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Ask QuestionPosted by Kamaljeet Singh 5 years, 6 months ago
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Deeksha Lingayata 5 years, 6 months ago
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Meghna Thapar 5 years, 5 months ago
Materials required:
- Tripod stand
- Beaker of about 50 to 250 mL
- Funnel
- Distilled water
- Wire gauze
- Glass rod
- Pestle and mortar
- Burner
- Filter paper
- 500 mg starch
Procedure:
- Take a mortar and add 500 mg of starch to it.
- Pour a few drops of distilled water and pestle the starch into a thin paste.
- Transfer the grinded paste to a 50 ml beaker.
- Take a 250 mL beaker and pour 100 mL of distilled water to it and heat the water to boiling.
- Slowly pour the paste into the boiling water and constantly keep stirring with the help of glass rod.
- Let it boil for 10 minutes after you have transferred all the paste into the beaker.
- Allow it to cool.
- With the help of a filter paper attached to a funnel you can filter out the contents.
- Label the filtrate as starch sol.
Posted by Pardeep Kumar 5 years, 7 months ago
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Ankita Kushwaha 5 years, 7 months ago
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Meghna Thapar 5 years, 2 months ago
Jet aeroplanes work on the principle of conservation of momentum that if initial momentum of the system was zero then final momentum of the system must also be zero. Hence the jet moves in forward direction as a result of recoil of the gases of the fuel ejaculated in the backward direction. Physical principle involved in the working of a jet plane is Newtons third law. Jet aircraft exerts a backward force on air and air exerts an equal and opposite reaction force on the jet . Due to which jet is able to move in forward direction.
Posted by Bishwa Swarup Bishi 5 years, 7 months ago
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Vanshu Lohia 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Cell Membrane
- The cell membrane supports and protects the cell. It controls the movement of substances in and out of the cells. It separates the cell from the external environment. The cell membrane is present in all the cells.
- The cell membrane is the outer covering of a cell within which all other organelles, such as the cytoplasm and nucleus, are enclosed. It is also referred to as the plasma membrane.
- By structure, it is a porous membrane (with pores) which permit the movement of selective substances in and out of the cell. Besides this, the cell membrane also protects the cellular component from damage and leakage.
- It forms the wall-like structure between two cells as well as between the cell and its surroundings.
- Plants are immobile, so their cell structures are well-adapted to protect from them from external factors. The cell wall helps to reinforce this function.
Cell Wall
- The cell wall is the most prominent part of the plant’s cell structure. It is made up of cellulose, hemicellulose and pectin.
- The cell wall is present exclusively in plant cells. It protects the plasma membrane and other cellular components. The cell wall is also the outermost layer of plant cells.
- It is a rigid and stiff structure surrounding the cell membrane.
- It provides shape and support to the cells and protects them from mechanical shocks and injuries.
Cytoplasm
- The cytoplasm is a thick, clear, jelly-like substance present inside the cell membrane.
- Most of the chemical reactions within a cell take place in this cytoplasm.
- The cell organelles such as endoplasmic reticulum, vacuoles, mitochondria, ribosomes, are suspended in this cytoplasm.
Nucleus
- The nucleus contains the hereditary material of the cell, the DNA.
- It sends signals to the cells to grow, mature, divide and die.
- The nucleus is surrounded by the nuclear envelope that separates the DNA from the rest of the cell.
- The nucleus protects the DNA and is an integral component of a plant’s cell structure.
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Shivani & Vidya Mudaraddi 5 years, 7 months ago
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Mayank Chauhan 5 years, 7 months ago
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Muhammed Shezin 5 years, 6 months ago
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Meghna Thapar 5 years, 5 months ago
Electrons are a type of subatomic particle with a negative charge. Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force. Neutrons are a type of subatomic particle with no charge (they're neutral).
Posted by Prisha Gupta 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
- The number of protons present in the nucleus of an atom is the atomic number of that atom.
- Atomic mass number is defined as the sum of the number of protons and neutrons contained in the nucleus of an atom of that element.
Posted by Shashank Dungarwal 5 years, 7 months ago
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Vanshu Lohia 5 years, 7 months ago
Danish Sharma 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
1 mole of a substance is equal to its atomic mass or molecular mass expressed in grams. The atomic mass expressed in grams is the gram atomic mass. The molecular mass expressed in grams is the gram molecular mass.
For example, The atomic mass of sodium is 23 grams.
Therefore, 23 grams of sodium is equal to one mole of sodium atoms.
Similarly, the molecular mass of oxygen (O2) = 2 × Atomic mass of oxygen
= 2 × 16
= 32 g
Avogadro experimentally found that one mole of any substance always contained 6.022 × 1023 particles.
This number is called the Avogadro’s number, denoted by N0.
Posted by Ashu Sharma 5 years, 7 months ago
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Meghna Thapar 5 years, 2 months ago
Laws protect our general safety, and ensure our rights as citizens against abuses by other people, by organizations, and by the government itself. We have laws to help provide for our general safety. These exist at the local, state and national levels, and include things like: Laws about food safety. Law is a binding custom or practice of a community: a rule of conduct or action prescribed or formally recognized as binding or enforced by a controlling authority.
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