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Quiz On Heat, sound and light (Physics) Part 1

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Cell-Structure and functions......... Concept Basic Definition Points CBDP

December 15, 2021

Cell is the basic fundamental and structural unit of life. All living organisms areade up of one or more cells. Microscope is an instrument used to see objects which are too small to be seen through our Naked eyes. Cells are highly organised and all their functions an regulated. It is not just the rate of cell division that is controlled, but also the rate of cell death. If cells are longer needed, they commit suicide by activating an intracellular death program. This process is called programmed cell death or apoptosis. Robert Hooke in 1665 observed the slices of cork under a microscope, he coined the name as cell . Anton Van Leeuwenhook invented microscope Mathias Schleiden proposed that all plants are made up of cells. Cell theory was proposed by Schleiden and Schwann. The main postulates of cell theory are: • All living organisms are composed of one or more cells. • Cell is the basic unit of structure, function, and organisation in all organisms. • Al...

What is cell Theory, What makes plants appear green, what is a vacuole, what are unicellular organisms........ask why

December 16, 2021

Q) What Makes plants appear green? Ans- Plants appear green due to the presence of a pigment called chlorophyll. There are high concentrations of chlorohyll in chloroplasts. These plastids are responsible for photosynthesis. Q) What is a vacuole? Ans- The vacuole is the cell organelle that stores excess. water and gives support and rigidity to a plant cell. It occupies about 80% of the plant cell volume. Q) What is cell theory ? Ans- The main postulates of cell theory are: • All living organisms are composed of one or more cells. • Cell is the basic unit of structure, function, and organisation in all organisms. • All cells come from pre-existing, living cells. • All living cells do not have cell walls. It is present only in plants, fungi and bacteria. Q) What are unicellular organisms? Ans-Unicellular organisms are made up of just a single cell. All basic functions that are required to sustain life such as growth, repair and division are all carried out by that ...

Distance and displacement......... Physics, Laws of motion

December 26, 2021

Distance is the path covered by the body Distance is a scalar quantity It is dependent on path followed by object Displacement is the shortest distance covered by the body It is a vector quantity It is independent on the path followed by the object Displacement is defined as the change in position of an object ∆x = X initial — X final ∆x = Xi — Xf # When final position is equal to the initial position we say displacement is zero Distance ≥ Displacement Created and edited by Sai Group Sai Group In case of any doubt frankly ask in comments, I will try to answer Viewer's now you can also ask questions and also answer questions, follow Sai Group Happy learning Thank you

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