Which of these is a biotic component of an ecosystem?
Water availability
Amount of sunlight
Number of plants
Which of these processes is NOT part of the carbon cycle?
Respiration
Precipitation
Photosynthesis
Which process occurs when water is absorbed into the ground?
Infiltration
Transpiration
Which process releases water vapour into the atmosphere?
Condensation
Which of these is the correct order of events for the water cycle when water from the ocean forms clouds?
Evaporation, cooling, condensation
Cooling, evaporation, condensation
Condensation, evaporation, cooling
Which of these substances contain nitrogen?
Proteins
Carbohydrates
Fats
What do nitrogen-fixing bacteria do?
They convert nitrates into nitrogen gas
They convert ammonia into nitrates
They convert nitrogen gas into nitrates
What do nitrifying bacteria do?
Which process removes carbon dioxide from the atmosphere?
Combustion
Which of these species are NOT decomposers?
Bacteria
Viruses
Fungi