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Question
Mention whether the following statement is true (T) or false (F) and give explanation in support of your answer.
Plasmolysis is reverse of deplasmolysis.
Options
True
False
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Solution
True.
Plasmolysis occurs due to outflow of water from the cell when placed in hypertonic solution due to which the cytoplasm shrinks away from the cell wall. On the other hand, deplasmolysis is the result of the re-entry of water into the plasmolysed cell when placed in hypotonic solution due to which the protoplasm again swells up pressing tight against the cell wall.
RELATED QUESTIONS
A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:
(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?
The diagram given below represents an experimental set-up to demonstrate a certain process. Study the same and answer the questions that follow:
- Name the process.
- Define the above-named process.
- What would you observe in the experimental set-up after an hour or so?
- What control experiment can be set up for comparison?
- Keeping in mind the root hair, cell and its surroundings, name the parts that correspond to
- concentrated sugar solution
- parchment paper
- water in the beaker
- Name any other material that can be used instead of parchment paper in the above experiment.
- Mention two advantages of the process for the plants.
Name the following:
The process by which raisins swell up when placed in a beaker of water.
Choose the correct answer:
Plasmolysis will occur when the cell is placed in a __________
Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and B), the container A having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and somewhat decreased in size. Use the above information to answer the questions that follow:
Name and define the physical process being investigated in this experiment.
Give Reasons for the following.
The raisins swell up in the water.
Name the following:
The pressure through which water can rise upto some feet.
Explain the Term:
Osmosis
DPD of a cell can be expressed as ______
Name the two organelles in a plant cell that contain their own genetic material and ribosomes.
