Class 11 Biology - Chapter Transport in Plants NCERT Solutions | What are porins? What role do they play
What are porins? What role do they play in diffusion?
Porins are types of proteins which form pores of large sizes in the outer membranes of plastids such as chloroplast, mitochondria and the membranes in bacteria. They help in facilitating the passive transport of small-sized protein molecules.
More Questions From Class 11 Biology - Chapter Transport in Plants
- Q:- Explain why xylem transport is unidirectional and phloem transport bi-directional.
- Q:- (a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples.
(b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential. - Q:- What role does root pressure play in water movement in plants?
- Q:- What are the factors affecting the rate of diffusion?
- Q:- Explain pressure flow hypothesis of translocation of sugars in plants.
- Q:- Explain why pure water has the maximum water potential.Explain why pure water has the maximum water potential.
- Q:- Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?
- Q:- Briefly describe water potential. What are the factors affecting it?
- Q:- What causes the opening and closing of guard cells of stomata during transpiration?
- Q:- How is the mycorrhizal association helpful in absorption of water and minerals in plants?
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Porins are proteins lined hydrophilic channels present in the outer membrane of plastids, mitochondria & some bacteria. They allow passage of large bio molecules, even small sized proteins as per diffusion gradient. Aqua potions are water channels for diffusion of water molecules across the plasma membrane as per osmotic gradients.
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