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Read the following passage and answer the questions that follow. Your answers must be based on the passage only.

When an ecosystem is stable and healthy, we call it “Sustainable”. This means that it is capable of sustaining itself and reproducing. Sustainable ecosystems have biodiversity. There’s a variety of species and organisms living there and contributing to it.

Ecosystem destruction is already happening in the world today. 25% of our coral reefs have disappeared and it is expected that 60% more will be gone in 30 years. This is due to ocean acidification, water pollution and illegal fishing. If all the corals go, what will happen to our marine life? Deforestation is caused by illegal logging for human need and progress. More than 4.6 million hectares of forest have been burned or cut down. How many species have become extinct due to this? How many homes have been destroyed?

Habitat loss is endangering our animal species. Even our apex predators are being affected – the lion, tiger, polar bear and even the majestic mountain gorillas are all being threatened by habitat loss. Humans destroy ecosystems. Our lifestyle creates pollution and we overuse our natural resources. Today, we are using the resources of 1 and ½ planet Earths, even though we only have one. We build roads, hunt animals, cut down trees destroying forests and just litter the planet like crazy. We waste resources that are not infinite and they will soon run out, if we continue our practice. In the past 60 years, 60% of the Earth’s ecosystem has been degraded. To date, we have extracted approximately 23 billion tons of resources from the Earth. It’s a continuous practice, and has persisted in spite of our best efforts to reduce. Our natural ecosystems are finding it hard to cope with the different pressures and are unable to adjust. If we continue depleting resources and destroying our environment, soon it will be too late for them to recover, even with our help.

Question 1

According to the passage which of the following are incorrect:

(1) We may keep destroying our ecosystem to meet our energy needs, but we should take steps to recover them later.
(2) Deforestation is caused by expansion of agricultural practices.
(3)  We are not making any efforts to change our practices.
(4) Our ecological resources are not infinite and we will soon run out of them.

A) 3 only

B) 1 & 3 only

C) 1,2 & 3

D) All of the Above

Question 2

According to the passage, which of the following are reasons for deforestation?

(A) Illegal logging

(B) Govt sanctioned logging

(C) Population explosion of cattle

(D) Wild-animal grazing

Question 3

According to the passage, we must stop the practice of ecological destruction

(A) as soon as our basic needs are fulfilled, without being greedy.

(B) before it is too late.

(C) before the apex wildlife goes extinct.

(D) as soon as we fulfil  the needs of human welfare.

Question 4

Which of the following are true about sustainable ecosystems?

(1) They are stable.
(2) They are healthy.
(3) They are capable for reproducing.
(4) They have a rich diversity of species.

Select the correct answer from choices given below:

A) 1 & 2 only

B) 1, 2 & 3 only

C) 3 & 4 only

D) All of the above.

Question 5

If x% of y is twice z% of y, what could be the value of x, y and z respectively?

(A) 25, 100, 50

(B) 66, 100, 33

(C) 12.5, 25, 50

(D) 37.5, 75, 100


1. (A) 2. (D) 3. (C) 4. (D) 5. (C)

1. The only arrangements possible that satisfy all given conditions are DABC or CBAD. Thus, only A is adjacent to D.

2. If Alok and Bhupesh have the same amount of money as Chander and Dinesh, then each pair will have Rs.50 out of a total of Rs.100.
Now, in the Rs.50 shared by Alok and Bhupesh, Alok has Rs. 10 more than Bhupesh. So, Alok has Rs. 30 and Bhupesh has Rs.20.
And, in the Rs.50 shared by Chander and Dinesh, Chander has half the amount as Bhupesh. So, Chander has Rs.16.66 and Dinesh has Rs.33.33.

3. LCM of 18, 24 and 32 = 288. So, the bells will ring together after 288 minutes i.e. 4 hours and 48 minutes after 8 am. This time will be 12:40 pm, or 12 minutes before 1 pm.

4. Students who speak only English + Students who speak only Hindi + Students who speak both languages = Total number of students = 50.
Consider English. If 21 speak English and 10 of them also speak Hindi, then no. of students who only speak English = 21 – 10 = 11.
So now, Students who speak only English (11) + Students who speak only Hindi + Students who speak both languages (10) = 50, which means Students who speak only Hindi = 29.

5. Tickets sold at Rs.5 = (1/2)*420 = 210.
Tickets sold at Rs.3 = (1/3)*420 = 140.
Tickets sold at Rs.2 = 420 – 210 – 140 = 70.
Total amount collected = 210*5 + 140*3 + 70*2 = Rs.1610

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  • ngk


  • M Singh2

    Questions missing??