1. Chapter 2.1 & 2.2 Test Review
7th Grade Science

2. To compost, or not to compost? That is the question.
Can Compost
CAN NOT Compost
Shredded paper
Meat
Grass trimmings
Candy wrappers
Coffee grounds
Aluminum can

3. Composting Info
Composting is the process of decomposing organic waste.
Compost should contain ¼ green stuff and ¾ brown stuff to be considered healthy.
Nitrogen-rich material is known as green stuff in a compost bin.
Carbon-rich material is known as brown stuff in a compost bin.

4. Cellular Respiration
Cellular respiration is the process in which organisms break down food to release energy called ATP.
Cellular respiration takes place in the mitochondria.
Cellular respiration is considered the opposite of photosynthesis.

5. What do you know about photosynthesis?
Reactants needed:
Sunlight (radiant energy from the sun)
Chlorophyll
Carbon dioxide
Water
Chemical equation: 6CO2 + 6H2O > C6H12O6 + 6O2

6. Can I take your photo?
A phototroph is any organism that makes its food using photosynthesis.
Plants look green due to the pigment chlorophyll, which reflects green light.
About 90% of our oxygen in the air is a result of photosynthesis.
The structure that photosynthesis occurs in is the chloroplast.

7. More photosynthesis information!
Water enters a plant through the roots and is transported through tubes called xylem.
Phloem tubes transport glucose to areas of the plant where it is needed.
Photosynthesis produces oxygen and glucose.
During photosynthesis, energy is transformed from radiant to chemical energy.

8. Low or high turgor pressure?
When a plant begins to wilt, it is experiencing low turgor pressure. When a plant is healthy, it is experiencing high turgor pressure.
Stomata are the tiny openings in plant leaves that take in carbon dioxide and release oxygen and water vapor.
Glucose is also known as:
Sugar
Carbohydrates
Plant food

9. The Wonderful Water Cycle
The water cycle includes 3 processes:
Evaporation: The process of changing liquid water into water vapor
Condensation: Water vapor changing into liquid water
Precipitation: Process in which water falls from clouds to earth.
Rain
Snow
Sleet
Hail

10. What just transpired?
The release of water vapor from leaves and stems of plants is called transpiration.

11. Did someone say nitrogen?
Nitrogen is an essential part of proteins and DNA.
After the death of an organism, nitrogen gets returned to the soil by decaying waste or decomposers.
Nitrogen-fixing bacteria turn atmospheric nitrogen into usable nitrogen compounds. This process is called denitrification.