Unit 3 nature

UNIT 3 NATURE

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ECOSYSTEMS An ecosystem is the community of biological organisms, where they interact with their physical environment.

TYPES OF ECOSYSTEMS Terrestrial ecosystem

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Aquatic ecosystem

Freshwater Ecosystems Freshwater ecosystems can be found in streams, rivers and lakes. Freshwater ecosystems are home to more than just fish: algae, plankton, insects, amphibians and underwater plants also inhabit them.

Marine Ecosystems Marine ecosystems contain saltwater.

Marine ecosystems are the most abundant types of ecosystems in the word. They encompass oceans, seas, beaches, estuaries, salt marshes, mangroves and coral reefs.

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ECOSYSTEMS ACTIVITIES 1. Match each characteristic to one of the five types of ecosystems.

1.

2.

3.

4.

5.

It can be found in streams, rivers and lakes. ____________________________ It has got arid soil and little water. ____________________________________ It has got high humidity and fertile soil. ________________________________ This ecosystem is the most abundant in the world. _______________________ Temperatures can be very high during the day and very low at night. _________________________ 6. Long periods of drought are found in these places._______________________ 7. There are many trees in this area. _________________________

2. Write what type of ecosystem you can see in each photo.

___________________________ ________________________ _____________________

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_____________________________

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NUTRITION IN THE ECOSYSTEMS Nutrition is when living things use food, water and oxigen to survive.

Plants make their own food.

According to the food they eat, animals can be classified as herbivores, carnivores and omnivores.  

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Herbivores are animals that only feed on plants.

Carnivores are animals that only feed on meat. Carnivores hunt other animals and eat them. Some carnivores scavenge, which means to find and eat bodies of dead animals.

Omnivores are animals that eat meat and plants.

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The Food Chain Every living thing needs energy in order to live. Everytime animals do something (run, jump) they use energy to do so.

Animals get energy from the food they eat, and all living things get energy from food.

Plants use sunlight, water and nutrients to get energy (in a process called photosynthesis). Energy is necessary for living beings to grow.

A food chain shows how each living thing gets food, and how nutrients and energy are passed from creature to creature. Food chains begin with plant-life, and end with animal-life. Some animals eat plants, some animals eat other animals.

Activity 1. Make a food chain with the nexts groups of living things. a) b) c) d)

Cow, grass, tiger. _____________________________________________ Beep, flower, snake, frog. ________________________________________ Eagle, mouse, snake, grass. ______________________________________ Human being, cereals, chicken. ___________________________________

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UNIT 3: NATURE An ecosystem is the comunity of...

PHYSICAL ENVIRONMENT

GROUP OF LIVING THINGS

ANIMAL

TERRESTRIAL ECOSYSTEM

PLANTS ALGAE

AQUATIC ECOSYSTEM

FOREST

FRESHWATER

FUNGI

MARINE

GRASSLAND BACTERIA DESERT

THE FOOD CHAIN

NUTRITION IN THE ECOSYSTEM Plants make their own food Animal Herbivore Carnivore Omnivore The food chain: nutrients and energy ara passed from creature to creature

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