AP BIOLOGY

ECOLOGY

CHEMICAL CYCLES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Carbon dioxide (CO2) is returned to the atmosphere primarily by
A
Consumption
B
Combustion and cellular respiration
C
Waste elimination
D
Photosynthesis
Explanation: 

Detailed explanation-1: -Photosynthesis removes Carbon Dioxide from the atmosphere turning the Carbon into Carbohydrates, such as cellulose found in wood. Cellular Respiration, burning coal, wood, gasoline, turn the Carbon-based molecules back into Carbon Dioxide and water. These Oxidation reactions return the Carbon Dioxide to the atmosphere.

Detailed explanation-2: -The process of respiration produces energy for organisms by combining glucose with oxygen from the air. During cellular respiration, glucose and oxygen are changed into energy and carbon dioxide. Therefore, carbon dioxide is released into the atmosphere during the process of cellular respiration.

Detailed explanation-3: -Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.

Detailed explanation-4: -The burning of fossil fuels such as coal, and petroleum and the burning of wood and other carbon-containing substances such as forest fires, etc, produces carbon dioxide which returns into the atmosphere.

Detailed explanation-5: -Cellular respiration uses glucose and oxygen to make carbon dioxide, water, and ATP. The molecule ATP is used for energy to run cellular processes. Carbon dioxide is released to the atmosphere where it is used in photosynthesis by plants. The process of photosynthesis uses ATP for energy to build glucose.

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