Osmosis

Q.

The diagram given below represents an experimental set-up to demonstrate a certain process. Study the same and answer the questions that follow:

(a) Name the process:

(b) Define the above-named process.

(c) What would you deserve in the experimental set-up after an hour or so?

(d) What control experiment can be set up for comparison?

(e) Keeping in mind the root-hair, cell and its surroundings, name the parts that correspond to

(1) concentrated sugar solution (2) parchment paper and (3) water in the beaker.

(f) Name any other substance that can be used instead of parchment paper in the above experiment.

(g) Mention two advantages of this process to the plants.

Q.

List the factors that affect absorption of water in plants.

Q.

What is the osmotic potential of pure water?

Q.

If a stomata closes at night then where does the diffusion of gas occur through , that is how does the plant respire?

Q. What is imbibition? Explain with examples.

Q.

Is osmosis active or passive transport?

Q.

How do the water enters through the root hair ?

Q.

What is meant by suction pressure?

Q.

Water enters the root hair by the process of ________.

Q.

What would happen if we kept a fresh grape in concentrated salt water solution?

1. Grape bursts open

2. No change observed

3. Grape shrinks

4. Shrinks and then bursts open

Q.

Marine fish when placed in tap water burst and die because of

1. endosmosis
   

2. plasmolysis

3. diffusion
   

4. exosmosis
   

Q.

Give a suitable explanation for the following:

Grapes shrink when immersed in a very strong sugar solution.

Q.

Two potato cubes each 1 $c{m}^3$ in size, were placed separately in two containers (A & 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 had somewhat decreased in size. Use the above information to answer the questions that follow:

(a) Account for the firmness and increase in the size of the potato cubes placed in water.

(b) Accounts for the softness and decrease in the size of the potato cubes which were placed in sugar solution.

(c) Name and define the physical process being investigated in this experiment.

Q.

Study the experimental set up in the figure and then answer the questions that follow:

(a) What phenomenon is being studied by this setup?

(b) Explain the phenomenon mentioned in (a) above

(c) What is meant by 'semipermeable membrane'?

(d) What will you deserve in the set up after about half an hour? Give a reason for your answer.

Q. During osmosis, the water molecules will keep moving across the semi-permeable membrane till a/an is reached.

1. lower concentration
2. equilibrium
3. higher concentration

Q.

Gaseous exchange in plants takes place through _________ and _________ .

Q.

Given below is the diagram of an apparatus setup to study a very important physiological process:

(i) Name the process being studied.

(ii) Explain the process.

(iii) What change would you observe in the thistle funnel containing sugar solution after about 10 minutes?

(iv) Is sugar solution hypertonic or hypotonic?

(v) Name the part of the plant cell which is represented by the sugar solution.

Q.

The process by which raisins swell up when placed in a beaker of water.

Q.

How is osmosis different from facilitated diffusion?

Q.

RBC and a plant cell (with thick cell wall) are placed in distilled water. The solute concentration is the same in both the cells. What changes would be observed in them?

1. Both plant cell and RBC would not undergo any change

2. The RBC would increase in size and burst, while the plant cell would remain about the same size

3. The plant cell would increase in size and burst, while the RBC would remain about the same size

4. Bothe plant cell and RBC would decrease in size and collapse

Q.

Which of the following statements are true regarding osmosis?

1. It is a quick process

2. It can only transport water over short distances

3. A semipermeable membrane is required

4. Water moves from high concentration to low concentration

Q.

Until when does water move from its region of higher chemical potential to that of its lower?

Q.

_________ is the flow of water molecules from the region of higher water potential to the region of lower water potential through semi permeable membrane.

Q. The difference in the concentration of solutes in cell sap inside the roots and the soil water triggersand movement of water into the roots

1. diffusion
2. osmosis
3. active transport

Q.

Does pure water have the greatest water potential?

Q.

Water enters plants by

1. cohesive force

2. osmosis

3. guttation
   

4. imbibition

Q.

Osmosis is the movement of solvent through a:

1. Semipermeable membrane

2. Impermeable membrane

3. Permeable membrane

4. Synthetic membrane

Q. is the inward movement of water through a semi-permeable membrane when the surrounding solution is less concentrated than the cytoplasm.

1. Endosmosis
2. Exosmosis
3. Diffusion
4. Active transport

Q.

Consider a raw potato that has been carved out, and placed within a petri dish as shown in the figure below. The scooped out part of the potato contains 40% sugar solution and the petri dish contains 20% sugar solution.

What will happen to the level of the 40% sugar solution within the potato? What process is involved here?

1. The level will fall because of osmosis

2. The level will rise because of osmosis

3. The level will fall because of diffusion

4. The level will rise because of diffusion

Q.

Diffusion of gases in plants occurs through

1. stomata

2. lenticels

3. intercellular spaces

4. all of the above