Q 11 :    

Read the passage given below and answer the following questions from (i) to (v):

The energy flow in the ecosystem is one of the major factors that support the survival of such a great number of organisms. For almost all organisms on earth, the primary source of energy is solar energy. It is amusing to find that we receive less than 50 per cent of the sun’s effective radiation on earth. When we say effective radiation, we mean the radiation, which can be used by plants to carry out photosynthesis.

 

(i) Every food chain in the ecosystem begins with ________. Which are the original?

  • saprophytes

     

  • parasites

     

  • producers

     

  • none of these

     

(3)

 



Q 12 :    

Read the passage given below and answer the following questions from (i) to (v):

The energy flow in the ecosystem is one of the major factors that support the survival of such a great number of organisms. For almost all organisms on earth, the primary source of energy is solar energy. It is amusing to find that we receive less than 50 per cent of the sun’s effective radiation on earth. When we say effective radiation, we mean the radiation, which can be used by plants to carry out photosynthesis.

 

(ii) If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:

  • 10 J

     

  • 0.1 J

     

  • 1 J

     

  • 0.01 J

     

(3)

 



Q 13 :    

Read the passage given below and answer the following questions from (i) to (v):

The energy flow in the ecosystem is one of the major factors that support the survival of such a great number of organisms. For almost all organisms on earth, the primary source of energy is solar energy. It is amusing to find that we receive less than 50 per cent of the sun’s effective radiation on earth. When we say effective radiation, we mean the radiation, which can be used by plants to carry out photosynthesis.

 

(iii) The constituents which do not form eco-system are:

  • Biotic constituents

     

  • Plastic bags

     

  • Abiotic constituents

     

  • All of the above

     

(2)

 



Q 14 :    

Read the passage given below and answer the following questions from (i) to (v):

The energy flow in the ecosystem is one of the major factors that support the survival of such a great number of organisms. For almost all organisms on earth, the primary source of energy is solar energy. It is amusing to find that we receive less than 50 per cent of the sun’s effective radiation on earth. When we say effective radiation, we mean the radiation, which can be used by plants to carry out photosynthesis.

 

(iv) Which of the two sets belong to the same trophic level?
 

  • Frog : Lizard

     

  • Rabbit : Tiger

     

  • Vulture : Crow

     

  • Deer : Hawk

     

(1)

 



Q 15 :    

Read the passage given below and answer the following questions from (i) to (v):

The energy flow in the ecosystem is one of the major factors that support the survival of such a great number of organisms. For almost all organisms on earth, the primary source of energy is solar energy. It is amusing to find that we receive less than 50 per cent of the sun’s effective radiation on earth. When we say effective radiation, we mean the radiation, which can be used by plants to carry out photosynthesis.

 

(v) A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in:

  • plant

     

  • man

     

  • birds

     

  • fish

     

(2)

 



Q 16 :    

Refer the figure given below and answer the following questions from (i) to (v):
Energy flow and trophic levels

 

(i) How are the organisms on Block 1 level best described as:

  • primary consumers

     

  • secondary consumers

     

  • tertiary consumers

     

  • decomposers

     

(1)

 



Q 17 :    

Refer the figure given below and answer the following questions from (i) to (v):
Energy flow and trophic levels

 

(ii) In the figure given above what would be the amount of energy available at block 1 and block 2 levels if energy at producer level is 10,000 kcal?

  • 1000 kcal and 100 kcal

     

  • 100 kcal and 1000 kcal

     

  • 10,000 kcal and 100 kcal

     

  • 100 kcal and 10 kcal

     

(1)

 



Q 18 :    

Refer the figure given below and answer the following questions from (i) to (v):
Energy flow and trophic levels

 

(iii) What is represented by eagle at block 3?

  • Decomposers

     

  • Secondary consumers

     

  • Tertiary consumers

     

  • Predator

     

(3)

 



Q 19 :    

Refer the figure given below and answer the following questions from (i) to (v):
Energy flow and trophic levels

 

(iv) After solar energy enters our atmosphere, which statement does not hold good regarding subsequent events?

  • Most of the radiation is absorbed by the Earth’s surface and used to warm the surface.

     

  • Some of the solar radiation is reflected by Earth and atmosphere.

     

  • Some of the infra-red radiation is absorbed by the atmosphere and re-emitted in all directions by the green-house gases.

     

  • No infra-red radiation is emitted by Earth.

     

(4)

 



Q 20 :    

Refer the figure given below and answer the following questions from (i) to (v):
Energy flow and trophic levels

 

(v) Energy flow diagram definitely conveys all the points given below, except:

  • the flow of energy is multi-directional.

     

  • the energy captured by the autotrophs does not return to the solar input.

     

  • the energy that passes to the herbivores does not come back to the autotrophs.

     

  • the energy moves progressively through the various trophic levels and it is no longer available to the previous level.

     

(1)