The Plant
By: Teddy Frisk
Origin of Plant
A
plant is a multicellular eukaryote.
Plants evolved from filamentous green
algae that lived in the ancient oceans.
Leafless plants later moved to land.
Adaptations in Plants
As plants moved from the oceans to land,
they had to adapt to survive.
The adaptations were:
Cuticle; the development of leaves, roots,
stems, & vascular tissues.
Alteration of generations; and the evolution
of the seed.
Cuticle
Waxy
waterproof coating of stems &
leaves of most plants.
Leaves/Roots/Stems
Leaves:
Plant organ that grows from a
stem, and usually where photosynthesis
occurs.
Roots: Plant organ that absorbs water &
minerals from soil.
Stems: Plant organ that provides support
for growth.
Vascular Tissues
Tube-like
cells where water, food, & other
materials are transported.
Alteration of Generations
2 stages; the gametophyte generation,
and the sporophyte generation (life cycle
of plant).
Gametophyte generation: All cells are
haploid.
Sporophyte generation: All cells are
diploid, & are produced by mitosis & cell
division.
Seed
Plant
organ that contains an embryo,
along with a food supply.
Plant Kingdom
Grouped into major categories called
divisions.
Nonvascular Plants
They
are in the divisions Anthocerophyta,
Hepaticophyta, & Bryphyta.
They produce mainly by using spores.
They don’t produce seeds.
Non-seed Vascular Plants
They
are in the divisions Psilophyta,
Lycophyta, Arthrophyta, & Pterophyta.
Their tissues conduct water & other
materials & reproduce mainly by spores.
Vascular Seed Plants
They
are in the divisions Cycadophyta,
Gnetophyta, Ginkgophyta, &
Coniferophyta produce seeds on cones.
Male cones & females cones can be on
separate plants or the same plant.
Anthophyta Division
It
includes vascular, seed-producing
plants that flower.
Fruits with seed develop from flowers.
Anthophytes are divided into two groups;
monocotyledons & dicotyledons.
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