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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This confusion is due to their literal meaning. However, are they actually the same?

Watch out our video to understand the difference and the factors that separate these two from one other.

At ExperiHub, we make you enjoy Science and understand the concepts at the right age and right stage!

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In physics, different quantities are often represented on graphs and very commonly time is represented on the horizontal x-axis. But does time always have to go on the x-axis?

Generally, time is always on the x-axis, because it allows for other quantities to be represented as functions of time, which is useful in physics. Time is also, in most cases, independent of other variables, which conventionally means that it should be on the x-axis.

Watch out the video to get the answer.

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What exactly is happening inside your mouth?

Watch out this interesting video to get the answer!

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https://youtu.be/6gIFGVkfp2k

In such a case, even a thinner sheet of cotton above the blanket does wonders!! Have you ever wondered what could be the reason behind this? Put your genius brain cells to work and try to come up with a possible explanation for this. And in case you’re still unclear, don’t worry, Experihub is here to help!

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