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Plants Life Science Presentation

Basic overview of plant lesson for 7th grade life science
by

Amy Ramsdell

on 20 September 2010

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Transcript of Plants Life Science Presentation

What is a plant? Autotroph Producer Green? chlorophyll makes plants green chlorophyll lets the plants produce their own food 3,000,000,000 years oldest plant fossil animals didn't show up for about 2 1/5 billion years! plants use energy from the sun,
carbon dioxide, and water to make
their energy carbon dioxide water sunlight sugar (glucose) oxygen this is called PHOTOSYNTHESIS the waste product of photosyntheisis is OXYGEN The Plant Cell the plant cell has many features similar to animal cells it also has features that are different eukaryote a eukaryote is an organism that is made up of cells that have a true nucleus (remember 'eu' means true!) cell membrane nucleus
mitochondrion
Golgi apparatus
rough endoplasmic reticulum
smooth endoplasmic reticulim
ribosomes a large vacuole
chloroplasts with chlorophyll
cell wall Main groups of plants nonvascular plants vascular plants plants that lack specialized conducting
tissues and true roots, stems, and leaves
15,600 species plants that have specialized tissues that
conduct materials ffrom one part of the plant
to another. mosses liverworts hornworts
seedless plants seed plants ferns horsetails club moss gymnosperms angiosperms a woody, vascular seed plant whose
seeds are not enclosed in an ovary
or fruit
760 species a flowering plant that produces
seeds within a fruit or ovary nonvascular plants are SMALL
grow on soil, bark, and rocks
no specialized tissue to move water
ususally live in damp places
important roles in environment
usually the first plant to reclaim an area after fire
create new soil
reduce soil erosion
peat moss can be dried and used for fuel just like wood!
seedless vascular plants used to be very tall
club mosses could be 40 meters tall in ancient forests!
today, they are much smaller but still bigger that nonvascular
ferns up to 24 meters in tropical forests
horsetails up to 8 meters in wet, marshy areas
12,000 species svp's also help form soil
they slow soil erosion
popular houseplants
some are edible (fiddlehead and other fern fronds)
horsetails used as scouring rushes, dietary supplemets, shampoos, & skin care
svp's that died about 300 million years ago formed coal seed plants produce seeds
most common plants on earth
seeds form after fertilization of sperm and eggs
3 parts: seed coat, cotyledon (stored food), and sporophyte (young plant)
advantages: cotyledon feeds young plant, can be spread by animals gymnosperms make lumber and paper
pine resin used to make soap, turpentine, paint, and ink
the yew makes a cancer medicine
allergy medicine
4 groups: conifers, ginkoes, cycads, gnetophytes angiosperms are divided in 2 groups
monocots
dicots
angiosperms provide many animals with food they need to survive
major food crops
building materials
clothing and rope
medicines
rubber
oils
perfume
approximately 235,000 species
most abundant plant Cell Wall:
surrounds the cell membrane supporting
and protecting the cell
made of carbohydrates and protein Chloroplast:
organelle found in plant cells--not animal! Vacuole:
chamber that stores water and helps support the cell Cell membrane:
surrounds a plant cell and lies
beneath the cell wall Why does a plant need cell walls? 3 characteristics all plants share 1. make their own food
2. have a cuticle
3. have cell walls cuticle:
waxy layer that coats most of the surfaces
of a plant that are exposed to air--keeps
plants from drying out Structures of seed plants vascular tissue Xylem Phloem the type of tissus in vascular plants
that provides support and conducts
water and nutrients from the roots 'X' the tissue that conducts food in vascular
plants from the cholroplasts in the leaves
to the rest of the plant 'P' Roots supply plants with water and dissolved minerals
hold plants securely in the soil
store surplus food 'carrots' Stems support the plant body
transport materials
some store materials 'cactus'
woody stems are trunks Leaves main function is to make food for the plant
vary greatly in size and shape
Sepal in a flower, one of the outermost rings
of modified leaves that protect the flower bud Petal one of the ring of the usually brightly
colored, leaf-shaped parts of a flower Stamen the male reproductive structure of a flower
that produces pollen and consists of an
anther at the tip of a filament Pistil the female reproductive part of a flower that
produces seeds and consists of an ovary,
style, and stigma Ovary in flowering plants, the lower part of a pistil that produces eggs in ovules
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