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What Would Happen to the Number of Rabbits and Grass Plants If the Number of Foxes Decreased? - Science

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प्रश्न

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

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उत्तर

If the number of foxes decreases, then there will be fewer foxes to consume rabbits as food, so the number of rabbits will increase, which will in turn lead to rabbits consuming more grass plants as food. Hence, grass plants will become sparser.

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पाठ 5: Our Environment - Exercise 1 [पृष्ठ २३०]

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लखमीर सिंह Biology (Science) [English] Class 10
पाठ 5 Our Environment
Exercise 1 | Q 78.2 | पृष्ठ २३०

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

List two important roles play in the environment by decomposers.


What will happen if we kill all the organisms in one trophic level?


In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?

Plants → Rats → Snakes → Hawks
 


The following statement is true or false :
 In biology, human beings are called producers.


What is the role of decomposers in the ecosystem?


Write down a food chain which ends with humans.


Write one or two word for the following statement/definition :

Organisms which depend on the producers for food either directly or indirectly


Organisms of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the ______.


The following is a food chain that ends with human :

Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.


Some hunters are roaming in the plush green forest of Africa. They spot a deer and kill it. They decide to roast the deer there and then and eat it. When the hunters had just finished enjoying the feast of roasted deer, a lion attacks them. The lion kills one of the hunters and eats his flesh.
(a) write a food chain which provides food to lion in this case.
(b) Which animal (other than deer) the lion could look for food if he did not get the hunter as prey?
(c) Which other animal in the forest could have been in place of lion?
(d) How does the above food chain differ form the food chain such as : plants → goat → man?


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


Fill in the following blank with suitable word :

Pesticides enter the food chain at the ...........level


Explain how harmful chemicals enter our bodies.


Which common pesticide has accumulated in human body in considerable amounts?


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


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: 
    1. Food web
    2. Trophic level
    3. Ecosystem
    4. Biomagnification  (1)
  4. With regard to various food chains operating in an ecosystem, man is a:
    1. Consumer
    2. Producer
    3. Producer and consumer
    4. Producer and decomposer  (1)

If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be ______.


The food chain begins with the energy given by the ______.


Define – Heterotrophs.


Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement. 


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