1. Energy REVIEW The ultimate source of energy for all ecosystems is:
plants
the sun
lightning
All food chains begin with:
The sun
Herbivores
Plants
Why?
Green plants can use the sun’s energy to make food (glucose).

2. Photosynthesis Try to write the equation:
CO2 + Water + Sunlight  Glucose +Oxygen
Plants use:
carbon dioxide, water and sunlight
Plants make:
glucose and oxygen
Chlorophyll
Green chemical in plants
Helps plants perform photosynthesis

3. Cellular Respiration Cellular Respiration makes:
Try to write the equation for cellular respiration:
Glucose + Oxygen  Energy + Water + CO2
Cellular Respiration makes:
ENERGY for cell processes
What sorts of organisms perform cellular respiration.?
ALL living things

4. Cycling of Gases
Photosynthesis and Cellular Respiration exchange two gases:
Oxygen
Used by all living things in cellular respiration
Carbon dioxide
Used by plants in photosynthesis

5. Use vocabulary words to describe each circled organism.
Food Web

6. Answers from Food Web
The fox is a carnivore since it eats birds and squirrels
The grass/plant is a producer
The spider and squirrels are both herbivores because they eat only plants

7. Energy Pyramid shows the flow of energy in an ecosystem
The greatest amount of energy is found at the bottom of the energy pyramid
The sun is the original source of all energy!
___________
__________
_________

8. Energy Pyramid shows the flow of energy in an ecosystem
The greatest amount of energy is found at the bottom of the energy pyramid
The sun is the original source of all energy!

9. Decomposers Include fungi (such as mushrooms) and bacteria
Decomposers break down dead organisms
Decomposers return nutrients to the soil.
___________
___________
___________
___________

10. Let’s Review! An insect that eats just grass is a(n)… Herbivore
An insect that eats other insects is a(n)…
Carnivore
An insect that eats both grass and other insects is a(n)…
Omnivore

11. Predator and Prey A lion chases and kills a zebra
The lion = the predator
The zebra = the prey
___________
___________

12. Resources Resources are things organisms need for survival Name some….
Food
Water
Shelter
Mates

13. Limiting Factors
Limiting Factors are things that limit (negative impact on) a population’s growth
Name some limiting factors
Overpopulation
Lack of resources
Increased predation
Disease
Hunting
Parasitism

14. Negative Effects of Overpopulation
Fewer Resources
More competition
Diseases spread more quickly
Starvation