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Mayank Shekhar 7 years, 3 months ago
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Gaurav Seth 7 years, 3 months ago
Following are the characteristics of kingdom Monera:
- The organisms do not possess a clearly defined nucleus, i.e., the nucleus is not enclosed by a nuclear membrane.
- Cell organelles are also not covered with a membrane.
- Organisms are unicellular, microscopic prokaryotes living in moist conditions.
- Cell wall may or may not be present.
- The mode of nutrition may be autotrophic or heterotrophic.
- Reproduction is primarily asexual by binary fission or budding.
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Rewati Raman Singh 7 years, 3 months ago
Purab Mehndiratta 7 years, 3 months ago
Posted by Afreen Dudekula 7 years, 3 months ago
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Nazia Naz 7 years, 3 months ago
Gaurav Seth 7 years, 3 months ago
Heterogeneous mixture
It is a mixture in which the particle or substances are not evenly spread or distributed as shown in the above figure. This type of mixture can be easily converted to their original shape through chemical processes. Heterogeneous mixtures are also called as suspensions or colloids. The word ‘hetero’ means different.
For example- Mud is a good example for colloids. If you mix some mud with water and keep it for few days, you can see that mud gets settled in the bottom of the container. Hence this shows that mud and water form a heterogeneous mixture. This kind of suspensions or colloids are visible to the naked eye.
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Gaurav Seth 7 years, 3 months ago
A solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The particles of solute in a solution cannot be seen by the naked eye. A solution does not allow beams of light to scatter. The solute from a solution cannot be separated by filtration (or mechanically).It is composed of only one phase.
Afreen Dudekula 7 years, 3 months ago
Posted by Staines Henry 7 years, 3 months ago
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Gaurav Seth 7 years, 3 months ago
Elements react to attain stability by completing octet of electrons, for which they lose, gain or share electrons depending upon their valency.
However some elements like inert gases have a completely filled valence orbital. (e.g. Ne = 2,8), and hence are stable and do no need to lose/gain or share electrons, thus making them unreactive
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Arti Kumari 7 years, 3 months ago
Saurav Kumar 7 years, 3 months ago
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Albert Einstein 7 years, 3 months ago
Yogita Ingle 7 years, 3 months ago
Ammonia is a compound. Ammonium is an ion (a cation). Ammonia is a molecule consisting of nitrogen and hydrogen having molecular NH3.while ammonium is an ion of ammonia or conjugate acid of ammonia that is formed by accepting hydrogen ion having chemical formula NH4+.
Posted by Vivek Mishra 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Electrovalency: The number of electrons lost or gained by an atom to get stable electronic configuration in forming ionic bond is called its electrovalency.
Ex: In getting Neon gas configuration Sodium (Na) loses one electron to Chlorine. Thus electrovalency of Sodium is 1
Kharwil Gopiyani 7 years, 3 months ago
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Albert Einstein 7 years, 3 months ago
Mohit Singh 7 years, 3 months ago
Gaurav Seth 7 years, 3 months ago
The shortest distance between the initial position and the final position of a moving object in the given interval of time from initial to the final position of the object is known as the displacement of the object.It is a vector quantity i.e. it has both magnitude and direction.
Posted by Pratham Chanchlan8 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Gold was used by Rutherford in the alpha particle experiment as it is highly malleable. As the alpha particles are heavy, therefore their penetrating power is less. Hence to observe the results of the experiment a very thin sheet of metal was required and gold was chosen because it can be hammered into very thin sheets, and would therefore give the best results.
Posted by Abhi Grover 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
According to law of conservation of momentum
When two or more bodies acts upon each other their total momentum remains constant provided no external forces are acting
The law of conservation of energy states that energy can neither be created nor be destroyed. It may be transferred from one of its forms to the other. If you take all forms of energy into account, the total energy of an isolated system always remains constant.
Posted by Satyendra Kumar 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
All living organisms, including plants, animals, bacteria and fungi, are made up of cells. Cells are the smallest parts of all living organisms.
Cells are similar to small factories with different laborers and departments that work all the time to make life possible. Various kinds of cells perform different functions like protein synthesis and energy production.There are two major kinds of living organisms based on their cellular structure namely: prokaryotes and eukaryotes.
- Prokaryotes are made up of cells with no nucleus. They all are single-celled microorganisms including archaea, bacteria and photosynthetic blue-green algae which are also known as cyanobacteria.
- Eukaryotes consists of cells with a nucleus. This large category involves all plants, fungi (such as molds, yeast, and mushrooms), protozoa (Plasmodium falciparum and parasite that cause malaria) and animals. The plasma membrane is responsible for monitoring the transport of nutrients and electrolytes in and out of the cell and also responsible for cell to cell communication.
Posted by Aryan Singla 7 years, 3 months ago
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Gaurav Seth 7 years, 3 months ago
Law of conservation of energy states that the energy can neither be created nor destroyed but can be transformed from one form to another.
Let us now prove that the above law holds good in the case of a freely falling body.
Let a body of mass 'm' placed at a height 'h' above the ground, start falling down from rest.
In this case we have to show that the total energy (potential energy + kinetic energy) of the body A, B and C remains constant i.e, potential energy is completely transformed into kinetic energy.
Body of mass m placed at a height h
At A,
Potential energy = mgh
Kinetic energy = 0 [the velocity is zero as the object is initially at
rest]
Total energy at A = Potential energy + Kinetic energy.
Total energy at A = mgh …1
At B,
Potential energy = mgh
= mg(h - x) [Height from the ground is (h-x)]
Potential energy = mgh - mgx
Kinetic energy = ½ mv2
The body covers the distance x with a velocity v. We make use of the third equation of motion to obtain velocity of the body.
Here, u=0, a=g and s=x
Kinetic energy = mgx
Total energy at B = Potential energy + Kinetic energy
Total energy at B = mgh …2
At C,
Potential energy = m x g x 0
Potential energy = 0
Kinetic energy = ½ mv2
The freely falling body has covered the distance h.
Here, u=0, a=g and s=h
Kinetic energy = ½ mv2
Kinetic energy = mgh
Total energy at C = Potential energy + Kinetic energy
Total energy at C = mgh …3
It is clear from equations 1, 2 and 3 that the total energy of the body remains constant at every point. Thus, we conclude that law of conservation of energy holds good in the case of a freely falling body.
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Gaurav Seth 7 years, 3 months ago
An acute disease lasts for just a short time but can begin rapidly and have intense symptoms.
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