Concept of Trophic Levels

Q.

Which of the following organisms occupy more than one trophic level in a pond ecosystem?

1. Phytoplankton
2. Zooplankton
3. Frog
4. Fish

Q.

6. Give two examples each of producers, consumers and decomposers.

Q.

The biotic environment includes

1. Producers

2. Consumers

3. Decomposers

4. All of the answers

Q.

Man is omnivorous.

1. True
2. False

Q. Assertion [A]: Trophic level represents a functional level, not a species as such.

Reason [R]: A given species may occupy more than one trophic level in the same ecosystem at the same time.

1. Both statements A and R are incorrect.
2. Both statements A and R are correct and statement R is not the explanation of statement A.
3. Statement A is correct and statement R is incorrect.
4. Both statements A and R are correct and statement R is the correct explanation of statement A.

Q.

What is the first trophic level in a lake ecosystem?

1. Phytoplankton

2. Benthos

3. Plankton

4. Zooplankton

Q. Which of the following occupies the same trophic level?

1. Crow and cow
2. Snake and earthworm
3. Tiger and wild boar
4. Deer and bee

Q.

Mr X is eating curd/yoghurt. For this food intake in a food chain, which of the following trophic level will he occupy?

1. Third trophic level
2. First trophic level
3. Fourth trophic level
4. Second trophic level

Q.

Are humans omnivores?

Q.

Various steps in a food chain represent a

1. Food web

2. Trophic level

3. Ecosystem

4. Biomagnification

Q.

Consider the following food chains:

Grass-----> cow-------> tiger

What will happen if the tigers are removed from the above food chain?

Q.

Define ecosystem. Explain its biotic and abiotic components taking suitable examples.

Q. An ecosystem has mice. What happens if more cats are added to it?

Q.

The dominant second trophic level in a lake ecosystem consists of

1. The biotic components are almost similar
2. The abiotic components are almost similar
3. Primary and secondary consumers are similar
4. Both biotic and abiotic components are different

Q.

Both plants and flesh-eating animals are known as___________________ .

Q. In which of the following weeds are placed?

1. Primary producers
2. Secondary consumer
3. Primary consumer
4. Decomposer

Q.

Which is the second trophic level in the aquatic ecosystem?

Q.

Discuss the biotic and abiotic components of the ecosystem.

Q. In an ecosystem, those carnivores which generally do not get preyed upon by predators are known as “top carnivores”.

1. True
2. False

Q.

Organisms of a higher trophic level that feed on several types of organisms belonging to a lower trophic level constitute the

1. Food web

2. Ecological pyramid

3. Ecosystem

4. Food chain

Q. Food chains are made up of____.

1. trophic levels
2. food web
3. ecosystems
4. community

Q.

Pyramid of energy in an aquatic ecosystem is always ___ .

1. Inverted

2. Upright

3. Linear

4. Irregular

Q.

Which of the following autotrophs are the dominant producers of marine ecosystems?

1. benthic brown algae, coastal red algae and daphnids
2. benthic diatoms and marine viruses
3. sea grasses and slime moulds
4. free floating, micro algae, cyanobacteria and nanoplankton

Q. What do you understand by food web?

Q. Which of the following is the trophic level of an orchid growing on a mango tree?

1. First
2. Tertiary/ Third
3. Second
4. Fourth

Q. In a food chain, the third trophic level is always occupied by

1. Carnivores
2. Herbivores
3. Decomposers
4. Producers

Q.

Trophic level means _____.

1. Stage in a food chain

2. Stage in an ecological niche

3. Axis around earth

4. Energy level in a food web

Q. An ecosystem has mice. What happens if more cats are added to it?

Q.

Nepenthes belongs to the category of

1. primary consumer

2. producer

3. secondary consumer

4. both b and c

Q.

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

1. 1%

2. 10%

3. 40%

4. 90%