Food Chain

Q.

What is the definition of a food chain, a food web, and a food pyramid?

Q.

Interconnected food chains are called ________.

Q.

Food chain begins with :

(a) respiration (b) photosynthesis

(c) decomposition (d) decay.

Q.

Draw a simple diagram showing a food chain.

Q.

Biomagnification is highest in

1. producers

2. primary consumers

3. secondary consumers

4. decomposers

Q.

Food chains generally consist of only three or four step. Why?

1. All organisms are covered in these steps

2. Very little usable energy is left after fourth step

3. Only four trophic levels can be formed.

4. The food chain will break down

Q.

In a particular food chain, if the energy produced at first trophic level is 1000 Kcal, then the amount of energy which reaches fourth trophic level is:

1. 0.1 cal

2. 100 kcal

3. 0.01 kcal

4. 0.1 kcal

Q.

What is a food chain ?

Q. Assertion :Herbivores are also called as key industry animals because they convert plant matter into animal matter. Reason: Decomposers play a pivotal role in the ecosystem and they indirectly support the producers.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Which of these might be a consumer in a desert ecosystem?

1. Snake
2. Cactus
3. Aloe vera
4. Sand

Q. Which ecosystem has maximum number producers in an unit area

1. Pond
2. Grassland
3. Forest
4. Tundra

Q.

Draw a simple diagram showing a food chain.

Q. A rat feeding on potato tuber is

1. Producer
2. Primary consumer
3. Carnivore
4. Decomposer

Q. In an ecological pyramid, the base represents ....... level.

Q.

How much energy is available for the organisms of next trophic level?

1. 10%

2. 75%

3. 1%

4. 90%