Q1. What are porins? What role do they play in diffusion?

Q2. Define water potential. What is the value of water potential of pure water?

Q3. Differentiate osmosis from diffusion.

Q4. What are apoplast and symplast?

Q5. How does guttation differ from transpiration?

Q6. What are the physical properties of water responsible for the ascent of sap through xylem in plants?

Q7. With reference to transportation of food within a plant, what are source and sink?

Q8. Does transpiration occur at night? Give an example.

Q9. Compare the pH of guard cells during the opening and closing of stomata.

Q10. In the wake of transpirational loss, why do the C, plants are more efficient than C, plants?

Q11. What is meant by transport saturation? How does it influence facilitated diffusion?

Q12. How does ABA bring about the closure of stomata under water stress conditions?

Q13. Compare imbibing capacities of pea and wheat seeds.

Q1. Define and explain water potential.

Q2. Write short notes on facilitated diffusion.

Q3. What is meant by plasmolysis? How is it practically useful to us?

Q4. How does ascent of sap occur in tall tress?

Q5. Explain pressure flow hypothesis of translocation of sugars in plants.

Q6. Transpiration is a necessary evil. Explain.

Q7. Transpiration and Photosynthesis - a compromise. Explain.

Q8. Explain the mechanism of opening and closing of stomata.

Q1. Differentiate uphill and downhill transport.

Q2. Compare facilitated diffusion and simple diffusion.

Q3. What happens when two solutions of different concentrations are separated by egg membrane? State the reason.

Q4. In general in a plant which path of water movement is more and why?

Q5. Why Pirus seeds fail to germinate in the absence of mycorrhizae?

Q6. Why do stomata close under water stress conditions?

Q7. How are stomata distributed in a typical monocot plant?

Q8. In what form the sugars are transported through phloem?

Q9. Why does the root endodermis transports ions in one direction only?

Q10. If a ring of bark is removed from an actively growing plant, what will happen and why?