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The amount of heat produced by burning a unit mass of the fuel completely is known as its calorific value. The unit of mass usually taken for measuring the calorific value of a fuel is “gram”. The amount of heat produced by burning 1 gram of a fuel completely is called its calorific value
Posted by Harsh Varman 5 years ago
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Gaurav Seth 5 years ago
Iris
Iris is the ring of pigmented tissue surrounding the pupil that varies in color from person to person, it contract and dilates to control the amount of light entering the eye through the pupil. The pupil is the opening in the center of the iris where light enters the eye.
Posted by Kumari Shalini 5 years ago
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Gaurav Seth 5 years ago
Copper is a reactive metal. In a process called oxidation, copper reacts slowly in the presence of oxygen, resulting in copper oxide. This is what we call tarnish, which is generally perceived as a brown or black coloration on the surface. Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate.
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10 Science notes Chapter 6 Life Processes
Download CBSE class 10th revision notes for Chapter 6 Life Processes in PDF format for free. Download revision notes for Life Processes class 10 Notes and score high in exams. These are the Life Processes class 10 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.
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Posted by Keerthana Lokesh 5 years ago
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Gaurav Seth 5 years ago
a) The colour of ferrous sulphate is green. It changes to brown after heating.
On heating: FeSO4.7H2O→FeSO4(s)+7H2O(g)
b) The product formed is ferric oxide (Fe2O3). This is a decomposition reaction.
On strong heating: 2FeSO4(s)→Fe2O3(s)+SO2(g)+SO3(g)
Posted by Anshika Singh 5 years ago
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Incomplete dominance: When none of the factors of a gene is dominant, the phenotype of a heterozygous dominant individual is a blend of dominant and recessive traits. For example, flower colour in<i> Mirabilis jalapa.</i>
Co-dominance: When both recessive and dominant traits are expressed in a heterozygous genotype. This means that none of the factors is recessive but both can express themselves irrespective of their presence in homozygous or heterozygous condition. For example, IA and IB alleles of I gene of ABO blood group.
Posted by Francis Lalu 5 years ago
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Posted by B.A. Barath 5 years ago
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Yogita Ingle 5 years ago
Acid rain water, if mixed with river water, lowers its pH below 5.6, i.e., makes river water acidic. But the living body works normally within a pH range of 7-7.8. That's why flow of acid rain water to river makes the survival of aquatic life in the river difficult.
Posted by Ganesh Deshmukh 5 years ago
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Yogita Ingle 5 years ago
The conversion of vegetable oil to vegetable ghee is called hydrogenation reaction.
Posted by Ishika Kumari 5 years ago
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Yogita Ingle 5 years ago
Only one triad of Dobereiner's triads exists in the columns of Newlands' octaves. The triad formed by the elements Li, Na, and K of Dobereiner's triads also occurred in the columns of Newlands' octaves.
Posted by Ishika Kumari 5 years ago
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Yogita Ingle 5 years ago
Hard water often contains salts of calcium and magnesium. Soap molecules react with the salts of calcium and magnesium and form a precipitate. This precipitate begins floating as an off-white layer over water. This layer is called scum. Soaps lose their cleansing property in hard water because of formation of scum.
Posted by Ishika Kumari 5 years ago
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Yogita Ingle 5 years ago
Carbon and its compounds are used as fuels due to following reasons-
1.They give large amount of heat on combustion due to high percentage of carbon and hydrogen.
2.Carbon compounds used as fuel have optimum ignition temperature with high calorific values and are easy to handle.
3.Their combustion can be controlled. Therefore, carbon and its compounds are used as fuels
Posted by Divyansh Bibhor 5 years ago
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Yogita Ingle 5 years ago
SINGLE CIRCULATION
A circulatory system in which blood travels only once through the heart in one complete cycle of the body is called single circulation. It occurs in fish.
DOUBLE CIRCULATION
A circulatory system in which blood travels twice through the heart in one complete cycle of the body is called double circulation. It occurs in mammals.
Posted by Saniya Khan 5 years ago
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Gaurav Seth 5 years ago
Amoeba envelops its food through the process of endocytosis or phagocytosis, where pseudopodia is created by flexibility of the plasma membrane.
The pseudopodia is the temporary arm-like projection in amoeba that helps collect the nutrition, alter its size and shape and acts as an organ of locomotion.
Amoeba takes in food using temporary finger-like extensions of the cell surface which fuse over the food particle forming a food-vacuole. Inside the food vacuole, complex substances are broken down into simpler ones which then diffuse into the cytoplasm. The remaining undigested material is moved to the surface of the cell and thrown out. The complete phagocytosis process includes intake, digestion , absorption, assimilation, and egestion process.
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An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.
Posted by Digvijay Vishwakarma 5 years ago
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Yogita Ingle 5 years ago
A universal indicator is basically a pH indicator of a solution of several compounds. This solution of universal indicator exhibits several colour changes from the range of 1-14 in the pH scale. This pH indicator indicates the acidity or basicity of the solution.
Posted by Nadim Sarbar 5 years ago
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Yogita Ingle 5 years ago
The sine of the critical angle is the ratio of refractive index of medium 2 to that in medium 1. Thus sin θc = n2/n1.
To get θc, put n1 = 2 and n2 = 1. Thus we get θc = sin-1(n2/n1) = sin-1(1/2) = 30 degree.
Posted by Yanshu Parjapati 5 years ago
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Functions of placenta
- The placenta is the passage that unites the fetus to the mother.
- Transmission of nutrients and oxygen from mother to the fetus and the release of carbon dioxide and waste materials from the fetus takes place through the placenta.
Posted by Diya Rajput 5 years ago
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Geothermal energy is the thermal energy generated and stored inside the Earth’s crust. The center of the Earth remains at the same temperature as the Sun which is nearly constant due to the continuous process of nuclear fusion. Due to such high temperature and pressure some rocks melt, which results in the upward motion of the mantle (as they become lighter with the heat). These molten rocks formed in the Earth’s crust are pushed upward where they get trapped in certain regions called ‘hot spots’. When underground water comes in contact with the hot spot, steam is generated. Sometimes this hot water formed region finds outlets at the surface. When this hot water gushes out of one of these outlets, it is called hot springs.
Posted by Subham Das 5 years ago
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Posted by Super Hooda.Gaming 5 years ago
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Gaurav Seth 5 years ago
Advantages :
1}These are the main source of power generation.
2}These projects control the floods because water can be stored in them. These projects have converted many, 'rivers of sorrows' into 'rivers of boon'.
3}Thes projects are the main source of irrigation and also help in conserving soil.
Disadvantages:
1}Dams also fragment rivers making it difficult for aquatic fauna to migrate for spawning, i.e , to produce eggs.
2}It resulted in displacement of local communities.
3}The multipurpose projects induced earthquake, caused waterborne diseases......
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Tanisha Bharti 5 years ago
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