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Transport in Plants
Question
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What are porins ? What role do they play in diffusion ?

Answer

Porins : These are special proteins having large pores and are present in outer membrane of plastids, mitochondria and some bacteria. These allow molecules to pass even upto size of small proteins Thus moelcules can diffuse through them. They help in facillitated diffusion. 

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Some More Questions From Transport in Plants Chapter

Give the term for the ability to resist a pulling force.

Who introduced the apoplast—symplast concept ?

Why transpiration is more on lower surface than on upper surface of leaves ?

Give the term for the ability to rise in thin tubes. 

What is capillarity ?

Name the two forces responsible for the rise of water in a capillary tube.

Which force is first operative in translocation of water through capillarity : cohesive force or adhesive force ?

Name the driving force for water movements in plants.

What are the two factors which affect osmosis?

What is the condition of having more stomata on the lower surface called?