Trophic Levels

Q.

Write about the economic importance of earthworms.

Q.

Which of the following represents a possible food chain in a pound :

$\begin{array}{ccc}\text{Primary}& \text{Primary}& \text{Secondary}\\ \text{Producers}& \text{consumers}& \text{consumers}\\ \text{(a) green algae}& \text{fish}& \text{mosquito larvae}\\ \text{(b) fish}& \text{green algae}& \text{mosquito larvae}\\ \text{(c) mosquito larvae}& \text{fish}& \text{green algae}\\ \text{(d) green algae}& \text{mosquito larvae}& \text{fish}\end{array}$

Q.

Why are plants called producers?

Q.

Explain the terms producer and consumer. Give two examples of producers and two of consumers.

Q.

Wild animals like tigers, wolves, lions, and leopards do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation?

Q.

Show with the help of a sketch that plants are the ultimate source of food.

Q.

What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.

Q.

Describe different trophic levels in an ecosystem.

Q.

Define primary consumers.

Q.

In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :

(a) insect (b) snake (c) frog (d) grass

Q.

Which kinds of organisms are primary consumers? Give two examples of primary consumers.

Q.

A food chain consists of fish, larvae, phytoplankton and birds. The level of pesticides in water in which the fish, larva and phytoplanktons live is quite high.

(a) In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?

(b) Which organism will have the maximum amount of pesticides accumulated through the food chain?

(c) Write the food chain comprising all the organisms mentioned above.

(d) Which other organisms you could write in place of a bird in the above food chain?

Q.

Which organisms belong to third and fourth trophic levels in the food chain comprising the following? Rats, Plants, Hawk, Snakes

Q.

Which of the following is not a producer?

(a) grass (b) zooplankton (c) phytoplank ton (d) paddy

Q.

Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.

Q.

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

(a) giraffe

(b) antelope

(c) algae

(d) alligator

Q.

What are planktons?

Q.

(a) Define the trophic level. Draw the food chain with four trophic levels.

(b) What will happen if we kill all the organisms in one trophic level?

Q.

Which of the following belong to the same trophic level? Tree; Frog; Snake; Grass; Lizard

Q.

What is meant by bioconcentration of pesticides? Which common pesticide has accumulated in the human body in considerable amounts?

Q.

Construct a terrestrial food chain comprising four trophic levels.

Q. What is grass considered as ultimate constituent of flesh of animals including men?

Q.

What are biotic and abiotic factors? Explain with examples. [5 MARKS]

Q.

What is meant by biological magnification? With the help of a food chain, explain how biological magnification of harmful chemicals can occur.

Q.

What would be a better option to end the earth?

1. fire

2. ice

3. both are equally competent

4. none

Q. With reference to the given image of a simple food chain, mouse occupies which trophic level?

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

Q.

Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following: Frogs, Plants, Snakes, Hawk, Insects

Q.

What is the difference between the food habits of organisms belonging to the first and the third trophic levels? Give one example each of the organisms belonging to these two trophic levels.

Q.

State the function of decomposers in an ecosystem?

Q.

Where do humans fit on a food web?