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Briefly explain the following Term:
Disinfectants.
Disinfectants - They are strong chemical substances that are applied on spots and places where germs thrive and multiply.
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List any two major activities of the Red Cross.
Red cross has the following two major activities:
i. To extend relief and help to the victims of any calamity – flood, fire, famine, earthquake etc.
ii. To procure and supply blood for the needy victims of war or other calamities
a. The figure given below shows the epidermal cells of an onion bulb. This cell was then transferred to a drop of a sugar solution.
i. Draw a well labelled diagram of the epidermal cell as it would appear after immersion in a strong sugar solution.
ii. what is the scientific term is used for the changes as shown in (i) above?
iii. What should be done to restore the cell back to its original condition?
iv. Give the scientific term for the recovery of the cell as a result of the step taken in (iii) above
v. Define the term osmosis.
i. 
ii. Plasmolysis
iii. To restore the original condition the cell is kept in hypotonic solution so that is absorbs water.
iv. Deplasmolysis
v. Osmosis – Is the process of the movement of the solvent molecule from the region of its higher concentration to the region of its lower concentration through a semi-permeable membrane.
Briefly explain the following terms:
Guttation
Guttation is the loss of water in the form of water droplets from the hydathodes.
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