People and Plants Topic 1. People and Plants  People use plants for things other than food.  Plants provide fibre  Fibre: tissue of plants from the.

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Presentation transcript:

People and Plants Topic 1

People and Plants  People use plants for things other than food.  Plants provide fibre  Fibre: tissue of plants from the stem, leaves, seeds or roots.

What do we use plants for? Environment Food Fibre Medicine Transportation & Construction Fuel Brainstorm how each of the above uses plants.

 As a critical part of the ecosystem, plants provide oxygen for organisms to survive. They are able to reduce the problem of pollution by using carbon dioxide. Carbon Dioxide Oxygen Plants in the Environment

 Plants are also the basis of most food webs as producers of food for herbivores and ultimately carnivores.

 Plants also provide shelter for animals, clean and filtered water and help prevent soil erosion.

Plants for FOOD  Nearly 75% of the world’s food supply is based on seven major crops:  Wheat  Rice  Maize (corn)  Potatoes  Barley  Cassava  Sorghum

From Plant to Final Product  Cocoa Chocolate is made from the fruit of the cocoa tree. Cocoa beans are roasted, shelled and then crushed. Cocoa butter and cocoa powder are separated. Cocoa powder is then mixed with milk to make chocolate. Brainpop Video: Chocolate (from tree to treat)

 Canola  78% of vegetable oil production is from canola  Canola is pressed from the canola seeds and used as salad oil and frying oil  It is used to make margarine, shortening, baked goods, potato chips and french fries.

Seaweed  Contains iodine and is used in soup broths and sushi  Other products from seaweed include:  Ice cream, chocolate milk, yogurt, whipped cream, pies, jellies, and candies.  Seaweed products are often used to thicken food (alginate, agar, carrageenan)

Sugar  Half of the world’s sugar comes from sugar beets, located in sugar beet roots  Roots re-shredded, heated in running water and the concentrated clear liquid crystalizes to produce sugar similar to sugar cane.

Plants for Fibre Plants provide fibres for clothing, paper and shelter. The aboriginal people from the west coast wove cloth from the bark of the western red cedar tree. Much of our clothing today comes from synthetic (manufactured) material such as polyester and nylon. Natural fibres also provide resources for cloth: Cotton, Hemp, Flax

 Cotton  Natural fibre that absorbs moisture and then allows it to evaporate easily  World’s most important NON-EDIBLE plant!

Hemp  Early makers of jeans used hemp  Oldest cultivated fibre plant in the world  Used to make the Bible, sails and ropes.  Good for the environment because:  Uses less land area than trees  Harvested in a year  Lasts longer than paper  Can be recycled several times  Chokes out weeds naturally  Not prone to insect pests.

Flax  Food and fibre crop  Used for making linen, paper, and drying oil in paints and varnish  Edible and put in food to add more fibre

Plants for Medicine  Many medicines (over 7000) contain ingredients made from plants.  Herbal remedies are a common example of how plants are used to prevent illness.  Plant medicines include:  Tea (made from ginger root – soothes upset stomach)  White willow bar (used to ease pain)  Opium Poppy seed pod (morphine & codeine)  Quinine (prevents malaria)

Plants for Transportation and Construction  Rubber is one of the most important plant products that people use.  Natural rubber comes from rubber trees.  Synthetic rubber is made from coal and oil by-products-but uses natural rubber.  Canoes were carved from trees by Aborginal people  Lubricants are provided from coconut and castor bean oils  The construction industry in North America uses wood as building material.  Brainpop Video : Rubber

Plants for Fuel  Wood or coal (which is a fossil fuel) are used to heat homes.  Sugar can be turned into ethanol and wood can provide methanol (wood alcohol).  Fuel from plants (biofuel) is economical, but not energy efficient because a large amount of energy is needed to grow the plants and a lot of energy is lost when it is converted to fuel.  Biofuel is also in production for car fuel  Brainpop Video : Biofuel (The power of plants)