Give scientific reasons for the following facts:
1) We gargle with saline solution in case of throat infection.
2) The resins swell up in water.
3) The grass in your lawn becomes greener if you add a little fertilizer to it but it dies if you add a lot of it.
4) When we open a perfume bottle in one corner of a room we feel the smell everywhere in the room.
5) Salt and sugars are used for preserving food.
6) Soft skinned grapes may shrink if kept in a very strong sugar solution.
7) Freshwater fish cannot survive in sea water.
8) A closed can of dried seeds bursts open if some water enters it by accident.
9) Bacteria and fungi do not grow in pickles,jams, jellies and squashes.
Give scientific reasons for the following facts:
1) We gargle with saline solution in case of throat infection.
2) The resins swell up in water.
3) The grass in your lawn becomes greener if you add a little fertilizer to it but it dies if you add a lot of it.
4) When we open a perfume bottle in one corner of a room we feel the smell everywhere in the room.
5) Salt and sugars are used for preserving food.
6) Soft skinned grapes may shrink if kept in a very strong sugar solution.
7) Freshwater fish cannot survive in sea water.
8) A closed can of dried seeds bursts open if some water enters it by accident.
9) Bacteria and fungi do not grow in pickles,jams, jellies and squashes.
The resins swell up in water.
- This is because of osmosis. Osmosis is the passage of water from a region of high water concentration to a region of low water concentration through a semi permeable membrane.
- If a medium surrounding the cell has a higher water concentration than the cell, the cell will gain water by osmosis.
Let’s apply this concept.
- The resins swell up when we put them in water and leave for some time. It is because each gains water by osmosis. Water molecules are free to pass across the cell membrane of raisin in both directions. But more water will come into the cell than leave. The net result is that water enters the raisin. The raisin likely to swell up.
Salt and sugars are used for preserving food.
- The salt and sugar used to improve taste.They reduce the water content of vegetables, fruits and meat.They also destroy some bacteria and slowing decay.They promote the growth of beneficial bacteria.
Soft skinned grapes may shrink if kept in a very strong sugar solution.
- This is also because of osmosis. Osmosis is the passage of water from a region of high water concentration to a region of low water concentration through a semi permeable membrane.
- If a medium surrounding the cell has a lower water concentration than the cell, the cell will lose water by osmosis.
Let’s apply this concept.
- Soft skinned grapes shrink if kept in a very strong sugar solution. It is because each loses water by osmosis. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. The net result is that water leaves the grapes.
- Therefore the soft skinned grapes will shrink.
- Note: We are providing solutions to some of your good queries. Try solving rest of the questions yourself and if you face any difficulty then do get back to us.
The resins swell up in water.
- This is because of osmosis. Osmosis is the passage of water from a region of high water concentration to a region of low water concentration through a semi permeable membrane.
- If a medium surrounding the cell has a higher water concentration than the cell, the cell will gain water by osmosis.
Let’s apply this concept.
- The resins swell up when we put them in water and leave for some time. It is because each gains water by osmosis. Water molecules are free to pass across the cell membrane of raisin in both directions. But more water will come into the cell than leave. The net result is that water enters the raisin. The raisin likely to swell up.
Salt and sugars are used for preserving food.
- The salt and sugar used to improve taste.They reduce the water content of vegetables, fruits and meat.They also destroy some bacteria and slowing decay.They promote the growth of beneficial bacteria.
Soft skinned grapes may shrink if kept in a very strong sugar solution.
- This is also because of osmosis. Osmosis is the passage of water from a region of high water concentration to a region of low water concentration through a semi permeable membrane.
- If a medium surrounding the cell has a lower water concentration than the cell, the cell will lose water by osmosis.
Let’s apply this concept.
- Soft skinned grapes shrink if kept in a very strong sugar solution. It is because each loses water by osmosis. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. The net result is that water leaves the grapes.
- Therefore the soft skinned grapes will shrink.
- Note: We are providing solutions to some of your good queries. Try solving rest of the questions yourself and if you face any difficulty then do get back to us.
