Upload
lilia
View
34
Download
1
Tags:
Embed Size (px)
DESCRIPTION
Warm - Up: 1) What is the difference between a chain and a web? 2) In 2 minutes, write a definition for each, and compare what you wrote with the person sitting next to you. April 29 th , 2013. April 29 th , 2013. The following slides are numbered 1-24. For today’s assignment: - PowerPoint PPT Presentation
Citation preview
April 29th, 2013
• Warm - Up:1) What is the difference between a chain and a web?
2) In 2 minutes, write a definition for each, and compare what you wrote with the person sitting next to you.
April 29th, 2013• The following slides are numbered 1-24.
For today’s assignment:
Write the number and an answer to the question (don’t write the question)
How do biotic compare to abiotic?• All living parts of
a habitat– Plants– Animals– Bacteria
• All non-living parts of a habitat- Water- Soil- Rocks- Fire
1 Factors in an ecosystem:
Are these animals biotic or abiotic factors?
2
Biotic or Abiotic?3
Biotic or Abiotic?4
Biotic or Abiotic?5
Biotic or Abiotic?6
Why are plants called producers?
• The ultimate source of life is the sun
• Plants use the sun’s energy to make food in a process called photosynthesis
• Examples- cactus, trees, algae, phytoplankton
7
energy +CO2 +H2O = sugar + O2
“plant food”
What are consumers?• Herbivores-
plant-eaters
• Carnivores- meat-eaters
• Omnivores- eat plants & meat
• Scavengers – a carnivore that feeds on body of dead organism
• Decomposers- organisms that break down wastes & dead organisms & return materials to ecosystem
8
What is a food chain?
• A sequence that links a species by its feeding relationships
• Example: grass cottontail hawk
9
What is a food web?• Model that shows
the network of feeding relationships, and the flow of energy in the ecosystem
• Food webs show all the connected food chains
10
11 What do decomposers eat?
April 30th, 2013• Today’s Warm-Up Draw two food chains
for two different carnivores.AGENDA• Any presentations?• The following slides are numbered 13-24. For
today’s assignment:Write the number and an answer to the question (don’t write the question)
• QUIZ using ecosystems poster
What is an energy pyramid?• Diagram that
compares energy used by producers, primary consumers, and secondary consumers
• Each level is a called a trophic level, and it is occupied by an organism
12
What happens at each feeding level?• Energy is lost as it flows UP a level• Carnivores are at the top• Herbivores are at the 2nd level• Producers are at the bottom
13
14 Why are bears at the top?
15 Why are there so many producers?
Reef SharkThe reef shark gets energy by
eating parrotfish and triggerfish.
16 Is this a producer or a consumer?
TriggerfishThe triggerfish gets energy by
eating shrimp.
17 Producer or Consumer?
ShrimpThe shrimp gets energy by eating
phytoplankton.
18 Producer or Consumer?
PhytoplanktonPhytoplankton get energy from
the sun.
19 Producer or Consumer?
Sea SpongeSea sponge gets energy by eating
zooplankton.
20 Producer or Consumer?
ZooplanktonZooplankton get energy by eating
phytoplankton.
21 Producer or Consumer?
ParrotfishThe parrotfish gets energy by
eating algae
22 Producer or Consumer?
Sea Turtle
The sea turtle gets energy by eating algae.
23 Producer or Consumer?
Algae
Algae get their energy from the sun.
24 Producer or Consumer?
food chain compared to food web• It moves like a
cycle• It has few
organisms– Plant to animal– Animal to
animal
• It goes in many directions
• It has many organisms- Plant to
animal 1, animal 2, …
Compare:
Both show what organisms eat, and the flow of energy
End.
April 30th, 2013• What features enable fish to survive
underwater? (Give two examples)• Why do snakes live so well in the desert?• Why do mosquitoes need people?
• For today’s assignment:Write the number and an answer to
the question (don’t write the question)