Important Questions For All Chapters – English Class 8
1. Why do we need to sleep?
Answer : Sleep is necessary for the body and brain to develop and grow. It helps repair muscles, skin, and other parts of the body while also aiding in concentration and memory.
2. How long does an average adult sleep?
Answer : On average, an adult sleeps for seven hours and twenty minutes each night, although some may need less or more sleep.
3. How many sleep cycles occur during a normal night?
Answer : A normal night includes about 5 to 6 sleep cycles, each lasting around 90 minutes.
4. What happens during REM sleep?
Answer : During REM (Rapid Eye Movement) sleep, the brain becomes active, and dreams occur. The eyes move rapidly under the eyelids during this stage.
5. At what stage of sleep do you dream?
Answer : Dreams typically occur during the REM sleep stage.
6. Why do elderly people need less sleep?
Answer : Elderly people require less sleep than younger individuals due to changes in their bodies and often take naps during the day.
7. What are the common causes of sleep problems?
Answer : Common causes of sleep problems include worry, depression, noise, light, temperature changes, and illness.
8. What can happen if someone regularly misses sleep?
Answer : Missing sleep regularly can lead to impaired judgment, difficulty concentrating, irritability, and strange behavior.
9. What is insomnia?
Answer : Insomnia is a condition of sleeplessness where a person has difficulty falling asleep or staying asleep.
10. What are the benefits of getting enough sleep?
Answer : Enough sleep helps improve attention, creativity, mood, health, and relationships with others.
11. How does sleep affect body temperature?
Answer : During sleep, body temperature falls, reaching its lowest point in the middle of the night.
12. What are some external factors that can affect sleep?
Answer : External factors such as noise, light, temperature, and a new environment can disturb sleep.
13. Why does the body repair itself during sleep?
Answer : During sleep, the body’s muscles, bones, and skin can grow and repair injuries, helping to maintain overall health.
14. What should people avoid to deal with sleeplessness?
Answer : People should avoid becoming addicted to sleeping pills and should instead try to identify and solve the underlying causes of sleeplessness.
15. Why do we remember dreams when we wake up during REM sleep?
Answer : If someone wakes up during REM sleep, they are more likely to remember their dreams because the brain is highly active during this stage.
Long Questions
1. Why is sleep necessary for the body and brain?
Answer : Sleep is essential for the body and brain to function properly. It helps the brain process and remember information learned during the day. Sleep also allows the body to repair tissues, grow muscles, and heal injuries. Without enough sleep, a person can struggle with attention, creativity, and overall health. A lack of sleep can also make it harder for the body to fight sickness and recover from illness.
2. Explain the five stages of sleep.
Answer : Sleep is divided into five stages. Stages 1 and 2 are light sleep, where the body begins to relax but is not yet in a deep sleep. Stages 3 and 4 are deep sleep stages, where breathing and heart rate slow down, and the body becomes motionless. The final stage is REM sleep, where the brain becomes highly active, and dreams occur. This cycle repeats 5 to 6 times a night, each cycle lasting about 90 minutes.
3. What are the consequences of sleep deprivation?
Answer : Sleep deprivation can have serious consequences, including memory problems, difficulty concentrating, mood swings, and impaired judgment. Over time, missing sleep can lead to more severe problems such as hallucinations, anxiety, and a weakened immune system. Regular sleep deprivation can also impact relationships and reduce a person’s ability to function in daily activities.
4. How much sleep do people of different age groups require?
Answer : Different age groups require different amounts of sleep. Babies need the most sleep, about 14 to 18 hours a day. Children aged 5 to 12 need 10 to 11 hours, while adults need around 7 to 8 hours. The elderly require less sleep than younger adults, often compensating with daytime naps.
5. Why are sleeping pills not recommended for treating insomnia?
Answer : Sleeping pills are not recommended for treating insomnia because they do not address the root cause of sleeplessness and can lead to dependency. The author suggests that it is better to identify and remove the causes of sleeplessness, such as stress or environmental factors, rather than relying on medication. Overuse of sleeping pills can result in addiction and make it more difficult for the body to fall asleep naturally.
6. What happens to the body during deep sleep?
Answer : During deep sleep (stages 3 and 4), the body becomes completely relaxed, and heart rate and breathing slow down. The muscles are still, and the body focuses on repairing tissues, growing muscles, and strengthening the immune system. This is the most restorative phase of sleep, crucial for physical health and recovery.
7. Discuss the effects of a lack of sleep on mental and emotional health.
Answer : A lack of sleep can significantly affect mental and emotional health. People who do not get enough sleep may become irritable, anxious, and unable to manage stress effectively. They may also struggle to concentrate, make decisions, or solve problems. Over time, sleep deprivation can lead to more severe mental health issues, including depression and anxiety disorders.
8. Why does body temperature change during sleep?
Answer : The body follows a 24-hour cycle known as the circadian rhythm, which regulates body temperature. During sleep, body temperature drops, reaching its lowest point in the middle of the night. This drop in temperature helps the body conserve energy and is part of the natural process of falling asleep and staying asleep.
9. What can cause temporary sleeplessness, and how can it be managed?
Answer : Temporary sleeplessness can be caused by factors such as stress, noise, changes in the environment, illness, or emotional upset. It can be managed by creating a calming bedtime routine, reducing exposure to screens and bright lights, and addressing sources of stress. In some cases, short-term sleeplessness resolves on its own without the need for medication.
10. What role does REM sleep play in memory and learning?
Answer : REM sleep is crucial for memory consolidation and learning. During this stage, the brain processes and stores information learned during the day. It helps in organizing thoughts, solving problems, and retaining memories. Without sufficient REM sleep, people may struggle with retaining information and learning new skills.
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