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Ask QuestionPosted by Hukum Chand 5 years, 8 months ago
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Posted by Bandana Sah 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Newton's third law explains the generation of thrust by a rocket engine. In a rocket engine, hot exhaust gas is produced through the combustion of a fuel with an oxidizer.
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Posted by Ch Nikhil Kasana 5 years, 8 months ago
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The muscular energy of the cyclist is converted into kinetic energy (rotational) of the pedals of the bicycle which is transferred to its wheels. The kinetic energy of the rotation of the wheels is converted into the kinetic energy of the bicycle and the cyclist.
Posted by Divyanshu Runthla 5 years, 8 months ago
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Posted by Myself Viv 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months ago
Plasma membrane: The outer boundary of the cell is called the plasma membrane. The cytoplasm lies inside it. It is a living, thin, delicate, elastic, selectively permeable membrane.
Functions:
- It separates the contents of the cell from its external environment.
- The plasma membrane allows or permits the entry and exit of some materials in and out of the cell.
- It also prevents movement of some other materials.
Cell wall: Plant cells, in addition to the plasma membrane, have another rigid outer covering called the cell wall. It lies outside the plasma membrane.
Functions of cell wall:
- It permits the plant cell to become turgid.
- It provides mechanical strength to support the cell.
- It is freely permeable to water and substances in solution.
- Cell wall permits the cells of plants, fungi and bacteria to withstand very dilute (hypotonic) external media without bursting.
Posted by Bandana Sah 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months ago
The nucleus contains chromosomes, which are visible as rod-shaped structures only when the cell is about to divide. Chromosomes contain information for inheritance of features from parents to next generation in the form of DNA (Deoxyribo Nucleic Acid) molecules. Chromosomes are composed of DNA and protein. DNA molecules contain the information necessary for constructing and organising cells. Functional segments of DNA are called genes. Thus, genes are the functional units of chromosomes which transmit the heredity information from parents to offsprings. These are located on chromosomes.
Posted by Deepak Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The law of conservation of energy states that energy can neither be created nor be destroyed. Although, it may be transformed from one form to another. If you take all forms of energy into account, the total energy of an isolated system always remains constant. All the forms of energy follow the law of conservation of energy.
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Posted by Khushi Sharma 5 years, 8 months ago
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The information given about the element is 19×9. It means that 19 is the atomic mass whereas 9 is the atomic number of the element.
The element with atomic number 9 is fluorine. The number of sub-atomic particles present in Fluorine is as follows:
Number of Protons = Number of Electrons = Atomic number
∴ Atomic number of Fluorine = 9
Number of protons = 9
Number of Electrons = 9
Number of neuton = Mass number - Atomic number
∴ Mass number of Fluorine = 19, Atomic number =9
Number of neutron = 19 - 9 = 10
As fluorine has 9 electron, the electronic distribution is 2,7. There are seven valence electron present in the outermost shell.
As valence electron is above 4, therefore valency is 1 (Valency = 8-valence electron).
Conclusion:
Number of electrons = 9
Number of protons = 9
Number of Neutrons = 10
Valency of the element = 1
Posted by _Sumitz_ Sumittt 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months ago
The type of treatment of a disease depends on the category of the infectious agent.
Members of each one of these groups have many common biological characteristics. For example - all viruses live inside host cells, whereas bacteria very rarely do. Viruses, bacteria and fungi multiply very quickly, while worms multiply very slowly in comparison. Taxonomically, all bacteria are closely related to each other than to viruses and vice versa.
This means that many important life processes are similar in the bacteria group but are not shared with the virus group. As a result, drugs that block one of these life processes in one member of the group is likely to be effective against many other members of the group. But the same drug will not work against a microbe belonging to a different group. Example antibiotics block biochemical pathways important for bacteria. Many bacteria, for example, make a cell-wall to protect themselves. The antibiotic penicillin blocks the bacterial processes that build the cell-wall. As a result, the growing bacteria become unable to make cell-walls, and die easily.
But viruses do not use these pathways at all, and that is the reason why antibiotics do not work against viral infections. If we have a common cold, taking antibiotics does not reduce the severity or the duration of the disease. However, if we also get a bacterial infection along with the viral cold, taking antibiotics will help.
Posted by Ravichandran Jairam 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Cattle farming is done for two purposes:
Dairy: for getting milk.
Draught: animals are used for agricultural tasks like tilling, irrigation and carting.
On the above basis, the cattle are divided into two categories:
Milch breeds (dairy animals): These include the animals which are kept for obtaining milk. Indian milch cattle belong to two different species- Cows (Bos indicus) and Buffaloes (Bos bubalis).
Draught animals: These animals are used in agriculture and transportation.
Posted by Gaming With Shivam 5 years, 8 months ago
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Solid: Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium.
Properties of solids
- Solid has fixed volume.
- Solid has fixed shape.
- Solid has high density.
- Solids are heavy.
- Solid does not flow.
Posted by Ruchi Bansal 5 years, 8 months ago
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Atomic mass refers to the mass of an atom. It depicts how many times an atom of an element is heavier than one-twelth (1/12th) the mass of one atom of carbon-12 of mass of one carbon atom. The relative atomic masses of all elements have been established with reverence to an atom of carbon-12. It is measured in unit called amu (atomic mass unit). 1/12 of the mass of one atom of carbon is termed as relative atomic mass. It doesnot possess a unit.
Mathematically,
mass of one atom of an element = atomic mass X (1/12th) of the mass of one atom of carbon.
Posted by Pratiksha Kavra 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months ago
The molecular formula of a compound has a quantitative significance. It represents the following:
(1) The name of the substance.
(2) Both, the molecule and the molecular mass of the compound.
(3) The respective numbers of different atoms present in one molecule of a compound.
(4) The ratios of the respective masses of the elements present in the compound.
However, the formula unit mass of a substance is the sum of the atomic masses of all the atoms in a formula unit of a compound.
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