Transcript Colorado AgriScience Plant Science

Colorado AgriScience
Plant Science
Unit 4: Plant Reproduction & Genetics
Lesson 1: Introduction to Plant
Reproduction
Plant Propagation
• Both are increasing the number of a
species
• Two types of Plant Propagation
– 1) Sexual Reproduction
– 2) Asexual Propagation
Sexual Reproduction
• The union of the female and male sex
cells to produce a seed or embryo
– Ovum: Female sex cell
– Pollen: Male sex cell
– Embryo (seed germ): immature plantlet
• Sexual Reproduction results in the
creation of a genetically new
individual!!
Asexual (Vegetative) Reproduction
• Production of a plant w/o uniting pollen &
ovum
• Known as plant cloning
• Leaves, stem, or roots may be used to
grow a new plant
• Occurs naturally and artificially
• Produces a genetically identical plant
Two Different Types of Seeds
• 1) Monocot
– Generally from the grass family
• 2) Dicot
– Generally broad leaf plants
Monocots
• Seeds w/ 1 seed leaf
• 1 solid seed
• Leaves have parallel
•
•
veins
Roots are
advantageous
Examples
– Corn, wheat, barley,
oats
Dicots
• Seeds w/ 2 seed
•
•
leaves or cotyledons
Veins are webbed
Examples
– Beans, potatoes, sugar
beats, sunflowers
Types of Flowers
• 2 Types
– 1) Perfect Flower
– 2) Imperfect Flower
Types of Flowers Cont.
• To the Left is a
•
complete or perfect
flower
An incomplete or
imperfect flower is
missing one or more
of the labeled parts
Pollination
• Transfer of pollen
•
from the anther to
the stigma of a flower
of the same species
May be accomplished
by wind, gravity,
bees, or manually
Fertilization & Germination
• Fertilization
– The union of pollen & ovum
• Germination
– The sprouting of a seed