Fundamental Unit of life
Question 1. Vasu was helping his mother in laying the table when they had some guest for dinner. Vasu
was about to sprinkle salt on salad for dressing. His mother stopped him from doing so and told him that
It is too early to sprinkle salt on the salad, he should do so only when they are seated for having the dinner.
(a) What would happen if salt is sprinkled on the salad?
(b) Which property of cells is seen in adding salt to it?
(c) What value of Vasu is seen?
Question 2. Anu is a five year old girl who joined the swimming classes. After the first class she was
worried when she saw her wrinkled fingers. She asked her elder sister about the wrinkling and shrinking of
her fingers. Her sister explained Anu why it was so.
(a) Why did the fingers wrinkle after swimming?
(b) What caused the shrinking/wrinkling of fingers?
(c) What value of Anu is seen in the above cast?
Question 3. Two sailors got marooned on the island, both of them were very thirsty and one of the sailors
tried to drink sea water. The other sailor immediately stopped him from drinking the salty water of sea and
suggested to wait for some help, stay calm and patient.
(a) What would happen if the sailor drinks salty water?
(b) What is osmosis?
(c) What value of sailors is reflected in the above act?
Answers
Answer:
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Explanation:
I know only 1 answer that what is osmosis
Osmosis (/ɒzˈmoʊ. sɪs/) is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides.
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Answer:
1) a) On sprinkling of some salt on the salad, the salad will release water.
b) The salt outside the salad acts as hypertonic solution as it has less water concentration and therefore the cell looses water by osmosis.
c) Vasu showed the value of being very helpful, caring and responsible.
2) a) Fingers wrinkled because the cells of the skin lost some water.
b) This happened because of the difference in the concentration of water in the skin cells and swimming pool's water.
c) Anu showed the value of aware citizen and a good learner who clarifies the doubts.
3) a) On drinking salty water, exmosis in the intesine will cause dehydration and vomitting.
b) The movement of water molecules through a permeable membrane is called osmosis
c) Sailors showed the value of being patient, composed, empathy and determination.
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