Food Chain

Q.

Question 23
Write the common food chain of a pond ecosystem.

Q.

Complete the following food chain by writing the names of appropriate organisms in the blanks.

(i) Grass $\to$ ................. $\to$ Snake $\to$ .............

(ii) ............... $\to$ Mouse ..............$\to$ Peacock

Q.

Given below is the representation of a certain phenomenon in nature. with four organisms 1-4.

(a) Name the phenomenon represented.

(b) Name any one organism that could be shown at No. 5.

(c) Name the biological process which was the starting point of the whole chain.

(d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. 1 for their survival.

Q. The average efficiency of energy transfer from herbivores to carnivores is 10%.

1. 10%
2. 5%

Q. One of the following is not a consumer. This one is:​

1. algae​
2. antelope
3. alligator​
4. giraffe

Q. Identify the possible link "A" in the following food chain :
Plant $\to$ insect $\to$ frog $\to$ "A" $\to$ Eagle

1. Cobra
2. Parrot
3. Rabbit
4. Wolf

Q. what is the source of oxygen released in photosynthesis-water or carbon dioxide

Q.

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

1. True

2. False

Q. Loss of energy in a food web is n times the loss of energy in a food chain, i.e. loss of energy in a food web is more than that in a food chain.

Q. If frog is the prey, what could be the predator?

1. Grass
2. Insect
3. Snail
4. Snake

Q.

Question 2
Which of the following constitute a food-chain?
1. Grass, wheat and mango
2. Grass, goat and human
3. Goat, cow and elephant
4. Grass, fish and goat

Q. Sparrow campaign was started to kill sparrow because

1. It harms the crops
2. It harms pests
3. It causes disease
4. None of the above

Q. Greenhouse gases include____

1. Carbondioxide $\left(C{O}_2\right)$
2. Methane $\left(C{H}_4\right)$
3. Water vapour
4. All of the above

Q.

Biological magnification is highest in food consumed by:

1. Reptiles

2. Humans

3. Birds

4. Wild animals

Q. Which of the following limits the number of trophic levels in a food chain?

1. Loss of energy at each trophic level
2. Deficient food supply at each trophic level
3. Supply of polluted air and water
4. Spread of diseases among organisms

Q.

Which statement describes the fact that pesticides 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.

Which part of a food chain is affected by one animal becoming extinct?

1. The whole food chain is affected.

2. Only animals at the top of the food chain are affected.

3. Only plants and animals at the bottom of the food chain are affected.

4. Producers and decomposers are affected.

Q. Sparrow campaign was started in

1. 1960
2. 1958
3. 1970
4. 1978

Q. In a food chain, the third trophic level is always occupied by:

1. carnivores
2. producers
3. decomposers
4. herbivores

Q. Which of the following creatures would be considered as a topmost predator?

1. Tiger
2. Fox
3. Snake
4. Antelope

Q. If all producers perish, then _____.

1. only carnivores will survive
2. only omnivores will survive
3. all animals will die
4. only herbivores will die

Q. Food chains begin with __________.

1. predators
2. consumers
3. producers
4. decomposers

Q. What is a food chain?

Q.

Complete the trophic levels in the following basic food chain.

Producers $\to$ ? $\to$ Secondary consumers $\to$ ? $\to$ Decomposers

1. Carnivores; herbivores

2. Primary consumers; tertiary consumers

3. Tertiary consumers; primary consumers

4. Insectivores; carnivores

Q. The highest DDT concentration in aquatic food chain shall occur in

1. Crab
2. Eel
3. Phytoplankton
4. Seagull

Q. Food chains begin with __________.

1. producers
2. consumers
3. predators
4. decomposers

Q. What was the aim of sparrow campaign?

1. To kill all the birds
2. To protect all the birds
3. To kill sparrow
4. To protect sparrow