Some amazing research that will astound your mind
Q&A
- WHY DO SOME FISH HAVE COLOURLESS BLOOD ?
ANS:- Antarctic Icefish have colourless blood with no red blood cells and no haemoglobin,the oxygen carrying pigment.This probably comes down to genetic mutation,and means their blood carries 90% less oxygen than red blood.They survive partly because frigid antarctic waters are oxygen-rich. Icefish also have enormus hearts that pump huge volumes of blood around their bodies,making sure that get enough oxygen.Antifreeze in their blood stops them from freezing (the salty Southern Ocean gets down to -2 degree C) but, as they are so well-adapted to the cold,their future in a warming world remain uncertain.
2. WHY DO ROCKETS FOLLOWS A PARABOLA AFTER LAUNCH ?
ANS:- We have long been taught that all projectiles follow a curved path known as parabola. The explanation is that, as they fly ,they cover distance both horizontlly and vertically-but only the latter is affected by the force of gravity, which bends the path of projectile into parabola. For long-range rockets, things are more complex. For example, air resistance must be taken into account. But,even ignoring that ,a projectile doesn't really follow a parabola- because Earth is not flat. This means that gravity doesn't simply pull objects straight back down. Instead,it pulls them towards the centre of the Earth, whose direction changes as the projectile moves further down-range,away from the launch site .Detailed calculations then reveal that the true trajectory is not a parabola,but an ellipse.
3. HOW DO WE TALK IN OUR HEADS ?
ANS:- Talking in our heads is reffered to by psychologists as 'inner speech' . It involves some similar processes to 'overt' speech- it recruits brain regions invlved in language , such as the Broca's and Wernicke's areas ,and is even accompained by minute muscles movements in the larynx.However, there are notable differences too, with brain areas useful in inhibiting overt speech playing a greater role in inner speech.The exact brain mechanisms involved may come down to why we are talking in our heads in the first place .For example, when we read a book, brain region involved in attention may be more active than when we are mentally preparing for a race.
4.DO TREES REDUCE AIR POLLUTION LEVELS ?
ANS:- The relationship between trees and air pollution is a complicated one. particulate matter suspended in polluted air tends to settle onto leaves ,and certain gases including nitrous dioxide (NO2) are absorbed by leaves' stomata,filtering the air and reducing pollution level slightly. But trees and other vegetation also redirects airflow in their immediate vicinity,preventing pollution from being diluted by currents of cleaner air. In particular, tall trees with thick canopies planted along side busy roads can act like a roof, trapping pockets of polluted air at ground level.To reliably improve air quality,city planners need to give careful consideration to how trees are placed.
5. DO ALL FISH AND SHELLFISH CONTAIN MERCURY ?
ANS:- Mercury levels in the oceans have tripled since the Industrial Revolution,thanks to mining and burning of fossil fuels.All sea creatures absorb some of this heavy metal directly, and, once its in the body, there's no way of getting rid of it. The amount of mercury in fish varies between species. Long-lived predators like tuna and swordfish tend to contain the most,because they also absorb mercury from their prey and they've had a long time to accumulate it. The lowest levels are found in short-lived species lower down the food-chain ,such as oysters and shrimp.
