Detritus Food Chain

Q. Which of the following is incorrect with respect to the detritus food chain?

1. Primary source of energy is the sun
2. It is composed of detritus-eating organisms
3. In tropical rainforests more energy flows into this chain
4. They produce nutrients for autotrophs

Q.

What is food chain? Mention the basic principle. Give example.

Q.

A series of organisms that are linked to each other through a process of eating and being eaten form a

1. Food net

2. Food chain

3. Food web

4. None of these

Q. From which of the following will the detritus food chain start?

1. Algae
2. Bacteria
3. Protozoa
4. Virus

Q. Build up of organic material in soil is under which of the following conditions to

1. $<{10}^{o}C$ temperature, Absence of oxygen.
2. Warm temperature, Humid environment
3. Aerobic conditions, $>{25}^{o}C$ temperature
4. Nitrogen rich detritus, optimum moisture

Q. Identify the type of food chain.

Dead animal →Blow fly maggots → Common frog → Snake

1. Decomposer food chain

2. Detrital food chain

3. Grazing food chain

4. Predator food chain

Q. A series of organisms feeding on one another at various biotic levels form a

Q. Marine plants grow in marine ecosystems. Shallow water contains small fishes, prawns feeding on algae. The central part of sea has less number of aquatic living organisms. ____________ are secondary consumers in such ecosystems. Ocean has a large amount of nutrients. The bottom of oceans has more number of decomposers.

1. Planktons
2. Large Fishes
3. Small Fishes
4. All of these

Q. The important step(s) in the process of decomposition is/are ____________________.

1. Fragmentation and mineralization
2. All of the above
3. Leaching and Catabolism
4. Luminification and Mineralization

Q.

The breakdown of detritus into smaller fragments by detritivores is called as

1. ​​​​​​Humification

2. ​​​​​​Mineralisation

3. Fragmentation

4. ​​​​​​Leaching

Q.

___ indicates who eats whom in an ecosystem.

1. Food pyramid

2. Biomass

3. Trophic level

4. Food chain

Q. What starts the food chain?

Q. Marine plants grow in marine ecosystems. Shallow water contains small fishes, prawns feeding on algae. The central part of sea has less number of aquatic living organisms. ____________ are secondary consumers in such ecosystems. Ocean has a large amount of nutrients. The bottom of oceans has more number of decomposers.

1. Planktons
2. Large Fishes
3. Small Fishes
4. All of these

Q. Which one of the following processes during decomposition is correctly described?

1. Fragmentation - Carried out by organisms such as earthworm
2. Humification - Leads to the accumulation of a dark-colored substance humus which undergoes microbial action at a very fast rate
3. Catabolism - Last step in the decomposition under fully anaerobic condition
4. Leaching - Water soluble inorganic nutrients rise to the top layers of soil

Q. Which one of the following is incorrect with respect to the decomposition process?

1. Humification - leads to the accumulation of a dark coloured humus which undergoes microbial action at a very fast rate.
2. Leaching - water soluble inorganic nutrients leach to the upper layers of soil by percolation of water into soil particles.
3. Fragmentation - Carried out by organisms such as earthworms.
4. Catabolism - last step of decomposition carried out by saprophytic organisms.