Concept of Trophic Levels

Q.

What is the ecological balance?

Q. The primary producers of the deep sea hydrothermal vent ecosystem are

1. Green algae
2. Blue green algae
3. Coral reefs
4. Chemosynthetic bacteria

Q.

These belong to the category of primary consumers:

1. Eagle and snakes

2. Snakes and Frogs

3. Insects and cattle

4. Lion and cheetah

Q. Primary productivity of plants in an ecosystem depends on :

1. A variety of environmental factors
2. Availability of nutrients
3. Photosynthetic capacity of plants
4. All of the above

Q.

Are dead things biotic?

Q.

Which of the trophic levels has the most individuals?

Q. Generally in a food chain the largest population is that of

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

Q.

Name two primary consumers.

Q. Which of the following statements about productivity is true?

1. Primary productivity of all ecosystems is a constant
   
2. Annual net primary productivity of the whole of the biosphere is 17 billion tons (dry weight) of organic matter.
3. Gross primary productivity is the amount of biomass available for consumption by carnivores.
   
4. Primary productivity depends upon the plant species inhabiting a particular area.
   

Q.

Which of the following terms does NOT apply to humans?

1. heterotrophs

2. primary producers

3. secondary consumers

4. primary consumers

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. Barnacle, crab, periwinkle
4. Crab, dogfish, periwinkle

Q.

All consumers are autotrophs.

1. True
2. False

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.

Each step of a food chain represents:

1. Sere

2. Trophic level

3. Consumers

4. Food web

Q.

Which of the following belong to the same trophic level: grasshopper, spider, grass, hawk, lizard?

Q. Write a common food chain of a pond ecosystem having four links.​

Q. Assertion (A): Primary productivity generally increases from the polar regions towards the tropics.
Reason (R): Primary productivity of an ecosystem depends on the plant species inhabiting it, angle of inclination of sun, availability of nutrients, etc.

1. Both assertion and reason are true and the reason is the correct explanation for the assertion
2. Both assertion and reason are true but the reason is not the correct explanation for the assertion
3. Only assertion is true
4. Both assertion and reason are false

Q.

Carnivores belong to which trophic level?

1. Producers

2. Primary consumers

3. Secondary consumers

4. Decomposers

Q. Bamboo plant is growing far from forest then what will be the trophic level of it?

1. First trophic level $\left(T_1\right)$
2. Second trophic level $\left(T_2\right)$
3. Third trophic level$\left(T_3\right)$
4. Fourth trophic level $\left(T_4\right)$

Q. Bacteria and fungi are

1. Primary consumers
   
2. Decomposers
   
3. Secondary consumers
4. Scavengers

Q. Trophic levels are formed by

1. Only plants
2. Only animals
3. Only carnivores
4. Organisms linked in the food chain

Q. The dominant second trophic level in a lake ecosystem is:

1. Zooplanktons
2. Fishes
3. Phytoplanktons
4. Frogs

Q. Fill in the following blanks with suitable words:​ ​
(b) In nature, all green plants are _______ whereas animals are consumers.​

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

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

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.

The first order consumers are called:

1. Producers

2. Herbivores

3. Autotrophs

4. Chemotrophs

Q.

Bamboo trees growing in a fir (species of evergreen coniferous trees) forest belong to which trophic level ?

1. Third trophic level (T3)

2. First trophic level (T1)

3. Second trophic level (T2)

4. Fourth trophic level (T4)

Q. Bamboo plant is growing far from forest then what will be the trophic level of it?

1. First trophic level $\left(T_1\right)$
2. Second trophic level $\left(T_2\right)$
3. Third trophic level$\left(T_3\right)$
4. Fourth trophic level $\left(T_4\right)$

Q. Match column I with column II, and choose the correct combination from the options given below.

	Column I		Column II
a	Detritivore	1	Bacteria
b	Decomposer	2	Earthworm
c	Nutrient cycling	3	Cockroach
d	Omnivore	4	Ecosystem service

Q.

Draw the diagram of the trophic level.