Trophic Levels

Q.

Explain different types of consumers found in an ecosystem.

Q.

What is the basis for the categorization of producers, consumers and decomposers in an ecosystem?

1. Mode of digestion

2. Mode of obtaining sustenance

3. Mode of habitat

4. Patterns of growth

Q.

Which of the following correctly represents the order of trophic levels?

1. Producer, Primary consumer, Secondary consumer, Tertiary consumer

2. Primary consumer, Secondary consumer, Tertiary consumer

3. Producer, Secondary consumer, Primary consumer, Tertiary consumer

4. None of the above

Q.

What are consumers? How are they categorised?

Q.

Maximum solar energy is trapped by:

1. (a) Planting trees

2. (b) Cultivating crops

3. (c) Growing algae in tanks

4. (d) Growing grasses

Q.

What are consumers?

Q.

Humans cannot digest high fibre containing substances like grass. This is because humans:

1. Have longer alimentary canal than herbivores.

2. Have evolved to have only cooked leaves.

3. Do not produce cellulose digesting enzymes.

4. Have shorter alimentary canal than herbivores.

Q.

Are Humans Producers or Consumers?

Q.

The place of human being in food chain in an ecosystem is as a :

(a) producer (b) consumer

(c) decomposer (d) both (a) & (b).

Q.

The plants trap ____________ energy and convert it into ____________ energy.

Q.

Every food chain starts from____________.

Q.

Which of the following organisms return the nutrients to the soil?

1. Primary Consumers

2. Decomposers

3. Tertiary Consumers

4. Producers

Q. Match the following living beings to the terms (levels) of a food chain:

$\text{Puma},\text{Fungi},\text{Rabbit},\text{and Grass}$

1. Producer: $\text{Puma}$
   Primary consumer: $\text{Rabbit}$
   Secondary consumer: $\text{Fungi}$
   Tertiary consumer: $\text{Grass}$
2. Producer: $\text{Grass}$
   Primary consumer: $\text{Rabbit}$
   Secondary consumer: $\text{Puma}$
   Decomposer: $\text{Fungi}$
3. Producer: $\text{Rabbit}$
   Primary consumer: $\text{Grass}$
   Secondary consumer: $\text{Fungi}$
   Decomposer: $\text{Puma}$
4. Producer: $\text{Grass}$
   Primary consumer: $\text{Rabbit}$
   Secondary consumer: $\text{Puma}$
   Tertiary consumer: $\text{Fungi}$

Q.

The various steps in the food chain are called____.

1. Trophic levels

2. Energy levels

3. Nutrition levels

4. Ecosystem levels

Q.

Despite occupying 70 percent of the surface the productivity of the ocean is less. Why?

Q.

Differentiate between the producers and consumers.

Q. Plants in an ecosystem are called as producers. Give scientific reasons.

Q.

Do living things eat the same kind of food?

Q.

Carnivores are also called consumers.

1. True
2. False

Q. Producers in an ecosystem are

1. Organisms that can be used as manures
2. Animals in the food chain which produce more energy than they consume
3. Animals which cause an increase in biomass by rapid multiplication
4. Green organisms which fix solar energy by photosynthesis

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

1. Benthos
2. Zooplankton
3. Plankton
4. Phytoplankton

Q.

Name one organism for primary consumers.

Q. Mr X is eating curd/yoghurt. For this he is occupying trophic level

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

Q. Complete the trophic levels in the following basic food chain
Producers $\to$ (i) $\to$ Secondary consumers $\to$ (ii) $\to$ Decomposers

1. (i)Insectivores, (ii)Carnivores
2. (i)Carnivores, (ii)Herbivores
3. (i)Primary consumers, (ii)Tertiary consumers
4. (i)Tertiary consumers, (ii)Primary consumers

Q. Grass $\to$ Grasshopper $\to$ Mouse $\to$ Snake $\to$ Hawk
Which organism in the food chain is an herbivore and why?

1. Grass because it is the base of the food chain.
2. Grasshopper because it eats grass.
3. Snake because it is eaten by a hawk.
4. Mouse because it is eaten by a snake.
5. Hawk because it is at the top of the food chain.

Q. Very Short Answer Type Questions :
Which organism belongs to the first trophic level in the. food chain comprising the following rats, plants, hawks, snakes?

Q.

________ are carnivores that feed on dead animals.

Q. What does a food chain always start with -

1. The herbivore
2. The carnivore
3. The producer
4. None of them

Q. In a food chain, grasshoppers are eaten by frogs which in turn are eaten by snake. Which trophic level does snake belong to?

1. Primary consumer
2. Secondary consumer
3. Producer
4. Tertiary consumer
5. Decomposer

Q.

Eichhornia crassipes come from which country?