Food Chain

Q.

What is the direction of flow of energy in an ecosystem?

Q.

How many types of consumers are there? Define them with one example each.

Q.

Which of the following is a primary consumer?

1. Herbivore

2. Carnivore

3. Scavenger

4. Saprophyte

Q.

What are consumers? Give their classification.

Q.

Which one is a correct food chain?

1. Eagle $\to$ Snake $\to$ Grass hopper $\to$ Grass $\to$ Frog

2. Frog $\to$ Snake $\to$ Eagle $\to$ Grasshopper $\to$ Grass

3. Grasshopper $\to$ Grass $\to$ Snake $\to$ Frog $\to$ Eagle

4. Grass $\to$ Grasshopper $\to$ Frog $\to$ Snake $\to$ Eagle

Q. Which part of the given food chain is affected by the extinction of frog?

Grass $\to$ Grasshopper $\to$ Frog $\to$ Snake $\to$ Eagle

1. The whole food chain is affected.
2. Only eagles and snakes are affected.
3. Only snakes are affected.
4. Only producers and decomposers are affected

Q. Choose the correct option with respect to food chain.

1. Provides more energy for next trophic level.
2. Provides food for succeeding organisms.
3. Consumes energy from next trophic level.
4. Do not pass energy to next trophic level.

Q. What role do humans play in a food chain?

Q.

Peacock can be a good example of trophic level ______.

Plants → Rat → Snake → Peacock
(Producer) (Consumer primary) (Consumer secondary) (Consumer tertiary)

1. Trophic level 1

2. Trophic level 2

3. Trophic level 3

4. Trophic level 4

Q. Each organism in a food web represents a:

1. Food chain
2. Trophic level
3. Apex predator
4. Energy pyramid

Q.

The ___ make up the trophic level of food chain having the greatest amount of energy.

1. Autotrophs

2. Carnivores

3. Decomposers

4. Predators

Q. Which of the following does the pyramid of numbers indicate?

1. Species belonging to a particular region
2. Number of animals in a biotic community
3. None of the above
4. Number of individuals at every trophic level

Q.

Question 4
What will happen if we kill all the organisms in one trophic level?

Q.

Which of the following is a correct reason for the assertion that "pesticides are said to move up the food chain”?

1. Pesticides has a greater effect on larger animals than on insects.

2. Top predators often accumulate the pesticides contained in the bodies of their prey.

3. Birds and predatory mammals are not affected by pesticides.

4. Pesticides kill insects and other target pests before they can absorb the poison.

Q. (a)Why do food chains in an ecosystem do not have more than 4 to 5 trophic levels?
(b)How much energy flows from one trophic level to the next in a food chain?

Q. In the following food chain, grass provides $4000$j of energy to the grasshopper. How much energy will be available to snakes and frogs? Grass, Grasshopper, Frogs, Snakes

Q. Birds feed on insects. Which of the following terms correctly define birds?

1. herbivore, decomposer
2. carnivore, consumer
3. producer, heterotroph
4. autotroph, herbivore

Q.

The concentration of chemical food contaminants is higher in birds of prey than in many of the individual organisms that they eat. Which of the following statement(s) best explain the reason for the higher concentration of food contaminants in birds of prey?

1. Birds of prey store more of the food they eat.

2. Birds of prey catch animals with chemical contaminants more easily.

3. Only birds of prey store chemical contaminants.

4. Chemical contaminants are stored and magnified in organisms to higher up the food chain.

Q.

Hawk, Eagle and Vulture belong to which category of animals?

1. Producers

2. Decomposers

3. Carnivores

4. Omnivores

Q. Identify X, Y and Z with respect to freshwater ecosystem.
$\begin{array}{c}\text{X}\\ \text{Annelids}\\ \text{Snails}\end{array}\begin{array}{c}\text{Y}\\ \text{Small fishes}\\ \text{Frogs}\end{array}\begin{array}{c}\text{Z}\\ \text{Large fishes}\\ \text{Crocodiles}\end{array}$

1. X - Primary consumer
   Y - Secondary consumer
   Z - Tertiary consumer
2. X - Secondary consumer
   Y - Primary consumer
   Z - Tertiary consumer
3. X - Primary consumer
   Y - Producers
   Z - Decomposers
4. X - Decomposers
   Y - Producers
   Z - Primary consumer

Q. Rabbits feed on grass and other plants. They are:

1. Producers
2. Decomposers
3. Herbivores
4. Carnivores

Q. Flow of energy in an ecosystem is always ______.

1. multidirectional
2. parallel
3. bidirectional
4. unidirectional

Q.

Grass, fish and goat is an example for a food chain.

1. True

2. False

Q. Question 34
Give two differences between food chain and food web.

Q.

Define Trophic level

Q. Which of the following is a correct food chain?

1. Eagle $\to$ Snake $\to$ Grass hopper $\to$ Grass $\to$ Frog
2. Frog $\to$ Snake $\to$ Eagle $\to$ Grasshopper $\to$ Grass
3. Grasshopper $\to$ Grass $\to$ Snake $\to$ Frog $\to$ Eagle
4. Grass $\to$ Grasshopper $\to$ Frog $\to$ Snake $\to$ Eagle

Q. Who according to the author is worse than an animal?

1. A person who works hard.
2. A person who does no work.
3. A person who does great things.
4. A person who only eats and sleeps, that too, with the help of some other persons.

Q. Flow of energy in an ecosystem is always -----------