Food Web

Q.

Why are green plants called producers?

Q. The driving force of ecosystem is .

1. solar energy
2. wind energy
3. thermal energy

Q.

How is the food web important in the ecosystem?

Q.

The honey bee produces honey. In terms of food chain , is the honey bee a producer or consumer ?

Q. The population size of consumers may increase if secondary consumers do not feed on them.

Q.

Name the process by which producers make their food.

Q. Mass of living matter at a trophic level in an area at any time is called :

1. Standing crop
2. Standing state
3. Detritus
4. Humus

Q. Stability of ecosystem depends upon

1. Primary productivity
2. Number of producers
3. Number of consumers
4. Interaction between producers and consumers

Q.

With the help of a line diagram, show a simple food chain in a grassland.

Q. Approximately what percentage of solar energy is available for photosynthesis?

1. 10%
2. 50%
3. 25%
4. 99%

Q. Organisms which convert dead and decaying organisms into simpler compounds are called

1. herbivores
2. detritivores
3. carnivores

Q. What is bio magnification

Q.

Grass, fish and goat make a food chain.

1. True

2. False

Q.

Question 16
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

(a) 1 %
(b) 5 %
(c) 8 %
(d) 10 %

Q. Observe the following food chain.

Ice algae $\to$ Zooplankton $\to$Arctic cod fish$\to$ Seals$\to$ Polar bear

What will happen if ice melts and the ice algae population drops down?

1. Arctic cod fish population will decrease
2. Seal population will increase
3. Polar bear population will increase
4. Polar bear population will decrease

Q. What does the following picture represent?

1. Food chain
2. Population
3. Food web
4. Ecosystem

Q. A food chain in an ecosystem represents the ___ .

1. feeding relationship
2. energy flow
3. ecological succession
4. (a) and (b) above

Q. Which of the following is not a producer?

1. Tiger
2. Lotus
3. Water Lily
4. Algae

Q. The word "trophic" is derived from the word "trophos" which means .

1. feeder
2. level
3. chain

Q.

Which of the following statement is incorrect?

1. All green plants and blue-green algae are producers.

2. Green plants get their food from organic compounds.

3. Producers prepare their own food from inorganic compounds.

4. Plants convert solar energy into chemical energy.

Q. Difference between food chain and food web.

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:

1. Interconnections of different ecosystems
2. Interconnections of different food chains
3. Interconnections of different species
4. Interconnections of nutrient cycles

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

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

Q. What will be the direction of energy flow if a grasshopper is eaten by a frog?

1. Producer to decomposer
2. Primary consumer to secondary consumer
3. Secondary consumer to primary consumer
4. Producer to primary consumer

Q. What is food chain and food web

Q. High infant mortality and maternal mortality rates have contributed to population explosion.

1. False
2. True

Q. Which of the following constitutes a food chain?

1. Grass, Wheat and Mango
2. Grass, Fish and Goat
3. Grass, Goat and Human
4. Goat, Cow and Elephant

Q. In the ecological study of food interactions, what are autotrophic organisms called?

Q. Choose the correct option with respect to statements X and Y.

X: Marine ecosystems have lesser trophic levels than terrestrial ecosystems.

Y: Most of the phytoplankton is available for consumption and assimilation by primary consumers in aquatic ecosystems.

1. Both X and Y are true
2. Both X and Y are false
3. X is true and Y is false
4. X is false and Y is true