1. 1.2
Ecosystems

2. Habitat vs. Ecosystem

3. OXYGEN  Plants and animals cannot survive without oxygen
HOW IS IT REPLENISHED?
PHOTOSYNTHESIS! (what else does this require?)
What is the formula for photosynthesis?
6H2O + 6CO2 + E  6O2 + C6H12O6
6O2 + C6H12O6  6H2O + 6CO2 + E
6CO2 + E  6O2 + 6H2O + C6H12O6
6O2 + 6H2O + C6H12O6  6CO2 + E
(you will be required to know this!!)

5. The cells of most living things contain between 50 and 90 percent water.
Without water, no organism would survive
Water also carries nutrients from one place to another in ecosystems

6. Nutrients such as nitrogen and phosphorus are chemicals that are required for plant and animal growth

7. Light is required for photosynthesis
converts solar energy into chemical energy usable by plants

8. Soil provides nutrients for plants and supports many species of small organisms
Soil anchors plants in one place and absorbs and holds water

9. Soil organisms maintain soil structure.
A square metre of soil may contain as many as 1000 different species of invertebrates!
Soil organisms maintain soil structure.
earthworms dig tunnels through the soil
allow water and nutrients to move more easily
Some soil organisms, such as bacteria, break down pollutants,

11. Let’s watch a little video…
Symbiosis Mutualism Commensalism Parasitism

12. Head louse
Lives on the human scalp
Louse feeds exclusively on human blood
Humans lose blood and sometimes get infections
A) Commensalism C) Parasitism
B) Mutualism D) None of the above

13. Many sloths have algae growing in their fur
Many sloths have algae growing in their fur. The algae live on the heat, humidity and food source provided in the sloth’s fur, and the sloth becomes camouflaged against tree trunks with the green tinge to their fur.
A) Commensalism C) Parasitism
B) Mutualism D) None of the above

14. Which of the following lists is correctly organized from largest to smallest in size?
Ecosystem, biome, community, population, single species
Biome, community, ecosystem , population, single species
Biome, ecosystem, community, population, single species
Biome, ecosystem, population, community, single species

15. A) Commensalism C) Parasitism B) Mutualism D) None of the above
Barnacles hitch rides on whales to travel and reproduce in new areas
The whale is not bothered by the barnacles, but they also don’t do anything helpful for the whale
A) Commensalism C) Parasitism
B) Mutualism D) None of the above

16. A) Commensalism C) Parasitism B) Mutualism D) None of the above
The Cuckoo bird lays eggs amongst Reed Warbler eggs. The Warbler mother hatches and raises the young Cuckoo bird.
A) Commensalism C) Parasitism
B) Mutualism D) None of the above

17. A) Commensalism C) Parasitism B) Mutualism D) None of the above
Bees gather nectar from flowers which they make into food, and in return the flowers get pollinated
A) Commensalism C) Parasitism
B) Mutualism D) None of the above

18. REMINDER… TEST NEXT WEEK!!!