Which one of the following processes during decomposition is correctly described?
Fragmentation - Carried out by organisms such as earthworm
Humification - Leads to the accumulation of a dark coloured substance humus, which undergoes microbial action at a very fast rate
Catabolism - Last step in the decomposition under fully anaerobic condition
Leaching - Water soluble inorganic nutrients rise to the top layers of soil
A.
Fragmentation - Carried out by organisms such as earthworm
Fragmentation is one of the step of decomposition. In this, detritus is converted into small fragments.
Humification leads to dark coloured amorphous substance called humus that is highly resistent to microbial action and undergoes decomposition at an extremely slow rate.
Catabolism is the set of metabolic pathways that breaks down molecules into smaller units to release energy.
Leaching refers to the loss of water soluble plant nutrients from the soil due to rain and irrigation.
Trophic levels in ecosystem is formed by
only bacteria
only plants
only herbivores
organisms linked in food chain
Main cause of eutrophication is
fluctuation of temperature
unusual growth of aquatic vegetations
enrichment of nutrients
abundance of microorganisms
Secondary productivity is rate of formation of new organic matter by
producer
parasite
consumer
decomposer
Identify the correct type of food chain
Dead animal > Blow fly maggots > Common frog > Snake
Grazing food chain
Detrital food chain
Decomposer food chain
Predator food chain
