Biogeochemical Cycles Assessment

The video tutorial explains the concept of mineral cycles within ecosystems, focusing on the carbon, oxygen, sulfur, and nitrogen cycles. It describes how these minerals circulate through various processes such as photosynthesis, respiration, and decomposition, emphasizing their importance in maintaining ecological balance. The tutorial also highlights the role of human activities, like burning fossil fuels, in these cycles and the formation of acid rain in the sulfur cycle.

What is the primary role of minerals in an ecosystem?

• To create new ecosystems

• To recycle nutrients within the ecosystem

• To eliminate waste from the ecosystem

• To provide energy to organisms

Which process is NOT involved in the carbon cycle?

• Photosynthesis

• Combustion

• Evaporation

• Respiration

Which of the following is a result of burning fossil fuels in the carbon cycle?

• Increased carbon dioxide levels

• Decreased carbon dioxide levels

• Decreased nitrogen levels

• Increased oxygen levels

How do plants contribute to the oxygen cycle?

• By releasing oxygen during photosynthesis

• By absorbing oxygen from the atmosphere

• By converting oxygen into carbon dioxide

• By storing oxygen in their roots

What is the role of animals in the oxygen cycle?

• They produce oxygen

• They convert oxygen into carbon dioxide

• They store oxygen

• They eliminate oxygen

What is a major source of sulfur in the sulfur cycle?

• Plant decay

• Animal respiration

• Volcanic activity

• Photosynthesis

What happens to sulfur dioxide in the atmosphere during the sulfur cycle?

• It evaporates

• It turns into nitrogen

• It becomes oxygen

• It forms acid rain

What is the main form of nitrogen found in the atmosphere?

• Nitrate

• Nitrite

• Ammonia

• Nitrogen gas

What percentage of the atmosphere is composed of nitrogen?

• 50-60%

• 60-70%

• 80-90%

• 70-80%

Which process converts ammonia into nitrates in the nitrogen cycle?

• Respiration

• Photosynthesis

• Nitrification

• Combustion