosperms

  • produce flowers and seeds inside of a fruit

    • petals, pistil, stamen, etc.

      • petals attract pollinators

      • fruit attracts organisms which can spread seeds


Angiosperms1

Angiosperms


Angiosperms2

Angiosperms


Angiosperms3

Angiosperms

  • are either monocot or dicot

    • cotyledon – the seed “leaves” or sides / food supplies

    • don’t need to know these directly:

      • have different types of xylem & phloem

      • have different types of veination

      • have differences in petal arrangement


Seed production

Seed Production


Germination

Germination

  • germination – zygote growing into new plant

    • requirements:

      • water

      • suitable temperature

      • oxygen

      • time


Germination1

Germination

  • germination – zygote growing into new plant

    • requirements:

      • light

      • other:

        • freezing – apples

        • soaking in salt water – coconuts

        • fire – many conifers

    • cannot be halted


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