Detritus Food Chain

Q. Why a much larger fraction of energy flows from detritus food chain than from grazing food chain in terrestrial ecosystem?

Q.

What is the aquatic food chain?

Q. Which one of the following is not an abiotic component of the ecosystem?

1. Water
2. Soil
3. Sunlight
4. Decomposer

Q.

Describe energy flow in a food chain.

Q.

The rate of decomposition of detritus is affected by te abiotic fractors like availability of oxygen, pH of the soil substratum, temperature etc. Discuss.

Q. Identify the type of food chain.

Dead animal →Blow fly maggots → Common frog → Snake

1. Grazing food chain

2. Decomposer food chain

3. Detrital food chain

4. Predator food chain

Q. food chain begins from dead and decaying matter. food chain starts with producers.

1. Grazing
2. Detritus
3. Producer
4. Consumer

Q. Major conduit of energy is ____i______ in land and ____ii______ in aquatic ecosystems.

1. i - grazing food chain, ii - detritus food chain
2. i - food web, ii - grazing food chain
3. i - detritus food chain, ii - grazing food chain
4. i - food web, ii - detritus food chain

Q.

Most animals that live in deep oceanic water are?

1. Detritivores

2. Tertiary consumers

3. Secondary consumers

4. Primary consumers

Q. Identify the type of food chain.

Dead animal →Blow fly maggots → Common frog → Snake

1. Aquatic food chain
2. Detritus food chain
3. Grazing food chain
4. Predator food chain

Q. Which one of the following is not a biofertiliser?
[1 mark]

1. Agrobacterium
2. Rhizobium
3. Nostoc
4. Mycorrhiza

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

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

Q. The breakdown of detritus into small particles by earthworm is a process called

1. mineralisation
2. catabolism
3. humification
4. fragmentation

Q. In parasitic food chain, the pyramid of numbers is

1. Upright
2. Inverted
3. Linear
4. Both A and B

Q. Producers in any grazing food chain

1. Clean the atmosphere
2. Capture solar energy
3. Feed the herbivores
4. Feed the carnivores

Q.

1. In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type. How is it inverted ? Cant it be spindle shaped too?

2.Which one of the following has the largest population in a food chain? shouldnt it be producers as decomposers are not included in the food chain?.

Q. Which one of the following is not a biofertiliser?

1. Agrobacterium
2. Rhizobium
3. Nostoc
4. Mycorrhiza

Q. Identify the correct type of food chain
Dead animal ---> Blowfly maggots ----> Common frog ---> Snake

1. Grazing food chain
2. Detrital food chain
3. Decomposer food chain
4. Predator food chain

Q.

1)Difference between detritus food chain (DFC) and grazing food chain (GFC)?

2)Represent detritus food chain by ray diagram ?

Q. Assertion : DFC may be connected to the GFC chain at some levels.
Reason : After death, organisms of GFC are acted upon by decomposers and some organisms of DFC are preyed upon by GFC animals.

Q. Write the names of aquatic organisms in order to form a food chain of at least three steps.

Q. The interior of a cow-dung pile kept for a few days is quite warm. This is mostly because

1. Cellulose present in the dung is a good insulator .
2. Bacterial metabolism inside the dung releases heat.
3. Undigested material releases heat due to oxidation by air.
4. Dung is dark and absorbs a lot of heat.

Q. What are the starting points of a grazing food chain and a detritus food chain respectively?

Q. Most animals that live in deep oceanic waters are:

1. Detritivores
2. Primary consumers
3. Secondary consumers
4. Tertiary consumers

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. Plants in general occupy the first level in a food chain, but in certain other type of food chain they occupy the second trophic level. Justify this statement and represent that type of food chain. (2 marks)

Q. Which of the following statements about the food chain is false?

1. Detritus food chain begins with dead organic matter
2. Carnivores are secondary consumers
3. Primary consumers are herbivores
4. Earthworm in detritus food chain is a primary producer

Q. The food chain in which microorganisms break down the energy rich compounds synthesized by producers is

1. Predator food chain
2. Parasitic food chain
3. None of the above
   
4. Detritus food chain

Q.

Identify the following food chain:

Dead animal ---> maggots ---> common frog --->snake

1. ​​​​​​Grazing food chain

2. ​​​​​​Predator food chain

3. ​​​​​​Parasitic food chain

4. ​​​​​​Detritus food chain