Food Chains

Q.

What are the trophic levels? Give an example of a food chain and state the different trophic levels in it.

Q.

Define trophic level.

Q.

Flow of energy in an ecosystem is always

1. Unidirectional

2. Bidirectional

3. Multidirectional

4. No specific direction

Q.

Name the type of food chain that exists in a pond.

Q.

Question 2
What is the role of decomposers in the ecosystem?

Q.

In the food chain given below, the cow occupies which trophic level?

Grass → Cow → Lion

1. First

2. Second

3. Third

4. Fourth

Q. Based on the given assertion and reason, choose the right option.
Assertion [A]: Decomposers are excluded from the food chains.
Reason [R]: Decomposers act at all trophic levels of food chains.

1. Both the A and R are true and R explains A
2. Both A and R are false
3. Both A and R are true and R does not explain A
4. A is true and R is false

Q.

An interaction in which one organism captures and eats another organism is called __________.

Q.

The source of energy for decomposers are the dead and decaying matter in the environment.

1. True
2. False

Q.

The energy transferred from a lower trophic level to the next higher level:

1. None

2. Increase

3. Remains the same

4. Decreases

Q. Food chain is a series of organisms in which each organism becomes a food source for the next one.

1. False
2. True

Q.

Which of the following can be an apex consumer?

1. Rabbit

2. Cow

3. Fish

4. Kingfisher

Q.

Question 8

Explain, why speed is important for survival in the grasslands for animals that live there.
(Hint: There are few trees or places for animals to hide in grasslands habitats.)

Q. The base of an energy pyramid represents the energy available within ___________.

1. primary consumers
2. primary producers
3. secondary consumers
4. tertiary consumers

Q.

Consumers that feed on carnivores are called _____.

1. primary consumers
2. secondary consumers
3. tertiary consumers
4. quaternary consumers

Q.

Describe, with the help of a diagram, the different stages of a food chain.

Q. Define food chain. How many types of food chain are there ? Give difference between food chain and food web. Draw a linear diagram of food chain.

Q.

Which one of the following correctly represents a food chain?

1. Grass-Grasshopper-Frog-Snake-Eagle

2. Grass-Grasshopper-Eagle-Snake-Frog

3. Grass-Eagle-Frog-Snake-Grasshopper

4. Grass-Snake-Frog-Eagle-Grasshopper

Q.

Rewrite following in correct sequence.

Lion→ Grass→ Goat.

Q.

Which of the following organisms is a producer?

1. the clouds

2. the atmosphere

3. the sun

4. soil and rocks

Q. Write the name and category of each of the components shown in the picture.

Q.

Which of the following are producers?

1. Carnivores

2. Herbivores

3. Green plants

4. Omnivores

Q. Give an example and construct a food chain. How it differs from food web?

Q.

What is food chain ?

Q. In the food chain-
$Grass\to deer\to lion,$ operating in a forest, what will happen if all the deer are removed?

Q.

Question 24

What are the specific features present in a deer that help it to detect the presence of predators like lion?

Q.

A snake feeding on a frog represents ______ carnivore.

Q.

Green plants always occupy the _______ trophic level.

1. fourth

2. third

3. first

4. second

Q.

How do you determine trophic levels?

Q.

A food chain in an ecosystem represents the __________________

1. feeding relationship
2. energy flow
3. ecological succession
4. (a) and (b) above.