The natural world and its cycles profoundly influence every aspect of human life, from our sleep to our moods. The IELTS reading passage **”The Natural World”** explores the circadian rhythm and our individual body clocks. In this article, we will decode various question types (True/False/Not Given, Short Answer, Summary Completion) with detailed answers and analysis, while extracting valuable vocabulary and effective strategies to help you confidently conquer the IELTS Reading test.
Reading Content: The Natural World & Questions
A. The natural world is dominated by cycles that are constant and repeated – the moon’s rotation around the earth, the changing of the seasons, the changes between night and day. It is these cycles or rhythms that in part control changes in our metabolism, mood and behaviour, and even the patterns of our sleep.
B. The circadian rhythm is the cycle that indicates when to be awake and when to be asleep. This is a daily cycle that is controlled by changes in amplitude (highs and lows) of light and temperature. As day turns to night, the sun sets and it becomes cooler. The triggers of less light and lower temperatures signal to the body that it is time to slow and begin the pattern of sleep. Of course, there may be many hours between sunset and the time people actually go to bed, but it is from this time that we generally become increasingly less alert and reaction times can be noticeably slower.
C. There are a number of factors that can affect our circadian rhythm. Working night shifts, which requires people to act in contradiction to the body’s natural rhythm, is perhaps the most damaging. Despite getting a good 8 hours sleep during the day, night shift workers still tend to feel drowsy for at least some of the night. This is the main factor for the increase in workplace accidents on this shift when compared to the day shift. The seasons can also affect our natural rhythm, with people having less energy during winter months when there is less sunlight and warmth to stimulate the brain. International travel, notably when travelling in excess of 4 hours, can also have a significant effect; in extreme cases, it can take up to 7 days for your rhythm to reset due to this, a phenomenon referred to as jet lag. A similar, although milder, effect can be felt in countries with daylight savings time, when the clocks are moved forward and backward depending on the season.
D. There are some tips for helping your body work with your circadian rhythm. First thing in the morning take a short walk outside or open all the curtains to get as much light as possible through the eyes and into the brain. Lighting levels that affect circadian rhythm in humans are higher than the levels usually used in artificial lighting in homes. In addition to the strength of the light, wavelength (or colour) of light is a factor, the best being that present in sunlight. Plan your work and other activities around the highs and lows of your temperature rhythm. For example, plan easier activities for first thing in the morning when you’re not operating at your physical best. Late morning is better for challenging tasks. After lunch you may feel like nodding off. Take scheduled breaks. The best time to exercise is in the late afternoon – your body temperature reaches its daily high, it is warmed up and stretched from spending your day at work. Avoid driving during sleep times. Sleepy drivers should stop for a nap – playing loud music or leaving windows open is an overrated misconception. At night, close the blinds and curtains and sleep in a dark room. If you work the night shift, use bright lights and music in the workplace to keep your brain alert. Wear an eye mask to block out the light when you want to go to sleep.
E. Every human in fact, most non-nocturnal animals – follow the basic rules of the circadian rhythm. However, we also have our own unique body clocks which control the daily changes in how we think and feel, and oversee a number of our personal characteristics such as sleep patterns. Your body clock dictates whether you are a night owl, happy to work late into the night, an early bird who prefers the morning or a humming bird, happy to work both ends of the day. Your body clock determines not only your personal sleep patterns, but also whether or not you are grumpy before you have your morning coffee, when and what you need to eat throughout the day, whether you work better in the morning or the afternoon and the best time for you to do exercise. It also affects physical performance, such as temperature, blood pressure, digestion, hormone levels and brain activity (such as mood, behaviour, and alertness). Your body clock is what causes you to gain a few kilograms in autumn and winter time and to make it easier to lose weight in spring and summer.
F. Being aware of a few issues can help us maintain the best rhythms for our body docks, but there are some tips and tools for that can help. Keeping to the same bedtime routine and wake-up schedule, even on your days off, is particularly important – there should be no more than a few hours difference in the time you go to bed. Avoiding interruptions to your sleep is also very important. If there is intermittent, irregular noise, use a fan or any white noise device that generates calming sounds. This is particularly important for night shift workers, for whom daytime noises are generally louder; soft, background noise can help drown out daytime activity noises. Eat small frequent meals to help stoke your metabolism. This is not only helpful in weight maintenance, but reinforces the “day” phase of your circadian clock. Eat most of your energy foods earlier in the day and avoid eating a heavy meal near bedtime. Avoid all-nighters, like studying all night before an assessment. Cutting back on sleep the night before may mean that you perform less well. Reduce changes to your work shift, such as changing from night shift to day shift. Avoid alcohol and cigarettes before sleep time. If you feel sleepy during the day, take a short nap. Set an alarm so you sleep for no more than about 20 minutes. Anything more than just a ‘catnap’ and you will enter into Stage 3 (deep sleep) and find it harder to wake up from.
Questions 24 – 30
Do the following statements agree with the information given in the reading passage?
TRUE if the statement agrees with the information
FALSE if the statement contradicts the information
NOT GIVEN if there is no information on this
24. Our reactions are at their slowest at sunset.
25. There are more accidents on the night shift because workers tend to get less sleep.
26. Limited air travel has minimal effect on the body’s circadian rhythm.
27. The circadian rhythm starts when light reaches the brain.
28. If a driver is tired, taking a short sleep, listening to music or winding down the window are all equally effective measures for keeping awake.
29. Humans share the same trends with regards their body clocks.
30. Many people take a short rest just after eating lunch.
Questions 31 – 36
Answer the questions below using NO MORE THAN THREE WORDS from the passage for each answer.
31. As well as the intensity, what else is important in sunlight for our circadian rhythm?
32. What specific part of the day is the body at its warmest?
33. What should night shift workers use to help them sleep?
34. What type of person works equally well in the morning and the evening?
35. What does our body clock make it easier to do after the winter?
36. What should you avoid before bed to help you get a good night’s sleep?
Questions 37 – 40
Complete the summary below. Choose NO MORE THAN TWO WORDS from Reading Passage 3 for each answer.
Keep a good (37) _ by following routines. Try to sleep and wake at roughly the same times when working and on days off. Use (38)_ noise to help you sleep if there are external distractions. Small and regular meals keep your (39)_ operating at its best. Limit changes to your work shift, and if necessary take a short (40)_ during the day.
Key Vocabulary Summary
- Metabolism (n): The chemical processes that occur within a living organism in order to maintain life.
- Circadian rhythm (n): A natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.
- Amplitude (n): The maximum extent of a vibration or oscillation.
- Drowsy (adj): Sleepy and lethargic.
- Contradiction (n): A combination of statements, ideas, or features which are opposed to one another.
- Jet lag (n): Extreme tiredness and other physical effects felt by a person after a long flight across several time zones.
- Daylight savings time (n): The practice of advancing clocks during warmer months so that darkness falls at a later clock time.
- Wavelength (n): The distance between successive crests of a wave.
- Overrated misconception (n): A widely held but false belief that is given more importance than it deserves.
- Non-nocturnal animals (n): Animals that are active during the day.
- Night owl (n): A person who prefers to stay up late at night.
- Early bird (n): A person who prefers to wake up early in the morning.
- Humming bird (n): (In this context) A person who is productive at both ends of the day.
- Grumpy (adj): Bad-tempered and irritable.
- Intermittent (adj): Occurring at irregular intervals; not continuous or steady.
- Irregular noise (n): Noise that does not follow a consistent pattern.
- White noise device (n): A device that produces a sound containing many frequencies with equal intensity to mask other noises.
- Stoke your metabolism (v): To stimulate or increase the rate of metabolism.
- All-nighters (n): A period of work or study that lasts all night.
- Catnap (n): A short, light sleep.
- Heavy meal (n): A large or rich meal that is difficult to digest.
Answers & Detailed Explanations
Questions 24 – 30: TRUE / FALSE / NOT GIVEN
24. Our reactions are at their slowest at sunset.
Evidence (Paragraph B): “Of course, there may be many hours between sunset and the time people actually go to bed, but it is from this time that we generally become increasingly less alert and reaction times can be noticeably slower.”
Analysis: The text states that from sunset onwards, reaction times can become noticeably slower, but it does not claim that sunset is the slowest point of the day. It is merely the starting point of the decline.
Answer: FALSE
25. There are more accidents on the night shift because workers tend to get less sleep.
Evidence (Paragraph C): “Despite getting a good 8 hours sleep during the day, night shift workers still tend to feel drowsy for at least some of the night. This is the main factor for the increase in workplace accidents on this shift…”
Analysis: The text notes that night shift workers can get 8 hours of sleep but still feel drowsy, and this drowsiness—not a lack of sleep—is the primary cause of accidents.
Answer: FALSE
26. Limited air travel has minimal effect on the body’s circadian rhythm.
Evidence (Paragraph C): “International travel, notably when travelling in excess of 4 hours, can also have a significant effect…”
Analysis: The text only mentions that international travel exceeding 4 hours has a significant effect. It provides no information regarding “limited” air travel (e.g., flights under 4 hours). We cannot infer this from the text.
Answer: NOT GIVEN
27. The circadian rhythm starts when light reaches the brain.
Evidence (Paragraph B): “This is a daily cycle that is controlled by changes in amplitude (highs and lows) of light and temperature. As day turns to night, the sun sets and it becomes cooler. The triggers of less light and lower temperatures signal to the body that it is time to slow and begin the pattern of sleep.”
Analysis: The text explains that the rhythm is controlled by changes in light and temperature. Reduced light is a “trigger” for sleep, but it does not state that the entire circadian rhythm starts when light reaches the brain.
Answer: FALSE
28. If a driver is tired, taking a short sleep, listening to music or winding down the window are all equally effective measures for keeping awake.
Evidence (Paragraph D): “Sleepy drivers should stop for a nap – playing loud music or leaving windows open is an overrated misconception.”
Analysis: The text confirms that a nap is the correct solution, while music or open windows are “overrated misconceptions,” meaning they are not effective. Therefore, they are not equally effective.
Answer: FALSE
29. Humans share the same trends with regards their body clocks.
Evidence (Paragraph E): “Every human… follow the basic rules of the circadian rhythm. However, we also have our own unique body clocks which control the daily changes in how we think and feel, and oversee a number of our personal characteristics such as sleep patterns.”
Analysis: While humans follow basic rules, the text explicitly states we have “our own unique body clocks,” which contradicts the idea that we all share the same trends.
Answer: FALSE
30. Many people take a short rest just after eating lunch.
Evidence (Paragraph D): “After lunch you may feel like nodding off. Take scheduled breaks.”
Analysis: The text says you “may feel like nodding off” and advises taking “scheduled breaks.” However, it does not confirm that “many people” actually do this. “May feel like” suggests a possibility, not a confirmed fact.
Answer: NOT GIVEN
Questions 31-36: Short Answer Questions (NO MORE THAN THREE WORDS)
31. As well as the intensity, what else is important in sunlight for our circadian rhythm?
- Evidence (Paragraph D): “In addition to the strength of the light, wavelength (or colour) of light is a factor…”
- Answer: wavelength (or colour)
32. What specific part of the day is the body at its warmest?
- Evidence (Paragraph D): “The best time to exercise is in the late afternoon – your body temperature reaches its daily high…”
- Answer: late afternoon
33. What should night shift workers use to help them sleep?
- Evidence (Paragraph D): “Wear an eye mask to block out the light when you want to go to sleep.”
- Answer: (an) eye mask
34. What type of person works equally well in the morning and the evening?
- Evidence (Paragraph E): “…a humming bird, happy to work both ends of the day.”
- Answer: (a) humming bird
35. What does our body clock make it easier to do after the winter?
- Evidence (Paragraph E): “Your body clock is what causes you to gain a few kilograms in autumn and winter time and to make it easier to lose weight in spring and summer.”
- Answer: lose weight
36. What should you avoid before bed to help you get a good night’s sleep?
- Evidence (Paragraph F): “Avoid alcohol and cigarettes before sleep time.”
- Analysis: The text mentions both “heavy meal” and “alcohol and cigarettes.” However, “alcohol and cigarettes” is explicitly linked to the advice for before sleep time and fits the three-word limit.
- Answer: alcohol and cigarettes
Questions 37 – 40: Summary Completion (NO MORE THAN TWO WORDS)
37. Keep a good (37) by following routines.
- Evidence (Paragraph F): “Being aware of a few issues can help us maintain the best rhythms for our body clocks…”
- Analysis: The summary refers to maintaining something good by following routines. “Rhythm” fits perfectly in this context.
- Answer: rhythm
38. Use (38) noise to help you sleep if there are external distractions.
- Evidence (Paragraph F): “If there is intermittent, irregular noise, use a fan or any white noise device that generates calming sounds.”
- Analysis: Since the summary already includes the word “noise,” we only need the modifier. “White” is the correct term to complete the phrase “white noise.”
- Answer: white
39. Small and regular meals keep your (39) operating at its best.
- Evidence (Paragraph F): “Eat small frequent meals to help stoke your metabolism.”
- Answer: metabolism
40. Limit changes to your work shift, and if necessary take a short (40) during the day.
- Evidence (Paragraph F): “If you feel sleepy during the day, take a short nap.”
- Answer: nap
The “The Natural World” reading passage provides deep insight into biological cycles and how we can optimize our lifestyles according to our body’s natural rhythm. By analyzing these answers, we hope you have strengthened your reading comprehension and information-retrieval skills. Apply these insights not only for IELTS but also to build a more scientific and healthy lifestyle.
For more IELTS Reading practice, check out these resources compiled by ECE:
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