Isotonic, Hypotonic Solutions, Hypertonic Solutions

Q.

What will happen if we put an animal cell into a sugar or salt solution?

Q.

Explain plasmolysis in a plant cell. Draw a diagram showing stages in plasmolysis?

Q. Detergent is used to break open the cell membrane. How does detergent aid in this process?

1. Detergent dissolves the cell membrane because of its alkalinity
2. Cell membrane reacts with the acidic detergent and is dissolved in it
3. Detergent breaks the cell membrane after binding to the hydrophobic lipid tails
4. Detergent can make holes in the cell membrane for the DNA to come out

Q.

Differentiate between the following:

(a) Plasmolysis and deplasmolysis

(b) Turgor pressure and wall pressure

(c) Guttation and bleeding

(d) Turgidity and Flaccidity

Q.

Complete the following statements:

(a) Hypotonic solution is one in which the solution kept outside the cell has a lower solute concentration than .............................. the cell.

(b) Active transport is one in which the ions outside the roots move in with expenditure of energy ..............................

(c) The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ..............................

Q.

Why is it necessary to maintain a normal osmotic concentration of the blood?

Q.

What happens to a cell as it is placed in a hypertonic solution?

Q.

A fully distended cell is known as ______.

(flaccid/turgid)

Q.

Mention whether the following statements are true (T) or false (F) and give explanation in support of your answer.

(a) Plasmolysis is reverse of deplasmolysis. (T/F)

(b) Guttation is another name for bleeding in plants. (T/F)

(c) Soaked seeds burst their seed coats. (T/F)

(d) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt. (T/F)

(e) Guttation in plants occurs maximum at mid-day. (T/F)

(f) Dry seeds when submerged in water swell up due to endosmosis. (T/F)

Q.

What is the sugar concentration theory? Explain in easy language.

Q.

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.

(a) Give the technical terms of the solutions used in beakers, 1, 2 and 3.

(b) In beaker 3 the size of the potato cube remains the same. Explain the reason in brief.

(c) Write the specific feature of the cell sap of root hairs which helps in the absorption of water.

(d) What is osmosis?

(e) How do a cell wall and a cell membrane differ in their permeability?

Q.

(a) Mention whether the following statements are true(T) or false (F).

(i) A plant cell placed in hypotonic solution gets plasmolysed. (T/F)

(ii) Addition of salt to pickles prevents the growth of bacteria because they turn turgid. (T/F)

(iii) Cells that have lost their water content are said to be deplasmolysed. (T/F)

(iv) Xylem is the water-conducting tissue in plants. (T/F)

Q.

Explain an activity to demonstrate plasmolysis in Rheo leaf.

Q. Plasmolysis will occur when the cell is placed in a
(a) hypotonic solution
(b) isotonic solution
(c) hypertonic solution
(d) acidic solution

Q.

If a cell shrinks when placed in a solution, what will be the tonicity of the solution when compared to cell solution?

1. Cannot determine

2. Isotonic

3. Hypotonic

4. Hypertonic

Q.

Give two advantages of plasmolysis.

Q.

The space between the cell wall and plasma membrane in a plasmolysed cell is filled with

(a) isotonic solution (b) hypotonic solution

(c) hypertonic solution (d) water

Q.

Solutions A and B are separated by a semi-permeable membrane and water moves from A to B. Hence, solution B is

1. Hypertonic

2. Isotonic

3. Hypotonic

4. None of the above

Q.

What is the difference between flaccidity and plasmolysis?

Q.

A plant cell placed in a certain solution got plasmolysed. What was the kind of solution?

(a) Isotonic sugar solution (b) Hypotonic salt solution

(c) Hypertonic salt solution (d) Isotonic salt solution

Q.

Do animal cells have lysosomes?

Q.

A plant cell placed in a certain solution got plasmolysed. What was the kind of solution?

(a) Isotonic sugar solution (b) Hypotonic salt solution

(c) Hypertonic salt solution (d) Isotonic salt solution

Q.

What is the utility of plasmolysis ?

Q.

The cell wall is the most rigid component of the cell.

1. True

2. False

Q.

Which organelles contain hydrolytic enzymes?

Q.

The cell wall is not involved in

1. absorption

2. secretion
   

3. osmoregulation

4. translocation
   

Q.

What will happen if we put an animal cell into a sugar or salt solution?

1. Cell shrinks

2. Cell swells

3. None of these

4. Cell bursts

Q. If a marine plant is transferred to fresh water, it bursts due to
(a) exosmosis
(b) endomosis
(c) plasmolysis
(d) diffusion

Q.

Give the biological/technical term for the following:

(c) The phenomenon by which living or dead plant cells absorb water by surface attraction.

Q. What will happen if a cell contains higher water concentration than the surrounding medium?

1. Exosmosis
2. Plasmolysis
3. Diffusion
4. Facilitated diffusion