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Ask QuestionPosted by Shubhanshu Kumar 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
- Changes at Puberty:
- Increase in Height - The most conspicuous change during puberty is the sudden increase in height. At the time of puberty, the long bones (the bones of the arms and the legs) elongate and make a person tall. Initially, girls grow faster than boys but by about 18 years of age, both reach their maximum height. The rate of growth in height varies from person to person. Some boys and girls grow suddenly at puberty and then slow down, while others may grow gradually.
- Change in Body Shape – When puberty sets in, a time of rapid changes in body shape and appearance starts in boys and girls which makes them look different from one another. Changes in body shape and appearance in boys and girls brought about by the onset of puberty of puberty are as follows:Boys develop broader shoulders and wider chests than girls. Girls develop broader hips than boys.Boys develop more muscles than girls.Girls develop breasts.Boys develop Adam’s Apple which makes them look different from girls.Boys develop facial hair but the girls do not have facial hair.
Posted by Raja Yadav 7 years, 5 months ago
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Akhil Tomar 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid.
The definition of combustion means burning, or a chemical change that produces heat and light. An example of combustion is an explosion. An example of combustion is oxidation accompanied by heat and light. The products of a complete combustion reaction include carbon dioxide (CO2) and water vapor (H2O).
Posted by Nakul Agrawal 7 years, 5 months ago
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Gundu Mama 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
Liquefied petroleum gas (LPG), also referred to as simply propane or butane are flammable mixtures of hydrocarbon gases, used as fuel in heating and cooking equipment and produce a blue flame. Camphor gives a flame, which is widely used in worship. Charcoal, does not vaporise and so, does not produce a flame. Charcoal is a solid fuel. This is the reason that it can't vaporious on heating. Coal or charcoal does not produce flame when burnt because it does not vapourizes, only those substances which vapourizes on burning produce flame like wax , natural gas.
Posted by Palak Srivastava 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
This is because static charges (negative) develop when the nylon clothes are rubbed. As the amount of charge increases, the negative charges on the nylon dress tend to make a path towards the positive charges, and it results in an electrical discharge. This produces the crackling sound and sparks.
Posted by Kajal Dhiman 7 years, 5 months ago
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Khushi Nain 7 years, 5 months ago
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Aishwarya Lakshmi 7 years, 5 months ago
Posted by Rutuja Shah 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
- The disease caused due to the presence of large number of microorganisms in the food or due to the presence of toxic substances in the food formed by the action of microorganisms is called food poisoning.
- The chemicals used to check the growth of microorganisms are called preservatives. The food materials like milk, fruits, vegetables, meat, fish, cooked food, etc. get spoiled easily as they contain a lot of water due to which microorganisms can grow on them easily. We can prevent such food items by the proper methods of food preservation. The process in which the food materials are given a suitable physical or chemical treatment to prevent their spoilage is called food preservation.
Posted by Tariq Quraishi 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
Science is the study of the nature and behaviour of natural things and the knowledge that we obtain about them. ... A science is a particular branch of science such as physics, chemistry, or biology. Physics is the best example of a science which has developed strong, abstract theories. Science is the study of the nature and behavior of natural things and the knowledge that we obtain about them.
Posted by Aadarsh Navalgund 7 years, 5 months ago
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Sonali Aggarwal 7 years, 5 months ago
Fermentation is a metabolic process that consumes sugar in the absence of oxygen. The products are organic acids, gases, or alcohol. It occurs in yeast and bacteria, and also in oxygen-starved muscle cells, as in the case of lactic acid fermentation.
Posted by Ashmeet Kour 7 years, 5 months ago
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Khushi Nain 7 years, 5 months ago
Posted by Rutuja Shah 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
The food materials like milk, fruits, vegetables, meat, fish, cooked food, etc. get spoiled easily as they contain a lot of water due to which microorganisms can grow on them easily. We can prevent such food items by the proper methods of food preservation. The process in which the food materials are given a suitable physical or chemical treatment to prevent their spoilage is called food preservation.
Food Poisoning: if the food is not covered properly, stored properly or preserved properly, then it gets spoiled by the action of microorganisms. Microorganisms that grow on our food sometimes produce toxic substances. If such food is eaten, it will lead to food poisoning. Thus, food poisoning is the disease caused due to the presence of large number of microorganisms in the food or due to the presence of toxic substances in the food formed by the action of microorganisms.
Posted by Rutuja Shah 7 years, 5 months ago
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Dev Tera Yaar Jaat☢️ 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
The elongated cells or spindle are cellular structures of elongated size with diverse functions, among the main the constitution of muscular tissue. Examples are smooth muscle cells and nerve cells.
Different shapes of cells
- Spherical Cells. They are round in shape. Example - Red Blood Cells in Humans.
- Spindle Cell. They are elongated like a spindle. Example - Muscle Cell in Humans.
- Elongated Cell. They are shaped like a branch of a tree.
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Subham Singh 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
Cilia and flagella are projections from the cell. They are made up of microtubules , as shown in this cartoon and are covered by an extension of the plasma membrane. They are motile and designed either to move the cell itself or to move substances over or around the cell. Cilia and flagella are tube-like appendages which allow for motion in eukaryotic cells. ... The motion of the cilia or flagellum moves the liquid outside the cell and if the cell is not anchored, it can "swim." A commonly recognized example is the "tail" on a sperm cell, which is actually a flagellum.
Posted by Divyansh Tomar 7 years, 5 months ago
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Abhishek Kumar Sharma 7 years, 5 months ago
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Karishma Kumari 7 years, 5 months ago
1Thank You