BGS National Public School
Hulimavu, Bangalore –
560076
Date: 02nd and 05th August 2013
Tell Me Why – Questions (Classes VI to XII)
Name of the student
|
Class
|
Question
|
|
1.
|
Srilalitha
|
XI
|
Why
centrifugal force is called pseudo force?
|
2.
|
Gomini C M
|
XI
|
What is meant by pressure
potential?
|
3.
|
V J Prashanth
|
VI C
|
Why is it said that we should
not breathe through our mouth?
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4.
|
Aditya Krishna
|
VI C
|
What is AIDS?
Which virus causes it?
|
5.
|
Nirmalya Dey
|
IX B
|
Why are cilia not present in the oesophagus, but present in
the trachea?
|
6.
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Aditya M
|
VI C
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How do we get hiccups and
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7.
|
Bhuvan S
|
VI A
|
Why do finger nails grow four times faster than the toe
nails?
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8.
|
Ankita S
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VIII A
|
Why there are 28 days in the month of February, when there
are 30 or 31 days in other months?
|
9.
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Shrilaxmi P. L.
|
VIII A
|
Why don’t dwarves grow tall?
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10.
|
Shashi A
|
VI E
|
When look at our image in front of the spoon we find it is
inverted and when we look at the back of the spoon, we see that our image is
upright, why?
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11.
|
Sai Charan
|
VIII C
|
When we wake up in the morning, if the light is on, we
cannot open our eyes for some time, why?
|
Note: Students to answer the questions and post it with full
name, class and section mentioned below.
Principal
hi srilalitha,
ReplyDeleteThis is because it is not a force. It is a reflection of newtons 1st law, any object will continue along it path in a straight line unless another force acts on it.
So when an object is constrained to rotate around a point, a circular path, it at all times will try to 'fly off' on along a tangent (a straight line from where it is now). This is what is called centrifugal forces. The only real force that acts is centripetal force, which is the force required to keep the object on circular path. This force acts directly towards the centre of the circle about which the object rotates.
Pseudo, i believe, is some sort of Latin term for fake. because centrifugal force is not real, and thusly "fake", the connection was made.
Yuvashri Bhanuprakash IX A
hi Gomini,
ReplyDeletepressure potential is the hydrostatic pressure to which water in a liquid phase is subjected. In a turgid plant cell, pressure potential is usually positive.
Yuvashri Bhanuprakash IX A
hi Prashanth,
ReplyDeleteThe lungs are a primary source of our energy level. They extract oxygen from the air we breathe primarily on the exhale. Because the nostrils are smaller then the mouth, air exhaled through the nose creates back pressure when one exhales. It slows the air escape so the lungs have more time to extract oxygen from them. When there is proper oxygen-carbon dioxide exchange, the blood will maintain a balanced pH. If carbon dioxide is lost too quickly, as in mouth breathing, oxygen absorption is decreased. The nostrils and sinuses filter and warm the air going into the lungs. The mouth breather bypasses this. The sinuses produce nitric oxide (NO) which is a pollutant but harmful to bacteria in small doses. Mouth breathing also accelerates water loss increasing possible dehydration.
Each nostril is innervated by five cranial nerves from a different side of the brain. Each nostril functions independently and synergistically in filtering, warming, moisturizing, dehumidifying, and smelling the air.
When you breathe properly, you provide the body with oxygen, which feeds all the vital organs and muscles of the body.
It is also said that your nose has vital nervous system connections to your lungs and heart. Not breathing well through your nose can alter your heart rate and blood pressure, as well as to increasing your stress response.
Yuvashri Bhanuprakash IX A
hi Bhuvan,
ReplyDeleteVery interesting question...:-) To fully grasp what’s going on here, it’s important to understand exactly how your fingernails grow. Every type of cell in our body grows at different rates. For example, we know that hair grows faster than bones and cancer grows faster than anyone would like. Fingernails grow at a rate of about 3.5 millimeters per month and toenails grow about 1.6 mm per month on average. The exact rate at which your nails will grow depends on several factors. They include things like: age, sex, diet, exercise, and even the time of year. Our nails consist of many different parts. The visible part is known as the nail plate. Below this is the nail bed. The white, half-moon shaped part at the base of your nail is called the lunula (also known as the distal matrix). The tissue over the top of the matrix is called the cuticle, and the soft tissue directly over your cuticle, is called the eponychium.
The nail itself is grown from the matrix (presumably your big toe is “The One”). It lies beneath the fingernail and extends several millimeters into the finger. 90% of nail growth comes from here. The matrix consists of epithelial cells (the most common type of cells that make up numerous things in our bodies, like skin) that grow and divide. These cells contain proteins called keratin. Once the cells begin to reach the end of their life cycle, they go through a process called Keratinization, also known as cornification.
When the cell dies, it loses its nucleus and other intracellular organelles. What remains is keratin. It gets enclosed in an insoluble mixture of different proteins and lipids (fats). The enzyme responsible for this formation is known as Transglutaminase. The result is the hard nail used to pick noses and give back scratches everywhere!
Pressure within the matrix of your nail forces the dead karatinized cells out. The shape of your nail, as it grows, is merely a continuation of the angle of your matrix. It’s then guided along by the nail grooves and folds on the sides of your nail bed. Keratinized cells are not just found in your nails, but also in your hair, skin, and animal hooves. What makes them more hard, or soft, depends on their thickness and the cross-linked structure of the keratin.
When any part of our body gets injured, the natural reaction is a response that engorges the area with more blood and nutrients. So it is believed that the constant micro trauma our fingernails endure throughout the day, like tapping, typing, and bumping, allows for an even greater increase in blood and nutrient supply. Since the toes are always kept locked away safely in our socks and shoes (and in an office like environment, we’re often immobile throughout much of the day, but constantly using our fingers as we type), they don’t receive the constant “mini-trauma” that the fingernails do.
Yuvashri Bhanuprakash IX A
Pressure Potential -
ReplyDeleteA component of *water potential, represented by the symbol ψρ. Pressure potentials may be negative, in which case they represent tensions. Positive pressure potentials are termed hydrostatic pressures.
Samarth Jain VII C
Nail growth is actually caused by pressure in the nail matrix near the base of the nail since the new nail cells at the root of the nail push out the old nail cells. Then, these old nail cells harden and flatten so that they slide along the nail bed as more new cells are made.
ReplyDeleteSamarth Jain VIIC
Hi Sai,
ReplyDeleteWhen we wake up in the morning, if the light is on, we cannot open our eyes for some time, beacuse while sleep our eyes are use to dark and pupil are at resting pose. Sudden light exposure contract the pupil and hence not able to open the eyes for some time.
Calender
ReplyDeleteJulius Caesar reformed the calendar because it was out of synchronisation with the actual seasons, this in the early part of 46BC. This year ended up by being 445 days long to bring the calendar back in line the the sky's and seasons.
Not surprisingly it was called the "year of confusion."
He created a calendar that more nearly matched the annual journey of the earth round the sun. There were twelve months with alternating lengths of 31 and 30 days.
The exception was February which had 29 days and Leap years gave February 30 days to keep the calendar correct. Much of his knowledge came from the Egyptians.
The senate had the month of Quintilius renamed July after Caesar as an honour to his reform.
February 30 occurs in some calendars, but not in the Gregorian calendar, where February contains only 28, or in a leap year, 29 days. February 30 is usually used as a sarcastic date for referring to something that will never happen or will never be done. 1712 year is the only year which has 30 February of history in Sweden who still used the Julian calendar after that it was merged with Gregorian calendar.
Deletedear Sai Charan,
ReplyDeletewe cannot see if light is on in the morning when we wake up because when we are sleeping we get used to the darkness. thus, when you wake up your eyes get exposed to the light and since you were used to the light you cannot open your eyes in the light.
by Adithi Gururaja
6 A
dear Nirmalya Dey,
ReplyDeletecilia is not present in the oesophagus but it is present in the trachea because when we inhale we take in both good air and bad air that is we might take in dust which is not good for our lungs. The cilia does not allow those light particles to enter whereas the oesophagus does not need to put away light dust particles
dear V J Prashanth,
ReplyDeleteit is preferred not to breathe through our mouth as it is unhealthy and we still have our noses. we can still breathe through it
dear Bhuvan S,
ReplyDeletefinger nails grow faster than toe nails because the rate of nail growth is based on the length of the outermost finger bones.
dear Shreelaxmi P.L,
ReplyDeletePeople become dwarves when they suffer from medical
problems which is mostly due to improper diet. They cannot grow tall because of this reason.
dear Dhruv,
ReplyDeleteYes medicines are used in medicines to diagnose diseases
dear Kaveri and Anjana,
ReplyDeleteBombay blood group is a rare type of blood group which was discovered in Bombay (present day Mumbai)
in 1952
Dear Aditya Krishna ,
ReplyDeleteAIDS is a disease in which there is a severe loss of the body's cellular immunity.
Dear Gomini CM
ReplyDeleteA component of water potential that consists of the physical pressure on a solution, which can be positive, zero, or negative is called pressure potential.