3rd Class Science Animals Flow of Energy from One to Another

Flow of Energy from One to Another

Category : 3rd Class

*    Flow of Energy from One to Another

 

It is a chain of various organism which represents who is eaten by whom. In this chain one organism eats another organism and in return eaten by other organism. It depicts the flow of energy from one level to another. Plants are first member of the chain because they produce food and hence called producer. Herbivores like deer, grasshopper eat plants and are called primary consumer. Carnivores like snake lion, tiger eat herbivores, hence they are called as secondary consumer.

 

Look at the following picture of flow of energy from plants to animal and animals to animals:

                                               

         Producer                                                        Primary consumer                                  Secondary consumer  

 

 

 

Plants prepare food in the presence of sunlight. We can say that sunlight is the ultimate source of energy. This shows the energy flow from one level to another. In the above food chain, plant is not only eaten by goat but also by humans. Goat is not only eaten by tiger but by humans also. Human can eat both plants and animals. One organisms can be eaten by more than one organisms. This type of network of different food chains are called food web.

 

 

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    One animal can be eaten by more than one animal. The above statement is:

(a) True

(b) False

(c) Partially true

(d) Partially false

(e) None of these

 

Answer: (a)

Explanation

It is not necessary that plants can be eaten by cattle's only but human beings can also eat plant. Similarly goat is not only eaten by tigers and lions but also by human beings. This type of network of many food chains are called as food web. Therefore, option (a) is correct and rest of the options is incorrect.

   

 

   Which one of the given organisms in the food chain represents the primary consumer?

                                         

 

(a) Plant

(b) Rat

(c) Snake

(d) All of these (e) None of these  

 

Answer: (b)

Explanation

Plant is called producer, rat is primary consumer and snake is secondary consumer. Therefore, option (b) is correct and rest of the options is incorrect.

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