DAK

Hi! We humans as a super-intelligent species on the earth have some genuine questions in our mind. We don't know their correct answers yet but, one day we may get all answers with evidence. Those questions are about aliens. Yes, I know it's one of the most controversial yet blur topics to conclude anything related but a good one to discuss.  We want to know, do aliens exist? If yes, then where are they? How do they look? From where they came? There are many other questions but, the most important question is how they look at us as their friend or enemy, predator or prey. If we look back into history there are mentions of many creatures who were different in appearance from any present animal on Earth right now. Who are those mythological creatures that appeared in the history of many civilizations? There are mentions of giants in the mythology of Egyptian civilization who were worshiped by humans as gods. It's possible that they built pyramids at Giza because the stone bloc...

W.H. Sheldon William Herbert Sheldon was a American psychologist who  classified personality of an individual on the basis of body posture and shape  which are endomorph, mesomorph and ectomorph. Endomorphs Endomorphs have short arms and legs. that is their limbs are shorter due deposition of adipose tissue. It is hard for them to loose weight. They have soft body and have high capacity for high fat storage. Their excessive mass hinders their ability to compete in sports, but those sports which requires strength like weight lifting, powerlifting and wrestling are suitable for them. Mesomorphs Mesomorphs have athletic physique and body composition, their chest and shoulder are broader than their waistline.  They can easily gain or loose weight. they can perform well in sports need strength, agility and speed. Ectomorphs Ectomorphs are slim. they have elongated muscled and limbs, They usually face great difficulties in gaining weight. Their chest is also flat and have less ...

  What is DNA fingerprinting?   Alec Jeffreys DNA fingerprinting is a technique to identify a person based on his/her DNA specificity. Every individual organism is unique. Thus every person has unique DNA fingerprint. It can't change by any known technique. It is a quick way to compare the DNA sequences of any two individuals. DNA fingerprinting developed by Alec Jeffreys.     Paternity test Applications:   Paternity test Criminal Identification Determination of population diversity Determination of genetic diversity   Principle: It has found that the DNA of an individual carries some specific nucleotide sequences which don't code for any information or proteins. These sequences repeated many times and found at many places throughout the DNA. These sequences of satellite DNA which are very specific in each individual and vary in number from person to person and are inherited. These are a variable number of tandem repeats (VNTRs). Each individual inherits th...

 We all know that photon is a mass-less and charge-less particle. It moves with the speed of light that is 299792458 m/s. According to Einstein's theory of special relativity if an object moves with the speed of light consistently in a straight line, then it can travel in the time. Anybody who can travel in the time can change history and solve the mystery. Thus to make a time machine we have use photon, as an engine as well as fuel. To tow the wagon which will be developed by opaquest and the lightest material. For this, we need an enormous amount of photons. Then we might be able to travel with them with the speed of light. For this firstly, we have to find a way to trap the photons.  Time travel might be subject to the risk of existence, life and age of any individual or object.

Bacteriophages are the virus. These are non-cellular organisms. Thus they are not considered as living. They seem to be mechanical as someone made them. They are motile. Consists of a crystalline head, collar, sheath and tail fibres. They contain RNA as genetic material.    They found everywhere from eyes to eyelids. They found much more than any organism. They are the deadliest being on the planet. They daily kill 40% of bacteria in the oceans. They are much smaller than our cells and bacterias. They are known as bacteriophages because of they phages bacteria. Each bacteriophage terminates specific bacteria. When bacteriophage finds it's victim, then it injects its genetic material inside the bacteria. This produces many new phages inside the bacteria body, which releases an enzyme called endolysin. This enzyme punches the hole and causes bacteria to burst. With the burst, those bacteriophages come out in the environment. Fortunately, bacteriophages can't harm us even...

  When it comes to carbon, most people will think of coal. But few will remember what they studied in 10th standard, about the allotropes of carbon, namely Graphite, Diamond and Fullerenes. Let us discuss that in brief.  GRAPHITE: - Graphite structure  It is the form of carbon in which atoms are arranged hexagonally, layer by layer. It is the most stable form of carbon. Therefore, its formation enthalpy is taken as zero. It conducts electricity as the electrons can move freely.  Lead of pencil is made up of graphite It is very soft and slippery. Oils cannot be used at high temperature. Therefore, it is used as a lubricant for machines at very high temperature. It is also used as fibres in plastic for great strength. Every layer of graphite has a gap of 340 picometers from each other. Each carbon has sp2 hybridisation.   DIAMOND: -  Structure of Diamond It is the form of carbon with a crystal structure. It is the hardest sub...

CHARACTERISTICS —Located underground —Shows positive geotropism —Shows negative phototropism—Non-green, usually brown — Branched or unbranched—Do not have buds —Do not have nodes and internodes FUNCTIONS •Absorption of water and minerals •Anchorage (support from the base) TYPES TYPE 1.-TAPROOT When radicle germinated to form primary roots that are branched further into secondary and tertiary roots. E.g.- Dicot plants   TYPE 2.-FIBROUS ROOT When radicle germinated to form much fiber like roots. E.g.- Monocot plants TYPE 3.-ADVENTITIOUS ROOT These roots arise from other parts of the plant rather than radicle. E.g.- prop roots in the Banyan tree  MODIFICATIONS 1.Storage root: They have reserve food  Conical- e.g.- carrot                               Fusifor...