HOTS (High Order Thinking Skills) Questions are skills that involve learning that goes beyond mere comprehension. At ExperiHub, we explain CBSE and NCERT HOTS through real-world examples and at-home experiments to better understand these concepts.

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Hurricanes form over warm ocean waters. Sometimes they strike land. When a hurricane reaches land, it pushes a wall of ocean water ashore. This wall of water is called a storm surge. Heavy rain and storm surge from a hurricane can cause flooding.

Once a hurricane forms, weather forecasters predict its path. They also predict how strong it will get. This information helps people get ready for the storm.

There are five types, or categories, of hurricanes. The scale of categories is called the Saffir-Simpson Hurricane Scale. The categories are based on wind speed.

• Category 1: Winds 119-153 km/hr (74-95 mph) – faster than a cheetah
• Category 2: Winds 154-177 km/hr (96-110 mph) – as fast or faster than a baseball pitcher’s fastball
• Category 3: Winds 178-208 km/hr (111-129 mph) – similar, or close, to the serving speed of many professional tennis players
• Category 4: Winds 209-251 km/hr (130-156 mph) – faster than the world’s fastest rollercoaster
• Category 5: Winds more than 252 km/hr (157 mph) – similar, or close, to the speed of some high-speed trains

read more: Water pollution – Wikipedia

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During daytime, plants take in carbon dioxide and release oxygen in the process of photosynthesis in the presence of sunlight. However, they even respire simultaneously and hence also take in oxygen and release carbon dioxide. But the production of oxygen is more than the production of carbon dioxide. Hence, if we sleep under a tree during daytime, we may get a good amount of oxygen, thus giving us a nice sleep. However, at night, plants do not perform photosynthesis due to the absence of sunlight. But respiration still goes on. Hence, as compared to oxygen, the proportion of carbon dioxide around the trees is more. Thus, if we sleep under a tree at night, we may feel suffocated due to lack of oxygen. Moreover, inhalation of excess carbon dioxide is harmful to our lungs and health. Therefore, it is not good to sleep under a tree at night.

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The summer solstice occurs during summer.This is the June solstice (usually 20 or 21 June) in the Northern hemisphere and the December solstice (usually 21 or 22 December) in the Southern.On the summer solstice, Earth’s maximum axial tilt toward the Sun is 23.44°. Likewise, the Sun’s declination from the celestial equator is 23.44°.

Since prehistory, the summer solstice has been seen as a significant time of year in many cultures, and has been marked by festivals and rituals. Traditionally, in many temperate regions (especially Europe), the summer solstice is seen as the middle of summer and referred to as “midsummer”; although today in some countries and calendars it is seen as the beginning of summer.

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Q. WHEN YOU RUN, YOUR BREATHING BECOMES FASTER AS YOU NEED MORE OXYGEN. BUT WHY DOES YOUR RATE OF HEARTBEAT ALSO INCREASE?

When you run, your oxygen intake increases because you require a constant supply of it in order to produce more energy. Hence to meet this requirement, your heart also begins to beat faster which leads to a faster pulse. Breathing thus becomes harder since our lungs need to take in more fresh air.

In addition to our lungs, our muscles also burn energy during running. In fact during a run, our muscles require up to three times more Oxygen as compared to the time when they are resting. Hence for our muscles to stay energetic, blood must circulate through them.

This pumping of the blood is done by the heart, which in turn causes the heartbeat to increase.

Conclusion: Hence, Running causes the heart rate to rise because the muscles require more oxygen-rich blood because they are working harder than while walking. The heart beats faster so that the heart supplies more oxygenated blood and nutrients to the body muscles.

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Ans. Cotton and paper, both are plant products and they both contain an organic compound named ‘Cellulose’. So while burning cotton and paper, when this cellulose is burnt it gives out a similar characteristic smell. Hence when we burn cotton, it smells just like burning paper.

On the other hand, As we all know, wool is obtained from animal fleece or hair. Animal hair has protein fibre (keratin) which also contains some Sulphur containing amino acids in it. Human hair also is made up of the same fibre protein keratin. Hence on burning, wool smells very similar to that of burnt hair.

Now answer this:

Paheli went to the market to buy sarees for her mother. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree?

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The pollution from local factories and oil refinery at #Mathura are also to blame for. These factories produce pollutants like Sulfur Dioxide and Nitrogen Dioxide, which react with atmospheric oxygen. These gases further react with the water molecules present in the air forming Sulphuric acid and Nitric Acid. These acids then precipitate in the form of acid rain that falls on the Taj.

The acid rain then digests and destroys the outer layer of Taj Mahal – thus turning the white marble yellowish and also leading to cracks in the marble. The acids in the acid rain react with calcium carbonate of marble and degrade it. This phenomenon is also called #Marblecancer, which slowly corrodes away the marble. In addition to this, 2000 metric tons of waste is being dumped into the drains which eventually lead to the river Yamuna, which flows along the monument, further aiding the slow tarnishing of one of the world’s most beautiful man-made creations.

Another potential cause of the Taj losing its shine is the #tourists themselves. Every year, a large number of people visit the Taj Mahal. With so many people walking over this #marblebeauty, there is bound to be some wear and tear. The humidity level inside the building rises as a result of hosting such a huge population every day, gradually darkening its walls and floor.

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