Food Web

Q.

Which one of the following is not a limitation of ecological pyramids?

1. Saprophytes are not given any place in ecological pyramids even though they play a vital role in the ecosystem

2. It accommodates a food web

3. It assumes a simple food chain

4. All are limitations of ecological pyramids

Q.

In a food chain the herbivores are represented by.

1. Producers.

2. Primary consumers.

3. Secondary consumers.

4. Decomposers.

Q.

__(Food pyramids/Food webs) is a figure or shape that has a large base, which continues narrowing at each next level upwards, finally ending as a small point.

Q. State Whether True or False.
The flow of nutrients in an ecosystem is cyclic.

1. True
2. False

Q.

Inter-connected food chains are called __ (Food pyramids/Food webs).

Q.

In the given food chain, if grass disappears, what would be its immediate consequence?

1. The population of lion would dwindle

2. The population of deer would increase

3. The population of deer would increase

4. The population of deer would dwindle

Q.

Question 17
In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?


(a) T4
(b) T2
(c) T1
(d) T3

Q. Choose the correct option for the characteristics of an ecosystem. You may choose more than one option.

1. Unidirectional flow of energy
2. Nutrient cycling
3. Food Chain
4. Niche

Q.

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

1. Duckweed

2. Ducks

3. Fish

4. Insects

Q.

If one part of food web becomes inactive, the whole food web will be inactive soon. State true or false.

1. True

2. False

Q. Trophic level is the _____.

1. Stage in a food chain
2. Stage in an ecological niche
3. Axis around earth
4. Energy level in a food web

Q.

Which of the following constitute a food chain?

1. plant, apple, butterfly, man

2. grass, spider, bee, buffalo

3. plant, insect, toad, snake

4. algae, insect larvae, fish, cow

Q.

Bamboo trees (species of evergreen coniferous trees) growing in a forest belong to which trophic level?

1. first trophic level (T1)

2. second trophic level (T2)

3. third trophic level (T3)

4. fourth trophic level (T4)

Q. Give reasons:
Sun is the source of energy in DFC.
DFC is major conduit of energy in aquatic ecosystem.

Q.

The hierarchies within a food web are called _______________ levels.

Q.

In the given food web, if wild cat population becomes extinct, then _______ population would increase.

1. Tiger

2. Mouse

3. Rabbit

4. Vegetation

Q. Write short notes on any two of the following.
(a) Ecological pyramid
(b) Food web and food chain
(c) Biological or Biochemical Oxygen Demand (BOD)

Q.

What kind of interaction does the given picture represent?

1. Food web

2. Hydrologic cycle

3. Food chain

4. Food cycle

Q. A partial food web is shown here :
Which of the following changes is most likely to occur if the sparrow population decreases?

1. The fox population increases.
2. The hawk population increases.
3. The grasshopper population competes less with the praying mantis.
4. The hawk population and the fox population prey more heavily on rabbit.

Q. Identify the likely organisms (I), (II), (III), and (IV) in the food web

1. I - Deer, II - Rabbit, III - Frog, IV - Mouse
2. I - Dog, II - Squirrel, III - Bat, IV - Deer
3. I - Rat, II - Dog, III - Tortoise, IV - Crow
4. I - Squirrel, II - Cat, III - Rat, IV - Pigeon

Q. Food web usually exists in ecosystem which

1. Is based on order of preference
2. Consists of several interconnected food chain
3. May include organism occupying different tropic levels
4. More than one option is correct

Q. With respect to the given image, identify I and II.

1. I - Deer , II - Tiger
2. I - Grasshopper , II - Elephant
3. I - Cow , II - Lion
4. I - Jackal , II - Cow

Q. Did fire make human beings the most powerful creature in the food web?

1. True
2. False

Q. The ultimate source of our energy is

1. Sun
2. Electricity
3. Wind
4. Plants

Q. In a grazing food chain

1. Primary consumers eat photosynthetic organisms
2. Secondary consumers eat photosynthetic organisms
3. Primary consumers eat detritus
4. Secondary consumers eat detritus

Q. Which of the following processes does not effect the nutrient flow in an ecosystem?

1. Migration
2. Parasitism
3. Predation
4. Production

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

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

Q. Which is not true about a complex food web?

1. Populations tend to remain about the same size
2. Energy levels remain about the same for all trophic levels
3. Inputs are constant and outputs are minimal except for heat
4. Most of the energy entering the system maintains the whole community

Q. Networking of different food chains in an ecosystem provides

1. Stability
2. Instability
3. Origin of new species
4. None of the above