ch. 24 – interactions of life sec. 3 – interactions within communities 7 th grade science saint
TRANSCRIPT
![Page 1: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/1.jpg)
Ch. 24 – Interactions of LifeCh. 24 – Interactions of LifeCh. 24 – Interactions of LifeCh. 24 – Interactions of Life
Sec. 3 – Interactions within CommunitiesSec. 3 – Interactions within Communities
77thth Grade Science Grade Science
SaintSaint
![Page 2: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/2.jpg)
Objectives
• Describe how organisms obtain energy for life.
• Explain how organisms interact.
• Recognize that every organism occupies a niche.
![Page 3: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/3.jpg)
Energy
Living organisms need a constant supply of energy.
![Page 4: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/4.jpg)
Energy
All of Earth’s energy comes from the Sun.
![Page 5: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/5.jpg)
Photosynthesis
Some organisms use the Sun’s energy to create energy rich molecules through a process called photosynthesis.
![Page 6: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/6.jpg)
Product of Photosynthesis
• Energy rich molecules, usually sugars, serve as food. They are made up of oxygen, hydrogen, and carbon atoms.
• Energy is stored in the chemical bonds of the atoms. When the bond is broken, energy is released to fuel life processes.
![Page 7: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/7.jpg)
Photosynthesis
![Page 8: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/8.jpg)
Producers
A producer is an organism that
uses an outside energy source like the Sun to make
energy-rich molecules.
![Page 9: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/9.jpg)
Producers contain chlorophyll
Most producers contain chlorophyll, a chemical that is required for photosynthesis.
![Page 10: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/10.jpg)
Green Plants
• Green plants are producers
![Page 11: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/11.jpg)
Chemosynthesis
• Some producers make energy-rich molecules through a process called chemosynthesis.– These organisms are found near
volcanic vents in the ocean floor. Inorganic molecules in the water provide the energy source for chemosynthesis.
![Page 12: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/12.jpg)
Hydrothermal Vents
![Page 13: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/13.jpg)
Tubeworms
![Page 14: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/14.jpg)
Consumer
• A consumer is an organism that cannot make their own energy-rich molecules. Consumers obtain energy by eating other organisms.
Wolves can’t make their own food. They are
consumers.
The Cape Buffalo can’t make its own food. It is
a consumer.
![Page 15: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/15.jpg)
Producer or Consumer?
• Tree• Dandelion• Weasel• Walrus• Diatom• Algae• Bacteria• Dog• You• Rhinoceros
![Page 16: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/16.jpg)
Consumers
There are 4 general types of consumers:
• Herbivores• Carnivores• Omnivores• Decomposers
![Page 17: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/17.jpg)
Herbivores
Herbivores – Plant eaters
• Deer
• Rabbits
• Grasshoppers
![Page 18: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/18.jpg)
Herbivores
Zebras eat grass. They are
herbivores.
Cows are herbivores.
![Page 19: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/19.jpg)
Herbivores
Hippos are herbivores.
Rhinos are herbivores.
![Page 20: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/20.jpg)
Carnivores
Carnivores – Meat Eaters – Eat other animals
• Frogs
• Spiders
• Cougars
![Page 21: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/21.jpg)
Carnivores
Lions definitely eat meat!
Not all carnivores have razor sharp
teeth.
![Page 22: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/22.jpg)
The Most Vicious Carnivore
The ShrewThe Shrew
![Page 23: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/23.jpg)
Omnivores
Omnivores – Eat both plants and animals
• Bears
• Pigs
• Humans
![Page 24: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/24.jpg)
Omnivores
While the panda’s digestive system is that of a carnivore,
their diet consists of 99% bamboo.
Raccoons are omnivores. They eat
both plants and animals.
![Page 25: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/25.jpg)
Decomposers
Decomposers – Consume waste and dead organisms. Decomposers help recycle once-living matter by breaking it down into simple, energy-rich substances. These substances might serve as food for decomposers , be absorbed by plant roots, or be consumed by other organisms.
• Fungi• Bacteria • Earthworms• Vultures
![Page 26: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/26.jpg)
Decomposers
Mushrooms and other fungi break-down
dead decaying matter.
![Page 27: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/27.jpg)
What type of consumer?
• Elk• Bobcat• Mushroom• Buzzard• Bear• Hippopotamus• Box Turtle• Snapping Turtle• Shark• Seal
![Page 28: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/28.jpg)
Food Chain
A food chain is a simple model of the feeding relationship in an ecosystem.
![Page 29: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/29.jpg)
Food Chain
For example, shrubs are food for deer, and deer are food for mountain lions.
Shrubs are the beginning of the food chain. They
receive their energy from
sunlight.
Because shrubs make their own food through
photosynthesis, they are called
producers.
The deer is the first organism of the food chain to
eat the shrub. It is the primary consumer.
The mountain lion is the second
organism of the food chain. It eats the deer. It is the
secondary consumer.
![Page 30: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/30.jpg)
Food Chain
Algae make their own food from
sunlight. They are the basis for the
food chain in this example.
![Page 31: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/31.jpg)
Food Chain
The first organism in a food chain is
always a producer. They make their
own food.
![Page 32: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/32.jpg)
Food Chain
![Page 33: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/33.jpg)
Food Chain
![Page 34: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/34.jpg)
Food Chain
![Page 35: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/35.jpg)
Food Chain
![Page 36: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/36.jpg)
Food Chain
![Page 37: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/37.jpg)
Food Chain
![Page 38: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/38.jpg)
Food Chain
![Page 39: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/39.jpg)
Food Chain
![Page 40: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/40.jpg)
Food Chain
![Page 41: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/41.jpg)
Food Chain
![Page 42: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/42.jpg)
Symbiosis
Not all relationships among organisms
involve food. Many organisms live
together and share resources in other ways. Any close
relationship between species is called symbiosis.
![Page 43: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/43.jpg)
3 Types of Symbiosis
• Mutualism
• Commensalism
• Parasitism
![Page 44: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/44.jpg)
Mutualism
Mutualism – A symbiotic relationship in which both species
benefit.
![Page 45: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/45.jpg)
Mutualism
Examples:
• Cowbirds and Large Animals
• Termites and Trichonympha
• Bees and Flowers
![Page 46: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/46.jpg)
Cowbirds and Large Animals
The cowbird benefits by eating the ticks and mites off the large animal. The large
animal benefits from have the parasites removed from them. The birds can also warn them
of danger.
![Page 47: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/47.jpg)
Termites and Trichonympha
You probably think termites eat wood; they do – in a way. Termites can’t digest cellulose, which is the
main component of wood. Therefore, they get help from a
protozoan called trichonympha. This protozoan lives in the gut of the
termite. It breaks down the cellulose for the termite. The trichonympha gets a free meal and shelter; the termite is able to eat and receive
nutrients from the wood.
![Page 48: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/48.jpg)
Termite and Trichonympha
![Page 49: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/49.jpg)
Termite and Trichonympha
![Page 50: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/50.jpg)
Termite and Trichonympha
![Page 51: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/51.jpg)
Termite and Trichonympha
![Page 52: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/52.jpg)
Trichonympha
![Page 53: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/53.jpg)
Trichonympha
![Page 54: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/54.jpg)
Bees and Pollen
Bees receive nectar from the flowers in
order to make honey. As the bees collect nectar, they
collect pollen on their body. As they fly to another flower, they pollinate it by dusting the pollen
on the flowers stamen.
![Page 55: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/55.jpg)
Commensalism
Commensalism – A symbiotic relationship in which one organism benefits and the other is not
affected.
![Page 56: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/56.jpg)
Commensalism
Examples:
• Clown fish and sea anemones
• Shark and remora
![Page 57: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/57.jpg)
Clown Fish and Sea Anemones
The clown fish is immune to the stings of the sea anemones
tentacles. The clown fish makes its home in the tentacles for protection. The clown fish gets shelter, but the
sea anemone gets nothing.
![Page 58: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/58.jpg)
Shark and Remora
The remora hangs around the shark picking up any scraps it may
leave. The remora gets food while the shark gets
nothing.
![Page 59: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/59.jpg)
Parasitism
Parasitism – A symbiotic relationship in which one organism benefits but
the other is harmed.
![Page 60: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/60.jpg)
Parasitism
Examples:
• Tapeworm and Humans
• Cuckoo bird and warbler
• Ticks
![Page 61: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/61.jpg)
Tapeworm and Humans
![Page 62: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/62.jpg)
Tapeworms and Humans
![Page 63: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/63.jpg)
Tapeworms and Humans
![Page 64: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/64.jpg)
Tapeworms and Humans
![Page 65: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/65.jpg)
Cuckoo and Warbler
![Page 66: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/66.jpg)
Cuckoo birds and warblers
![Page 67: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/67.jpg)
Cuckoo and Warbler
![Page 68: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/68.jpg)
Cuckoo and Warbler
![Page 69: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/69.jpg)
Ticks
![Page 70: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/70.jpg)
Tick
![Page 71: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/71.jpg)
Even Athletes foot is a parasite
![Page 72: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/72.jpg)
Parasitism
![Page 73: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/73.jpg)
Parasitism
![Page 74: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/74.jpg)
Symbiosis
![Page 75: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/75.jpg)
Habitat
One habitat might contain hundreds or even thousands of species. A
rotting log in a forest can be home to many species of insects, including
termites that eat decaying wood and ants that feed on the termites. Other species that live on and under rotting
log include millipedes, centipedes, spiders, and worms.
![Page 76: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/76.jpg)
Niche
You might think that competition for resources would make it impossible for
so many species to live in the same habitat. However, each species has
different requirements for its survival. As a result, each species has its own niche. An organism’s niche is its role
in its environment – how it obtains food and shelter, finds a mate, cares for its
young, and avoids danger.
![Page 77: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/77.jpg)
Niche
![Page 78: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/78.jpg)
Predator and Prey
An organism’s niche includes how it avoids being eaten and how it
finds or captures its food. Predators are
consumers that capture and eat other
consumers. The prey is the organism that is
captured by the predator.
![Page 79: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/79.jpg)
Predator and Prey
The deer is being eaten by the python. It
is prey.
The python has captured and is eating the deer.
![Page 80: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/80.jpg)
Predator and Prey
Predator
Prey
![Page 81: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/81.jpg)
Predator and Prey
PredatorPrey
![Page 82: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/82.jpg)
Predator and Prey
Prey Predator
![Page 83: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/83.jpg)
Predator and Prey
This alligator is the predator. It eats the
python.
This python is the prey. It is eaten by
the alligator.
![Page 84: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/84.jpg)
Predator and Prey
This python swallowed the
alligator. It is the predator.
This alligator was swallowed by the python. It was the
prey.
The alligator did get some revenge. The meal was too big for
the python and caused it bust.
![Page 85: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/85.jpg)
Lynx vs. Hare
![Page 86: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/86.jpg)
Predator/Prey Relationship
![Page 87: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/87.jpg)
Predator/Prey Relationship
![Page 88: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/88.jpg)
Predator/Prey Relationship
The presence of predators usually increases the number of different
species that can live in an ecosystem. Predators limit the size
of prey populations. As a result, food and other resources are less
likely to become scarce, and competition between species is
reduced.
![Page 89: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/89.jpg)
Cooperation
Individual organisms
often cooperate in
ways that improve survival.
![Page 90: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/90.jpg)
Whitetail Deer Cooperation
Whitetail Deer – Whitetail deer will lift their tail to alert others when they feel threatened.
![Page 91: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/91.jpg)
Ants and Honeybees
• Ants and honeybees live in social groups. Certain individuals have specific jobs within the colony.– Soldiers – Protection of
colony– Workers – gather food
and take care of young (larva)
![Page 92: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/92.jpg)
Cooperation
These cooperative actions improve
survival and are a part of the specie’s
niche.
![Page 93: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/93.jpg)
Section Summary
• All life requires a constant supply of energy.
![Page 94: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/94.jpg)
Section Summary
• Most producers make food by photosynthesis using light energy.
![Page 95: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/95.jpg)
Section Summary
• Consumers cannot make food. They obtain energy by eating producers and other consumers.
![Page 96: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/96.jpg)
Section Summary
• A food chain models the feeding relationships between species.
![Page 97: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/97.jpg)
Section Summary
• Symbiosis is any close relationship between species.
![Page 98: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/98.jpg)
Section Summary
• Mutualism, commensalism, and parasitism are types of symbiosis.
![Page 99: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/99.jpg)
Section Summary
• An organism’s niche describes the ways in which the organism obtains food, avoids danger, and finds shelter.
![Page 100: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/100.jpg)
Question
1. Explain why all consumers depends on producers for food.
![Page 101: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/101.jpg)
Question
2. Describe a mutualistic relationship between two imaginary organisms. Name the organisms and explain how each benefits.
![Page 102: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/102.jpg)
Question
3. Compare and contrast the terms habitat and niche.
![Page 103: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/103.jpg)
Question
4. A parasite can obtain food only from a host organism. Explain why most parasites weaken, but do not kill, their hosts.
![Page 104: Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities 7 th Grade Science Saint](https://reader036.vdocument.in/reader036/viewer/2022062314/56649e025503460f94aec626/html5/thumbnails/104.jpg)
This powerpoint was kindly donated to www.worldofteaching.com
http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.