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Dude ? 7 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Characteristics of Meristematic Tissues:
- Their cells are similar in structure and have thin cellulose cell walls.
- The cells are active and have dense cytoplasm and prominent nucleus because they are actively dividing cells.
- They contain few vacuoles or no vacuoles at all.
- The meristematic cells are compactly arranged and do not contain any intercellular space between them.
Posted by Ha Mohammed Uvez Khan 7 years, 1 month ago
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Posted by Sujal Kulhari 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Soil is formed through the process of weathering. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate. As a result of these processes, large rock pieces are converted into smaller pieces and eventually to soil.
Posted by Biswa Ranjan Bagarty 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
First heat it in a closed beaker and collect the vapours through a delivery tube in a jar. Ammonium chloride sublimes and then the vapours condense to give solid ammonium chloride in the jar. Thus one of the constituents is separated.
Now, add water in the beaker. The salt will dissolve. Pass the solution through a filter paper into another beaker. The salt solution passes in and the sand is collected on the filter paper.
Now heat the salt solution. The water will evaporate leaving behind the salt as residue.
Thus all the constituents of the mixture are separated.
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Yogita Ingle 7 years, 1 month ago
Molar mass: The molar mass is the mass of one mole (or 6.023 X 1023) particles of that substance. The molar mass of an element is equal to the numerical value of the atomic mass. However, in case of molar mass, the units change from ‘u’ to ‘g’. The molar mass of an atom is also known as gram atomic mass.
For example mass of 6.023 X 1023 atoms of sodium or molar mass of sodium is 23g, but its atomic mass is 23u
Nikhil Chavan 7 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Characteristics of Bryophyta:
(i) Bryophytes are small multicellular green land plants. These simple land plants are confined to shady damp places.
(ii) A true vascular system is absent in them.
(iii) The *** organs are multicellular.
(iv) An embryo is formed upon fertilisation.
Example: Riccia and Marchantia.
Posted by Aman Diwedi 7 years, 1 month ago
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Gaurav Seth 7 years, 1 month ago
When the train passes over a railway track, the whole weight of the train acts on the railway line beneath it. Due to large sized concrete sleepers, the force of this weight spreads out over a large area, thereby reducing the pressure on the ground. As a result, the railway track can bear it.
Posted by Jay Joshi 7 years, 1 month ago
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Dhruv Pandey 7 years, 1 month ago
Yogita Ingle 7 years, 1 month ago
The waves which require a material medium for their propagation are called mechanical waves. The propagation of mechanical waves depend upon the elastic propertie so the medium. Hence, they are also called elastic waves.
Examples of mechanical waves :
(i) Sound waves in air.
(ii) Waves over water surface.
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Yogita Ingle 7 years, 1 month ago
Isotopes: The atoms which posses same atomic number (the atoms same element) but different mass number are called Isotopes.
Ex: ₁H¹,₁H², ₁H³
These are the isotopes of Hydrogen.
The difference in mass number is due to different number of neutrons present in the nucleus.
Isobars: The atoms which posses different atomic number with same mass number are called Isobars.
Ex : ₁₈Ar⁴⁰,₂₀Ca⁴⁰
Narendra Mishra 7 years, 1 month ago
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