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Transcript of The Plants
The Introduction to Plants
Four Major Plant Groups
Why Plants Are Important?
The Evolution of Plants
Plants were thought to have come from green algae because they share several characteristics. One of the characteristics is, they both contain chlorophyll a and b which are two forms of the green pigment used in photosynthesis.
There are currently more than 270,000 living species of plants on Earth. All of these plant species are organized into 4 four major groups. These four group are:
Non-vascular plants- plants that do not possess particular tissues that transports water and nutrients.
Seedless vascular plants- plants that reproduce and spread through spores, but does not flower on seed.
Gymnosperms- plants that have seeds unprotected by an ovary or fruit.
Angiosperms- plants that has flowers and produces seeds enclosed within a carpel.
Characteristics of a Plant
All plants perform photosynthesis.
To perform photosynthesis plants have to be in an environment that has sunlight, carbon dioxide and water.
With photosynthesis plants can maintain good growth and a healthy development.
Plants need specific nutrients, such as potassium, phosphorus, and nitrogen in order to make proteins, lipids, and other compounds needed in their cell.
Even though plants need those other nutrients, the main substance they need is water.
If plants were to lose a lot of water they can shrivel up and die but if they get too much water they can also die.
Bryophytes are the simplest land plants.
Bryophytes have a protective cuticle (film covering the leaves) and stomata (slit of variable width that allows movement of gas in and out of the intercellular space) for gas exchange.
Mosses do not have specialized vascular tissue or true leaves, roots or seeds.
The gametophyte generations of bryophytes produce swimming sperm in structures called
(an organ that produces and stores male gametes.)
Bryophytes can only reproduce in places with little to no wet conditions, such as rains or heavy dew.
Lycophytes and Pterophytes:
Vascular tissue consist of xylem (vascular tissue that conducts water and dissolves nutrients) and phloem (vascular tissue that conducts sugar and other metabloic products).
is a key chemical component of vascular tissue. It is responsible for the great strength of woody tissue.
Some grow 2M on diameter and more than 40m in height.
Lycophytes and pterophytes plants, which reproduce by spreading through spores.
Gymnosperms: The Conifers
Angiosperms: The Flowering Plants
Angiosperms produce flowers, which forms the largest group of living plants.
Coniferous trees, mosses and ferns are an example of angiosperms
The eggs are protected in an enclosed ovary, for a female, the seeds from the ovary and the outer tissues of the ovary develop into a FRUIT!
An angiosperms has two different seeds. (either 1 mono or 2 di cotyledons)
Monocots is one of the largest groups of flowering plants, along with Eudictos.
Monocots includes 10 000 species of grasses and 20 000 species of orchids. While, Eudictos has more than 200 000 species (mostly flowering trees).
Characteristics of Plants
Plant Reproduction: The Pine Tree
This is a vascular plant, that produces seeds in special structures, that are named cones.
Cone is a very important factor for gymnosperms, they are the reproductive structures of conifers
Females produce eggs, while male cones produce and release pollen.
Gymnosperms include the coniferous tress; such as pines, spruce, cedars, and ginkgoes. It is well adapted to resist hot dry summers and cold winters.
85% of all wood is used in construction and furniture from gymnosperms. They are also the source of some pulp and paper.
In many climates like hot and humid or cold and icy, plants can live pretty much anywhere.
Plants are producers of mostly food but also clothing such as cotton shirts, medicine from aloe plants, smoking tobacco or marijuana, wood and paper products for construction and any type of paper including toilet paper.
Plants can also establish a home for organisms and keep Earth's atmosphere, water, and land healthy.
The Group of Plants
By: Briana D, Vanessa F, and Emilia P