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Light Pollution IELTS Reading Answers

Updated on 02 November, 2023

Gauri Agrawal

Gauri Agrawal

Sr. Content Writer

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The most effective way to prepare for the IELTS reading exam is to practice as many sample papers as possible. Here is the Light Pollution reading answers passage that will help you improve your comprehension skills and prepare for the exam.

“Light Pollution”

{A} If humans were truly at home under the light of the moon and stars, we would go into darkness happily, the midnight world as visible to us as it is to the vast number of nocturnal species on this planet. Instead, we are diurnal creatures, with eyes adapted to living in the sun’s light. This is a basic evolutionary fact, even though most of us don’t think of ourselves as diurnal beings any more than we think of ourselves as primates or mammals, or Earthlings. Yet it’s the only way to explain what we’ve done to the night: We’ve engineered it to receive us by filling it with light.

{B} This kind of engineering is no different than damming a river. Its benefits come with consequences—called light pollution—whose effects scientists are only now beginning to study. Light pollution is largely the result of bad lighting design, which allows artificial light to shine outward and upward into the sky, where it’s not wanted, instead of focusing it downward, where it is. Ill-designed lighting washes out the darkness of night and radically alters the light levels and light rhythms—to which many forms of life, including ourselves, have adapted.

{C} Now most of humanity lives under intersecting domes of reflected, refracted light, of scattering rays from overlit cities and suburbs, from light-flooded highways and factories. Nearly all of nighttime Europe is a nebula of light, as is most of the United States and all of Japan. In the south Atlantic the glow from a single fishing fleet squid fishermen during their prey with metal halide lamps—can be seen from space, burning brighter, in fact, than Buenos Aires or Rio de Janeiro.

{D} We’ve lit up the night as if it were an unoccupied country when nothing could be further from the truth. Among mammals alone, the number of nocturnal species is astonishing. Light is a powerful biological force, and in many species, it acts as a magnet, a process being studied by researchers such as Travis Longcore and Catherine Rich, co-founders of the Los Angeles-based Urban Wildlands Group. The effect is so powerful that scientists speak of songbirds and seabirds being “captured” by searchlights on land or by the light from gas flares on marine oil platforms, circling and circling in the thousands until they drop. Migrating at night, birds are apt to collide with brightly lit tall buildings; immature birds on their first journey suffer disproportionately.


{E} Insects, of course, cluster around streetlights, and feeding at those insect clusters is now ingrained in the lives of many bat species. In some Swiss valleys, the European lesser horseshoe bat began to vanish after streetlights were installed, perhaps because those valleys were suddenly filled with light-feeding pipistrelle bats. Other nocturnal mammals—including desert rodents, fruit bats, opossums, and badgers-forage more cautiously under the permanent full moon of light pollution because they’ve become easier targets for predators.

{F} Some birds—blackbirds and nightingales, among others—sing at unnatural hours in the presence of artificial light. Scientists have determined that long artificial days— and artificially short nights induce early breeding in a wide range of birds. And because a longer day allows for longer feeding, it can also affect migration schedules. One population of Bewick’s swans wintering in England put on fat more rapidly than usual, priming them to begin their Siberian migration early. The problem, of course, is that migration, like most other aspects of bird behaviour, is a precisely timed biological behaviour. Leaving early may mean arriving too soon for nesting conditions to be right

{G} Nesting sea turtles, which show a natural predisposition for dark beaches, find fewer and fewer of them to nest on. Their hatchlings, which gravitate toward the brighter, more reflective sea horizon, find themselves confused by artificial lighting behind the beach. In Florida alone, hatchling losses number in the hundreds of thousands every year. Frogs and toads living near brightly lit highways suffer nocturnal light levels that are as much as a million times brighter than normal, throwing nearly every aspect of their behaviour out of joint, including their nighttime breeding choruses.

{H} Of all the pollution we face, light pollution is perhaps the most easily remedied. Simple changes in lighting design and installation yield immediate changes in the amount of light spilt into the atmosphere and, often, immediate energy savings.

{I} It was once thought that light pollution only affected astronomers, who need to see the night sky in all its glorious clarity. And, in fact, some of the earliest civic efforts to control light pollution—in Flagstaff, Arizona, half a century ago—were made to protect the view from Lowell Observatory, which sits high above that city. Flagstaff has tightened its regulations since then, and in 2001 it was declared the first International Dark Sky City. By now the effort to control light pollution has spread around the globe. More and more cities and even entire countries, such as the Czech Republic, have committed themselves to reducing unwanted glare.

{J} Unlike astronomers, most of us may not need an undiminished view of the night sky for our work, but like most other creatures we do need darkness. Darkness is as essential to our biological welfare, to our internal clockwork, as light itself. The regular oscillation of waking and sleep in our lives, one of our circadian rhythms—is nothing less than a biological expression of the regular oscillation of light on Earth. So fundamental are these rhythms to our being that altering them is like altering gravity.

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Questions 1-6

The reading Passage has ten paragraphs A-J. 

Which paragraph contains the following information? 

Write the correct letter A-J, in boxes 1-6 on your answer sheet.

Guidelines/Tip for Answering These Types of Questions: Candidates need to read through the passage and then make the suitable choice

 A reason that contributes to light pollution.

 A city has lessened light pollution successfully.  

 The importance of darkness.

 The popularity of light pollution in the world.  

 Methods to reduce light pollution.

 The reason why we have changed the night.






Paragraph B of the passage mentions that bad lighting design, which allows artificial light to shine outward and upward into the sky, contributes to light pollution.


Paragraph I of the passage mentions that some of the earliest civic efforts to control light pollution were undertaken by the city of Flagstaff, which has lessened light pollution successfully, and it was declared the first International Dark Sky City.



Paragraph J of the passage mentions the importance of darkness and how we need darkness as it is essential to our biological welfare and internal clockwork like light.



Paragraph C of the passage mentions the high amount of light pollution all over the world as the majority of people today live beneath intersecting domes of reflected, refracted, and scattering light rays coming from brightly lit cities and suburbs, highways, and factories.



Paragraph H of the passage mentions how easy it is to reduce light pollution, and the method to reduce it includes simple modifications to lighting installation and design, which can immediately alter the amount of light that enters the atmosphere.



Paragraph A of the passage mentions how we have changed the night by filling it with light as we are adapted to living in the sun’s light.

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Questions 7-8

Choose the correct letter, A, B, C, or D. 

Write your answers in boxes 7-8 on your answer sheet.

Guidelines/Tip for Answering These Types of Questions: Candidates need to read through the passage and then choose the correct answer.

Question 7: How does light pollution influence creatures?

A  by bad lighting design

B  by changing the cities and suburbs creatures are used to

C  by changing the directions of light

D  by changing the light creatures are used to

Question 8: Some aspects of animals’ lives are affected by unwanted light, EXCEPT:

A  Migration

B  Reproduction

C  Natural life span

D  Feeding






According to the passage, creatures are affected by light pollution as they get confused by artificial light, which changes the natural light they are used to and brings about many changes in their lifestyle patterns.



According to the passage, light pollution affects various aspects of animals' lives, like migration, reproduction, and feeding patterns, but light pollution does not affect their lifespan. 


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Questions 9-13

Light pollution has affected many forms of life. Use the information in the passage to match the animals with the relevant information below. Write the appropriate letters A-G in boxes 9-13 on your answer sheet.

Guidelines/Tip for Answering These Types of Questions: Candidates need to read through the passage and then match the statements with the correct answer.


10 Horseshoe bat

11 Nightingales

12 Bewick’s swans

13 Turtles

(A) eat too much and migrate in advance.  

(B) would not like to sing songs at night.

(C) is attracted by the light and then a crash happens.

(D) suffers from food shortages because of competitors. 

(E) have become easier targets for predators. 

(F) be active at unusual times. 

(G) have trouble inbreeding.







According to paragraph D of the passage, songbirds and seabirds are "captured" by searchlights or by the light from gas flares on marine oil platforms, as they are attracted by the light and circle endlessly around it until they drop.



According to paragraph E of the passage, horseshoe bats suffered from food shortages after streetlights were installed in some Swiss valleys because the place suddenly became overcrowded with light-feeding pipistrelle bats.



According to paragraph F of the passage, some birds, like blackbirds and nightingales, sing or are active at unnatural hours due to the presence of artificial light.



According to paragraph F of the passage, Bewick's swans put on weight rapidly by eating more than usual and began their Siberian migration in advance.



According to paragraph G of the passage, nesting sea turtles have a natural inclination to dark beaches, and with fewer of them left to nest on face trouble inbreeding.

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Gauri Agrawal

Sr. Content Writer

Gauri Agrawal is a passionate, professional and proactive content marketer who wants to grow in the field of content creation. She carries a rich experience of working in the Digital News sector with renowned names like Times Now Digital, and News X as a Copy Editor.

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