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प्रश्न
Explain why:
Bacteria and fungi do not grow in pickles, jams, jellies and squashes.
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उत्तर
Jam, jellies and pickles are kept in hypertonic solution of sugar or salt in which plasmolysis of bacteria and fungi takes place. This kills the bacteria and fungi and hence, pickles, jam and jellies are preserved properly.
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संबंधित प्रश्न
Osmosis and diffusion are the same except that osmosis there is:
Name the following:
Movement of molecules from a region of high concentration to a region of low concentration.
Choose the correct answer:
Osmosis involves diffusion of ___________
Choose the correct answer:
Grapes when placed in a strong sugar solution shrink because of __________
The diagram below represents an experimental set up to demonstrate a vital process. Study the same and then answer the questions that follow:
(i) Name the process.
(ii) Define the above named process.
(iii) What would you observe in the experimental setup after an hour or so?
(iv) What control experiment can be set up for the above experiment?
(v) Keeping in mind the root hair cell and its surrounding name the part that corresponds to (1) Concentrated sugar solution, (2) Parchment paper, (3) Water in the beaker.
(vi) Name any other substance that can be used instead of parchment paper in the above experiment.
(vii) Mention two advantages of this process to the plant.
Give Technical Term for the following.
A solution whose concentration is equal to the cell sap.
Fill in the Blank
Raisin swells up when kept in a __________ solution.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Osmosis is defined as the movement of water from a concentrated sugar solution to a dilute sugar solution.
Multiple Choice Question:
Plasma membrane controls:
When a cell in solution shrinks and loses its shape, then the solution is ______.
