Unit 2 Exam - Matter & Energy

Front

What is the process of photosynthesis?

Back

Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose, using carbon dioxide and water, and releasing oxygen as a byproduct.

Front

What is cellular respiration?

Back

Cellular respiration is the process by which cells convert glucose and oxygen into energy (ATP), carbon dioxide, and water. It occurs in all living organisms.

Front

What is the role of decomposers in an ecosystem?

Back

Decomposers break down dead organic matter, recycling nutrients back into the ecosystem and transferring energy through the food web.

Front

How do photosynthesis and cellular respiration relate to each other?

Back

Photosynthesis converts light energy into chemical energy (glucose), while cellular respiration converts that chemical energy back into usable energy (ATP) for cells.

Front

What is the significance of dissolved oxygen in water?

Back

Dissolved oxygen is crucial for the survival of aquatic organisms, as it is required for cellular respiration.

Front

What factors can affect the concentration of dissolved oxygen in water?

Back

Factors include temperature, salinity, presence of plants (photosynthesis), and the amount of organic matter (decomposition) in the water.

Front

What is the chemical equation for photosynthesis?

Back

6CO2 + 6H2O + light energy → C6H12O6 + 6O2.

Front

What is the chemical equation for cellular respiration?

Back

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP.

Front

What is the difference between aerobic and anaerobic respiration?

Back

Aerobic respiration requires oxygen and produces more ATP, while anaerobic respiration occurs without oxygen and produces less ATP.

Front

What is the role of chlorophyll in photosynthesis?

Back

Chlorophyll is the green pigment in plants that absorbs light energy, primarily from the sun, to drive the photosynthesis process.