Grade 10 Life Sciences Quiz: Nutrient Cycles

What is the process during which ammonia is processed to form nitrites and eventually nitrates?

• Denitrification

• Nitrification

• Decomposition

• Transpiration

Which gas is released in the atmosphere during photosynthesis?

• Nitrogen

• Oxygen

• Ammonia

• Carbon Dioxide

What is the term for the cyclic movement of water between the earth and the atmosphere?

• Water cycle

• Nitrogen cycle

• Carbon cycle

• Oxygen cycle

What is the main source of carbon used for the synthesis of organic compounds?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Water

Which process involves the conversion of ammonia and nitrates to free nitrogen gas?

• Photosynthesis

• Nitrification

• Denitrification

• Respiration

What is the process called when water is absorbed by the soil?

• Evaporation

• Infiltration

• Transpiration

• Condensation

Which organisms use oxygen to decompose organic matter?

• Plants

• Animals

• Decomposers

• Fungi

What is the term for the process where carbon is fixed in organic food?

• Photosynthesis

• Combustion

• Respiration

• Decomposition

Which of the following is a way carbon returns to the atmosphere?

• Infiltration

• Cellular respiration

• Nitrification

• Photosynthesis

What is the role of nitrogen-fixing bacteria?

• Convert nitrates to ammonia

• Convert free nitrogen to nitrates

• Decompose organic matter

• Absorb carbon dioxide