Botany_Seed+Development

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Author:
Anonymous
ID:
111188
Filename:
Botany_Seed+Development
Updated:
2011-10-22 20:22:35
Tags:
seeds development
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Description:
Botany, seeds and development
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  1. Flow chart of megagametophyte development.
    • 1. Begin with a microsporocyte
    • -meiosis
    • 2. Now have 1 megaspore and 3 small, dead cells
    • -mitosis (3x)
    • 3. Now have 8 nuclei in one cell
    • -wall formation
    • 4. Now have the following:
    • 3 antipodal cells (haploid)
    • 2 polar nuclei in central cell (each is haploid)
    • The egg apparatus
    • -2 synergid cells (haploid)
    • -1 egg cell (haploid)
  2. Flow chart of microgametophyte formation:
    • 1. Megasporocyte
    • -meiosis
    • 2. Now have 4 microspores
    • -mitosis
    • 3. Two things developed
    • -vegetative cell (growth) pollen tube
    • -generative cell (mitosis) 2 sperm cells
  3. What ploidy is the endosperm nucleus?
    triploid
  4. As the ovule develops into a seed, the ovary matures into a ___
    fruit
  5. What are the 3 layers of a fruit?
    • 1. Exocarp: outer most layer
    • 2. Mesocarp: flesh, innermost layer
    • 3. Endocarp: may be tough like a stone or pit
  6. What is the pericarp?
    The entire fruit wall, no matter how many layers it has.

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