Diffusion, Osmosis and Transpiration

1. A plant cell's turgidity, which keeps its stem and leaves fresh and straight, is maintained primarily by which process?

• A) Diffusion of gases
• B) Transpiration from the leaves
• C) Osmosis causing water to enter the cells
• D) Imbibition by the cell wall

2. What is the process called where molecules move from a region of higher concentration to one of lower concentration until they are equally distributed?

• A) Osmosis
• B) Transpiration
• C) Diffusion
• D) Imbibition

3. Through which vascular tissue is water transported upwards from the root to the leaves?

• A) Phloem
• B) Xylem
• C) Cuticle
• D) Stomata

4. Why is transpiration often described as a 'necessary evil' for plants?

• A) It only occurs at night, which is inefficient.
• B) It is essential for processes like water transport but can be harmful if the rate is too high.
• C) It releases harmful gases into the atmosphere.
• D) It consumes all the food produced by photosynthesis.

5. According to the text, which of the following is an example of a permeable membrane?

• A) Polythene
• B) Cell membrane
• C) Cell wall
• D) Membrane of fish potka

6. Which type of membrane allows only solvent molecules to pass through but not solute molecules?

• A) Permeable membrane
• B) Semi-permeable membrane
• C) Impermeable membrane
• D) Cell wall

7. What is the physiological process where plants lose water in the form of vapor from their aerial parts?

• A) Absorption
• B) Photosynthesis
• C) Respiration
• D) Transpiration