Food Web

Q.

(a) What is a food chain? Give one example of a simple food chain.

(b) What is a food web? Show its formation.

Q.

Explain biological magnification?

Q.

Explain the concept of food web with a diagram. [5 MARKS]

Q. Food webs consist of many interconnected food chains and a realistic representation of feeding relationships in ecosystems.

1. False
2. True

Q.

A food web is formed by

1. interconnections of different ecosystems

2. interconnections of different food chains

3. interconnections of different species

4. interconnections of nutrient cycles.

Q. In a grazing food chain, grass is at trophic level.

1. T1
2. T2
3. T3
4. T4

Q.

Name two predators of snakes in a food web operating in a forest ecosystem.

Q.

The advantage of a food web is that even if one organism is removed, the food web is not affected.

1. True
2. False

Q. Food webs consist of many interconnected food chains and a realistic representation of feeding relationships in ecosystems.

1. False
2. True

Q. Food webs consist of many interconnected food chains and a realistic representation of feeding relationships in ecosystems.

1. False
2. True

Q. Food webs consist of many interconnected food chains and a realistic representation of feeding relationships in ecosystems.

1. True
2. False

Q. Consumers can use only 10% of energy that they have obtained.

1. True
2. False

Q. Food webs consist of many interconnected food chains and a realistic representation of feeding relationships in ecosystems.

1. False
2. True

Q. What will happen if deer gets extinct in the food chain given below?
Grass $\to$ Deer $\to$ Tiger

1. The tiger will start eating grass.
2. The population of tiger increases.
3. The population of grass decreases.
4. The population of tiger decreases and the population of grass increases.

Q. If one part of food web goes inactive, the whole food web will be inactive soon.

1. False

2. True

Q. The hierarchies within a food web are called _______ levels.

Q.

A food web is formed by:

1. Interconnections of different food chains.

2. Interconnections of different species.

3. Interconnections of nutrient cycles.

4. Interconnections of different ecosystems.

Q.
In the above food web, if wild cat becomes extinct, then which population would increase the most?

1. Deer
2. Fox
3. Vegetation
4. Mouse

Q. In the early days, the humans use to control the population by the means of the following?

1. Infanticide.
2. Abandonment.
3. Murders.
4. All of the above.

Q.

Molecule X is both an alkene and a carboxylic acid. Which row describes X?

1. 

2. 

3. 

4. 

Q. An example of a producer in the aquatic food web would be

1. Fish
2. Duckweed
3. Ducks
4. Insects

Q.

Give an example of a food web.

Q. A food web is formed by the interconnection of different ____.

1. ecosystems
2. food chains
3. species
4. nutrient cycles

Q.

Question 15
Which group of organisms are not constituents of a food chain?
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish, grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle, grass, grasshopper

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) and (iii)
(d) (i) and (iv)

Q. Without the __________ in a food web, many chemicals would not be recycled.

Q. Choose the incorrect statement from the following.

1. Decomposers help in recycling the nutrients.
2. Green plants make their food from organic compounds.
3. Producers prepare their own food from inorganic compounds.
4. Plants convert solar energy into chemical energy.
   

Q. Food webs consist of many interconnected food chains and a realistic representation of feeding relationships in ecosystems.

1. False
2. True

Q. Observe the following food chain:
$Grassplants\to Rabbits\to Foxes$
What would happen to the number of grass plants and foxes, if the number of rabbits:
(a) increased? [1 Mark]
(b) decreased? [1 Mark]