PS 6a Biogeochemistry

The ___ is the original source of energy for all the food we eat.

Tags

NGSS.MS-LS1-6

Why do leaves turn colors in the fall?

• Due to increased sunlight exposure
• Chlorophyll breaks down because there is less sunlight

• Because of increased water intake
• As a result of increased carbon dioxide levels

The ​ ​ (a)   is the ​ (b)   (does not need light) step of photosynthesis and happens in the ​ (c)  

• Calvin Cycle
• light-independent
• stroma

Tags

NGSS.MS-LS1-6

Which equation represents cellular respiration?

• C6H12O6 + 6O2 -> 6CO2 + 6H2O + energy (atp)

• C6H12O6 + 6O2 -> 6CO2 + 6H2O + NADH
• C6H12O6 + 6O2 -> 6CO2 + 6H2O
• C6H12O6 + 6O2 -> 6CO2 + 6H2O + ADP

Tags

NGSS.MS-LS1-7

NGSS.MS-LS2-3

In the Krebs cycle, how is citric acid formed?

• Through the condensation of acetyl-CoA and oxaloacetate
• Through the reduction of acetyl-CoA and oxaloacetate
• Through the oxidation of acetyl-CoA and oxaloacetate
• Through the hydrolysis of acetyl-CoA and oxaloacetate

Tags

NGSS.HS-LS2-3

The following are steps of cellular respiration except

• electron transport chain
• Krebs cycle
• glycolysis
• electrolysis

Tags

NGSS.HS-LS1-7

What is a product of photosynthesis?

• oxygen
• water
• glucose (sugar)

• carbon dioxide

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

How does hydrogen bonding affect water as it freezes?

• The contraction of water and its density increasing.
• The water molecules form rings and makes ice less dense so the ice floats.

• The formation of new chemical bonds.
• The increase in water's boiling point.

How do people affect the carbon cycle?

• People affect the carbon cycle by releasing carbon dioxide through respiration and decomposition.
• People affect the carbon cycle by reducing their energy consumption and using renewable energy sources.
• People affect the carbon cycle by planting more trees and increasing photosynthesis.
• People affect the carbon cycle through activities such as burning fossil fuels, deforestation, and industrial processes.