Food Chain

Q.

Arrange the following in a food chain: Fish, Algae, Small animals, Big Fish

Q.

What do you understand by biomagnification? What are the substances responsible for biomagnification?

Q.

Write the characteristics of the food chain.

Q.

Write an aquatic food chain.

Q.

Differentiate between prey and predator.

Q.

What do you understand by trophic level?

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

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

Q.

Construct a food chain comprising the following: Snakes, Hawk, Rats, Plants

Q.

Give two examples of the food chain.

Q.

Consider the food chain: $Grass\to Deer\to Lion$ What will happen if all the lions are removed from the above food chain?

Q.

What will happen if deer is missing in the food chain given below? $Grass\to Deer\to Tiger\to$

(a) The population of tigers increases

(b) The population of grass decreases

(c) Tigers will start eating grass

(d) The population of tigers decreases and the population of grass increases.

Q.

In a food chain consisting of grass, frog, bird, and insects, where will the concentration of the harmful chemicals be maximum?

Q. What is 10%law? Explain with an example?

Q.

Why are there rarely more than five links (or five organisms ) in a food chain?

Q.

Explain how harmful chemicals enter our bodies.

Q.

In a food chain, the initial organism is usually :

(a) photosynthetic

(b) herbivore

(c) saprophytic

(d) parasitic.

Q. What are the functions performed by food chain?

Q.

The number of malaria patients in a village increased tremendously when a large number of frogs were exported from the village. What could be the cause for it? Explain with the help of food chain.

Q.

Which of the following in a food chain will have the maximum concentration of harmful chemicals in their body- small fish, zooplanktons, birds, phytoplankton?

Q.

Give an example of a four-step food chain operating in grassland. Name the secondary consumer in this food chain

Q.

The various steps in the food chain are called____.

1. trophic levels

2. energy levels

3. nutrition levels

4. ecosystem levels

Q.

What would happen to the number of grass plants and foxes if the number of rabbits : (a) increased? (b) decreased?

Q.

A student went to study a local pond. In one part of the pond, she noticed tadpoles scraping at some pondweed. In another part, she saw a water beetle holding a tadpole in its jaws.

(a) Construct a food chain for the pond.

(b) How many links are there in this chain?

Q.

Define the biological magnification phenomenon by taking some suitable examples.

Q.

Which category of organisms forms the starting point of a food chain?

Q.

What are the various steps of the food chain called?

Q.

Write down a food chain : (a) in the sea (b) which ends with humans (c) with five links in it.

Q.

Question 4
In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass $\to$ Grasshopper $\to$ Frog $\to$ Snake $\to$ Hawk

(a) 5 k J
(b) 50 k J
(c) 500 k J
(d) 5000 k J

Q.

The following is a food chain that starts with plants and ends with a human: $plants\to bee\to human$

(a) Explain how plants provide food for bees.

(b) How do bees provide food for humans?

(c) How does this food chain differ from a usual food chain involving human such as $plants\to goat\to human$?

(d) Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.

Q. percent of Sun's energy is actually fixed by plants.

1. 1-3
2. 10-15
3. 30-35