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In a food chain, the third trophic level is always occupied by - Science

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प्रश्न

In a food chain, the third trophic level is always occupied by

विकल्प

  • carnivores

  • herbivores

  • decomposers

  • decomposers

MCQ
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उत्तर

carnivores

Explanation -

A food chains always starts with plants or producers so they occupy the first trophic level. The plants in turn, are consumed by herbivores which occupy the second trophic level. Primary carnivores eat the herbivores and occupy third trophic level.

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अध्याय 15: Our Environment - Multiple Choice Questions [पृष्ठ १०६]

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एनसीईआरटी एक्झांप्लर Science [English] Class 10
अध्याय 15 Our Environment
Multiple Choice Questions | Q 2. | पृष्ठ १०६

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

List two main components of ecosystem?


What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?


Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat

 

Draw the food chain with four trophic levels.


Construct a long food chain.


If a grasshopper is eaten by a frog, then the energy transfer will be from ______.


What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger


Which of the following group of organisms are not constituents of a food chain?

  1. grass, lion, rabbit, wolf
  2. plankton, man, fish, grasshopper
  3. wolf, grass, snake, tiger
  4. frog, snake, eagle, grass, grasshopper

A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y

Name the organism which Y could be.


What would happen to the number of grass plants and foxes if the number of rabbits increased?


Fill in the following blank with suitable word :

 Grass → ........... → Human


Consider the following food chain

(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice →Hawks
If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.:


Calculate the amount of energy that will be available to big fish in the following food chain, if 10,000 J of energy is available to small algae from the sun :
Small algae → Zooplankton → Fish → Big fish


The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid


Human body is made up of five important components, of which water is the main component. Food, as well as potable water, are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradables, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.

  1. Why is the maximum concentration of pesticides found in human beings?  (1)
  2. Give one method which could be applied to reduce our intake of pesticides through food to some extent.  (1)
  3. Various steps in a food chain represent: 
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    2. Trophic level
    3. Ecosystem
    4. Biomagnification  (1)
  4. With regard to various food chains operating in an ecosystem, man is a:
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    2. Producer
    3. Producer and consumer
    4. Producer and decomposer  (1)

Give some examples for Biodegradable and Non-biodegradable waste.

S. No. Biodegradable waste Non-biodegradable waste
1. Food Waste Plastic Bottles
2.    
3.    
4.    
5.    

Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.


______ obtained energy from the chemical breakdown of dead organisms.


In the following food chain, vertical arrows indicate the energy lost to the environment and horizontal arrows indicate energy transferred to the next trophic level. Which one of the three vertical arrows (A, C and E) and which one of the two horizontal arrows (B and D) will represent more energy transfer? Give reason for your answer.

A food chain in a forest ecosystem


Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions:

  1. Name the type of ecosystems that exist in food chains (b) and (c).
  2. The first trophic level in all food chains is producers. Why? What percentage of solar energy do these producers capture for their use?
  3. Why are the arrows shown in the diagram in one direction only and not vice versa? Justify.

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