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Answers
Explanation:
woman starts from her house at 9.00 am, walks with a speed of 5 km/hr on a straight road upto ner office 5 km away, stays at the office up to 5.00 pm, and returns home by an auto at a speed of 30 km/hr. Choose suitable scales and plot the x-t graph of her motion.
Answer:
Ans.
1.
Osmosis is the movement of solvent from a region of lower solute concentration to a region of higher solute concentration through a semi-permeable membrane.
2.
If the plasma membrane ruptures or breaks down then the cell will not be able to exchange material from its surrounding by diffusion or osmosis.
3.
The substances like CO2 and water move in and out of a cell by diffusion from the region of high concentration to low concentration. When the concentration of CO2 and water is higher in external environment than that inside the cell, CO2 and water moves inside the cell.
5.
The cell is known as the structural and functional unit of life because all living beings are formed of cells.
6.
The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope.