Plants - Welcome to...After fertilization, each ovule develops into a seed and the ovary develops...
Transcript of Plants - Welcome to...After fertilization, each ovule develops into a seed and the ovary develops...
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Plants
By Gracie Lawrence, Kylie Carter, & Kaia Stefurak
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Learning Objectives:
28.1 - Understand plant structure & organization
28.2 - Understand primary & secondary growth
30.1 - Learn how flowers, double fertilization, and fruits are
unique features of the angiosperm lifestyle
30.2 - Learn how flowers reproduce sexually, asexually, or
both
31.1 - Understand how plant hormones help coordinate
growth, development, and responses to stimuli
31.2 - Learn how responses to light are critical for plant
success
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1.Angiosperm
Structure
( 28.1 )
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Root System:
Root - An organ that
anchors a vascular plant
in the soil, absorbs
minerals and water, and
stores carbohydrates.
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Shoot System:
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Stem - Orient shoot to
maximize
photosynthesis
Leaf - Main
photosynthesis organ.
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Tissue Systems:
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Dermal - Plant’s protective
outer covering.
Vascular - Facilitates
transport of materials
through the plant, and
provides mechanical
support.
Ground - Includes storage,
support, and transport
cells.
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2.
Angiosperm
Growth
( 28.2 )
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Indeterminate
Growth
throughout a
plants life,
continuously.
Determinate
Growth that
stops once the
plant reaches a
certain size.
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Primary Growth
Grows both above ground and below ground allowing
plant to get taller.
*SAM & RAM
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Secondary Growth
Increase of width in a plant by cell division in lateral
meristems
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Vascular Cambium
Adds secondary xylem and phloem
Cork Cambium
Replaces with a thicker periderm
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Reproduction cycles
and organs
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Pollination and fertilization
● Flowering plants are angiosperms● Seed bearing plants are gymnosperms
● Fertilization in angiosperms requires gametophytes
● Male gametophyte is the pollen grain● Female gametophyte is the embryo sac
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Pollen Formation
● Cells within a flower’s anther undergo meiosis to form four haploid cells
● Each cell divides by mitosis into a haploid male gametophyte consisting of two cells
● A thick wall forms around these cells
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PP
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Pollination Methods
Pollination is the transfer of pollen to a plant’s female reproductive organs to allow for fertilization.
● Pollen is usually spread with the assistance of wind or wildlife, such as birds, insects, and mammals.
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Embryo sac formation
1. One cell in a plant’s ovule, which consists of many undeveloped cells, enlarges
2. This cell undergoes mitosis to form 4 haploid megaspores
3. One megaspore survives per ovule, the rest degenerate
This process takes place in many ovules in the plant’s ovary and results in an embryo sac ready for fertilization 21
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Fertilization
● Fertilization in plants is the action or process of a pollen grain fertilizing an embryo sac to produce a zygote
● In flowering plants, two male calls are released and bind with two parts of the female organ in a process called double fertilization
Double fertilization occurs so the plant will not waste resources developing tissue for an ovule that has not been fertilized. 22
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Fertilization process
1. After pollination, the pollen shoot grows towards the plants ovary
2. It punctures the plants ovule and discharges two male cells into the fully-formed embryo sac
3. One male cell fertilizes the egg, while the other fuses with the polar nuclei located in the center of the ovule.
This process results in a fertilized egg as well as a triploid which will develop into endosperm, the food storing tissue of a seed. 23
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Fruit development
● After fertilization, each ovule develops into a seed and the ovary develops into a fruit
● For the most part, nutrients for the seed are stored in the endosperm
● Many different types of fruit develop bases on their developmental origins
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Asexual reproduction
Asexual reproduction is usually an extension of a plant’s capacity for indeterminate growth
● One type of asexual reproduction is fragmentation, or the separation of an individual plant into parts which develop into full plants.
● Another type is apomixis, or asexual reproduction of seeds.
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5. Plant
Hormones and
Tropisms
( 31.1)
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Auxin -
Stiumulates stem elongation and promotes
the growth of lateral roots.
Cytokinins -
Regulate cell division in shoots and roots and
stimulate growth of axillary buds.
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Gibberellins -
Produced in leaves and stems, and influence
fruit development and seed germination.
Abscisic Acid -
Slows plant growth and inhibits seed
germination (promotes dormancy).
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6. Responses to Light
(31.2)
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Tropisms
Plant’s directional movement due in response to
stimuli.
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Geotropism
Plant’s directional response to gravity
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Thigmotropism
Plant’s directional response to a solid object
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Phototropism
Plant’s directional response to light