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With reference to food chains in ecosystems, consider the following statements :  
1. A food chain illustrates the order in which a chain of organisms feed upon each other.
2. Food chains are found within the population of a species.
3. A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statements given above is/are correct? 
  • a)
    1 only
  • b)
    1 and 2 only
  • c)
    1, 2 and 3
  • d)
    None
Correct answer is option 'A'. Can you explain this answer?
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With reference to food chains in ecosystems, consider the following st...
A food chain is the sequence of who eats whom in a biological community (an ecosystem) to obtain nutrition.
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With reference to food chains in ecosystems, consider the following st...
Explanation:

Food chains are an important part of ecosystems and help us understand the relationships between different organisms in an ecosystem. Let's look at each statement and see if it's correct:

1. A food chain illustrates the order in which a chain of organisms feed upon each other.

This statement is correct. A food chain shows the flow of energy from one organism to another. For example, a simple food chain in a grassland ecosystem could be: grass → grasshopper → frog → snake → hawk. The grass is eaten by the grasshopper, which is then eaten by the frog, and so on. The order of the organisms in this chain shows the flow of energy from one organism to another.

2. Food chains are found within the population of a species.

This statement is incorrect. Food chains involve multiple species in an ecosystem, not just one population. In fact, food chains can be interconnected and form a food web that shows the relationships between many different species in an ecosystem.

3. A food chain illustrates the numbers of each organism which are eaten by others.

This statement is incorrect. A food chain shows the order in which organisms are eaten, but it doesn't necessarily give information about the numbers of each organism. For example, a food chain might show that a bird eats ten insects, but it doesn't tell us how many insects are in the population overall.

So, the correct answer is option 'A' - only statement 1 is correct.
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Directions for the following 6 (six) items:Read each of the following two passages and answer the items that follow. Your answers to these items should be based on the passages only.Passage-1Ecosystems provide people with a variety of goods and services; food, clean water, clean air, flood control, soil stabilization, pollination, climate regulation, spiritual fulfilment and aesthetic enjoyment, to name just a few. Most of these benefits either are irreplaceable or the technology necessary to replace them is prohibitively expensive. For example, potable fresh water can be provided by desalinating sea-water, but only at great cost. The rapidly expanding human population has greatly modified the Earths ecosystems to meet their increased requirements of some of the goods and services, particularly food, fresh water, timber, fibre and fuel. These modifications have contributed substantially to human well being and economic development. The benefits have notbeen equally distributed. Some people have actually been harmed by these changes. Moreover, short-term increases in some ecosystem goods and services have come at the cost of the long-term degradation of others. For example, efforts to increase the production of food and fibre have decreased the ability of some ecosystems to provide clean water, regulate flooding and support biodiversity.Q. With reference to the passage, consider the following statements. Expanding humans population has an adverse effect on:1. Spiritual fulfilment 2. Aesthetic enjoyment 3. Potable fresh water 4. Production of food and fibre 5. BiodiversityWhich of the statements given above are correct ?

Ecosystems provide people with a variety of goods and services; food, clean water, clean air, flood control, soil stabilization, pollination, climate regulation, spiritual fulfilment and aesthetic enjoyment, to name just a few. Most of these benefits either are irreplaceable or the technology necessary to replace them is prohibitively expensive. For example, potable fresh water can be provided by desalinating sea-water, but only at great cost. The rapidly expanding human population has greatly modified the Earths ecosystems to meet their increased requirements of some of the goods and services, particularly food, fresh water, timber, fibre and fuel. These modifications have contributed substantially to human well being and economic development. The benefits have notbeen equally distributed. Some people have actually been harmed by these changes. Moreover, short-term increases in some ecosystem goods and services have come at the cost of the long-term degradation of others. For example, efforts to increase the production of food and fibre have decreased the ability of some ecosystems to provide clean water, regulate flooding and support biodiversity.Q. With reference to the passage, consider the following statements:1. It is imperative to modify the Earths ecosystems for the well being of mankind. 2. Technology can never replace all the goods and services provided by ecosystems. Which of the statements given above is/are correct ?

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With reference to food chains in ecosystems, consider the following statements : 1. A food chain illustrates the order in which a chain of organisms feed upon each other.2. Food chains are found within the population of a species.3. A food chain illustrates the numbers of each organism which are eaten by others.Which of the statements given above is/are correct?a)1 onlyb)1 and 2 onlyc)1, 2 and 3d)NoneCorrect answer is option 'A'. Can you explain this answer?
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