Grade 7 Unit 1 - Weebly

Grade 7 Unit 1 - Weebly

Grade 7 Unit 1 Topic 1: Interactions Within an Ecosystem In this module we will explore: The interactions between living things and their environment; The circulation of nutrients and energy in the environment; The role of organisms in their environment; How species in an environment can change over

times; The causes of the extinction of species and methods used to help endangered species; Before we start: The white crane Read the introduction on page 2. Try to answer the following questions: Information from the introduction: In the forties, there were only 22 white cranes left in the world. Today, the number is growing slowly, but this species is

still in danger of disappearing. (1) Why are they still considered an endangered species? - Because they are at risk of disappearing. (2) Where can we find this majestic bird? - They spend the summer in the north of Alberta and in the North West Territories. (3) Name three things that the white crane needs to survive in its environment: -Food -water

- a healthy environment Topic 1 pg 6-17 Interactions Within Ecosystems ? Did you know that there is greenery on all continents except Antarctica ?

Staging Put yourself in the place of a fox that lives in Alberta. (a) Name 5 sources of food you could find. (b) What animal would you be afraid of because they might kill you for their supper? (3) (c) Describe the grassland ecosystem in which you live :

What is an ecosystem? All the interactions parts of a biological community and its environment. What is the study of ecology? The study of how organisms interact with each other and their environment If you were an ecologist, what are three topics you could study about foxes? In other words, what are the relationships / interactions you could study? The type of food they would eat.

Places where it digs its burrows. Where it raises its young. In the case study of the Alberta Swift Fox: The swift fox has been

reintroduced back into Alberta after being almost completely wiped out in the early 1900s. Accidental poisoning, intended for the wolves and coyotes, and loss of natural habitat caused their near extinction in Alberta. Ecologists, with the help of others, have created new programs and suitable habitats for the swift fox to once again be in Alberta.

Biotic Something thats living Abiotic Something thats not living Activity Let us look at living things and non-living objects that make up our schoolyard. Identify six biotic factors in the environment of the schoolyard and then make a list of six abiotic factors affecting each

biotic factor. Biotic Abiotic The Needs of Living Things There are 4 vital needs that are common for all living things. They are food, water, habitat and the ability to exchange gases.

It is the search for these things that cause organisms to always interact with each other and with non-living things in their environment. The Needs of Living Things cont. 1. Food provides energy through various nutrients

(fats, protein and carbohydrates) so that living things so that they can grow, regenerate and reproduce Food The Needs of Living Things cont. 2. Water:

constitutes a large proportion of living beings (humans are approximately 2/3 water). You will die quicker from a lack of water than you would from a lack of food Water

The Needs of Living Things cont. 3. Suitable Habitat: a habitat is the location where an organism lives. Many creatures live in a very particular environment and cannot survive elsewhere. A Suitable Habitat

A Suitable Habitat The Needs of Living Things cont. 4. Exchange of gases: living things exchange gases in order to stay

alive. Methods of gas exchange may vary widely. Exchange Gases (Breathe) Interesting facts: Several organizations have lungs and breathe oxygen, but the lungs are not the only way to living beings to inhale and exhale. Grasshoppers have a tracheal tube and stigma (tiny pores)

The earthworm has a wet skin surface which serves as a respiratory organ Fish have gills Leaves have stomata (little holes in the leaf) Adaptations Name 3 adaptations of a bird: Beak, legs, hollow bones etc. ... Why have birds developed these various adaptations? To survive their environment Adaptation is an inherited trait that helps an organism survive and

reproduce in its environment. Thus, it makes the individual more suited to its role in the environment. Some organisms may be forced to adjust to their environment to survive Adaptations Adaptations Video Adaptations cont.

Learned characteristics, that help an organism survive in its environment, are not adaptations because they are not inherited. Ex: Humans are able to survive in a wide variety of habitats, from underwater to space, though these are not adaptations. They are merely advances in science learned throughout our history.

Name some factors that can influence an organism to adapt to its environment: Humans, loss of habitat, change in food, etc. ? Read Did You Know on page 11 and note 1 adaptation: ? Activity: think of two other animals and their adaptations

and how it helps them Beak Shape is an Adaptation Adaptations cont. The example of the Earthworm: Earthworms have developed many

adaptations to survive in its environment. 1. 2. 3. They breathe directly through their skin. They are able to eat soil. They rely on the moisture in the soil to survive and breathe properly, but too much moisture (like when it rains) forces the earthworm to come to the surface to breathe.

Adaptations cont. Animal Adaptations Video Clip: Adaptations Web link: Lab Activity: Tools for the Task P.12 Cheerios

1. kitchen tongs 2. toothpicks 3. spoons 4. skewers 5. clothespins 6. beaker tongs 7. straws 8. forceps 9. stirring rods Five 30s rounds per tool.

Elastics Raisins Rice Ecosystems An ecosystem is the interaction between

living and non-living components in a particular environment. Ecosystems can be as large as a forest or as small as a rotting log. Activity- Using the photo on the side and describe at least 5 different interactions that could happen. 1) 2) 3)

4) 5) What do you think will happen if you removed an item, such as water? Beaver? Describe the possible effects. What other elements will have to change? If so, how? What happens if they cannot change? Ecosystems cont.

All components of an ecosystem are connected together. If one of them is affected others will have to adjust! Some organisms adjust to change better than others

Ecosystems cont. If we can understand how an ecosystem functions and the connections between different parts, we can predict and / or understand the effects of changes. Because of the complexity of ecosystems,

scientists will often study one aspect of an ecosystem, they then put their work together with other scientists who are studying other aspects of the ecosystem, to get an overall picture of how it functions. Ecosystems cont. What could cause change in an ecosystem?

Interactions in Ecosystems Symbiosis an interaction between organisms of different species living in close proximity to each other in a relationship that lasts over time. Interactions in Ecosystems cont.

There are three main types of symbiotic relationships: Symbiotic Relationships (Ecology) - YouTube Mutualism: is a relationship where both species benefit. Thus, a + +

1. Ex : When insects are pollinating. The insect gets food from the flower and the plant is now capable of reproducing. Crazy Ant Farmers - Weird Nature - BBC animals Interactions in Ecosystems cont. b) Parasitism - is a relationship where one species takes

advantage of another for which the other suffers adverse consequences, sometimes it can even kill. Thus a + - (see figure 1.8) Parasite - is the species receiving the benefits of its host Host is the species that suffers the consequences so that parasite can benefit Ex : a leech receives blood from another animal which is now devoid of blood. Interactions in Ecosystems cont. Commensalism is a relationship where one species takes

advantage but this does not bother the other. Thus, a + 0. (see figure 1.9) Ex : pilot fish lives near sharks. There is protection and a food source: debris left by the shark. The shark does not benefit and is not injured in this association. Symbiosis: Mutualism, Commensalism, and Parasitism YouTube

FYI: Cool Tools The Crittercam, designed by Scientist-filmmaker Greg Marshall, was inspired by the way the remora fish hung on to a shark.

This small cylinder can be attached to the side of a shark with a small metal dart. The battery-powered video camera inside records the movements and activities of the shark, and when the power is low it automatically detaches from the shark and floats to the surface. A satellite beacon directs the crew to it location for retrieval.

Remember Ecosystems consist of organisms interacting with all the biotic and abiotic parts of an environment. Symbiotic relationships are just some of the interactions between organisms of ecosystems. All organisms in an ecosystem exert some impact when interacting . Video

Clip: HowStuffWorks Videos "Fooled by Nature: Beaver Dams" Activity - Read the paragraph at the bottom of page 16 and describe how beavers have an impact on its ecosystem. Other impacts on the ecosystem: England, cars traveling on highways have killed more than 100,000 toads every year. Special tunnels were built under the road for more

than 200 toads so that they can cross the highway. What impact could this have if we did not create tunnels? What impact do the tunnels possibly create? Review of topic 1 pg.17 # 1, 2,3, 4, 5

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