Ecosystem

Q.

How do the biotic and abiotic components of an ecosystem interact?

Q.

What happens when an organism is removed from a food chain?

Q.

How are detritivores different from decomposers?

Q.

What are rare species?

Q.

In relation to Gross primary productivity and Net primary productivity of an ecosystem. Which one of the following statements is correct

1. Gross primary productivity and Net primary productivity are one and same.

2. There is no relationship between Gross primary productivity and Net primary

   productivity

3. Gross primary productivity is always less than Net primary productivity.

4. Gross primary productivity is always more than Net primary productivity.

   
   

Q.

Write about biotic and abiotic components of forest ecosystem.

Q.

Construct a forest food chain?

Q.

Which among the following is a group of abiotic factors?

1. Sunlight, plants, fungi and virus

2. Sunlight, plants, animals and water

3. Sunlight, temperature, water and soil

4. Plants, animals, bacteria and fungi

Q. Which of the following statement is correct with respect to manure?

1. Manure is manufactured in factories.
2. Manure is made of inorganic salts.
3. Manure adds humus to the soil.
4. Manure causes water pollution.

Q.

What is an example of a micro-ecosystem?

Q.

Oceans cover approximately __________ of the earth’s surface.

1. 90%

2. 70%

3. 100%

4. 30%

Q.

Where is Chilka lake located?

Q.

Which is not a natural ecosystem?

1. Desert

2. Aquarium

3. Forest

Q.

Which one of the following processes during decomposition is correctly described?

1. Leaching - water-soluble inorganic nutrients rise to the top layers of soil

2. Catabolism - last step in the decomposition under fully anaerobic conditions

3. Humification - leads to the accumulation of dark-colored substance humus Which undergoes microbial action at a very fast rate.

4. Fragmentation- carried out by organisms such as earthworms

Q.

What is ecological interaction? Give examples of ecological interaction.

Q.

Life cannot originate from inorganic materials at present because of:

1. High degree of environmental pollution

2. A very high amount of oxygen in the atmosphere

3. Very high atmospheric temperature

4. Absence of raw material

Q.

Give reasons why:

1. The forest ecosystem is more stable than the cropland ecosystem.
2. Available energy goes on decreasing at each trophic level in a food chain.

Q.

An artificial ecosystem is-

1. Lake

2. Ocean

3. Aquarium

4. Forest

Q.

What waste do fish produce?

Q. What is the basic similarity among all the living organisms (plants and animals) ?

Q.

What is the unidirectional flow of energy?

Q.

Name the primary source of energy in the ecosystem.

Q.

Which of the following food chains directly depend on solar radiation?

1. Grazing

2. Detritus

3. Predator

4. All of these

Q.

Suggest one word for each of the following statements/ definitions.

(a) The physical and biological world where we live in.

(b) Each level of the food chain where the transfer of energy takes place.

(c) The physical factors like temperature, rainfall, wind, and soil of an ecosystem.

(d) Organisms that depend on the producers either directly or indirectly for food.

Q. Choose the primary consumer in an aquatic ecosystem?

1. Snail
2. Pistia
3. Hydrilla
4. Crocodile

Q.

An _____ includes living things in a given area, interacting with each other, and with the abiotic factors.

1. Population

2. Ecospace

3. Ecosystem

4. Community

Q.

What are energy transfers?

Q. Which among the following is/are physical abiotic factor/s in an ecosystem?

1. Air
2. Nitrogen
3. Carbohydrate
4. Soil

Q.

The biotic components of ecosystems are

1. Producers

2. Carnivores

3. Herbivores

4. All of these

Q.

Name one organism for secondary consumer.