Catalyst: Answer the following questions silently in your binder. Raise your hand if you have a question.

Copy the following quiz question onto your catalyst.

1. Underline the question and put a box around the important information.2. Eliminate all incorrect answers. For at least one choice you eliminate, explain WHY in one sentence.3. Circle the correct answer and explain WHY it is correct.

FOCUS

6d.1 - I can illustrate the importance of biogeochemical cycles by drawing diagrams of the water, carbon, nitrogen,

and oxygen cycles and labeling areas of human impact.

Matter cycles

Energy Flows

Matter - any physical substance

Law of conservation of mass: matter is neither created nor destroyed

- mass can change forms ex.: from oxygen in a water molecule to oxygen in the air

Law of conservation of energy:energy is neither created nor destroyed

- energy can change forms - ex.: from chemical energy in food to heat energy; heat leaves the Earth

!

Other biogeochemical

cycles

Nitrogen cycle- protein in organisms- N2 in the air (78% of air)- bacteria convert nitrogen

Carbon cycle- carbohydrates in organisms- CO2 in the air - stored in ocean and rock

N - 78C - 77

How do photosynthesis

and cellular respiration

contribute to nutrient cycles?

6 CO2

6 H2O

6 O2

PhotosynthesisProducers only

Cellular respirationAll organisms

Exit Slip1. Explain the phrase “energy flows while matter cycles.”

2. Why are producers and decomposers essential for matter cycling?

3. Give one similarity between the water, carbon, and nitrogen cycles. Then give one difference for each cycle.

4. How are photosynthesis and cellular respiration involved in the water and carbon cycles?

5. How do humans impact the water, carbon, and nitrogen cycles?