Concept of Trophic Levels

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 correct and statement R is the correct explanation of statement A.
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 incorrect.

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. 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.

What is the first trophic level in a lake ecosystem?

1. Phytoplankton

2. Benthos

3. Plankton

4. Zooplankton

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%

Q. With respect to the given image, who is/are the tertiary consumers in this ecosystem?

1. Crab, dogfish, dogwhelk
2. Barnacle, crab, dogfish
3. Crab, dogfish, periwinkle
4. Barnacle, crab, periwinkle

Q.

Nepenthes belongs to the category of

1. primary consumer

2. producer

3. secondary consumer

4. both b and c

Q.

How many organisms in the given list are omnivores?

Rabbit, Sparrow, Hydra, Crow, Man, Fox, Cockroach, Bobcat

1. ​​​​​​Five

2. Four

3. ​​​​​​Three

4. ​​​​​​Six

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.

What is true of a ecosystem?

1. Inverted

2. Remains unchanged

3. vertical

4. Variable