NCERT Solutions for Class 11 Biology Chapter 11

Transport in Plants Class 11

Chapter 11 Transport in Plants Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 193

Q1 :  

What are the factors affecting the rate of diffusion?


Answer :

Diffusion is the passive movement of substances from a region of higher concentration to a region of lower concentration. Diffusion of substances plays an important role in cellular transport in plants. Rate of diffusion is affected by concentration gradient, membrane permeability, temperature, and pressure. Diffusion takes place as long as there is a difference between the concentrations of a substance across a barrier. However, diffusion stops, when the concentrations of the substance on either side of the barrier become equal. The permeability of a membrane affects the rate of diffusion. Diffusion rate increases as membrane permeability increases. Changes in temperature and pressure values also affect the diffusion of substances. Pressure plays an important role in the diffusion of gases as gases diffuse from a region of higher partial pressure to a region of lower partial pressure.

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Q2 :  

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


Answer :

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.

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Q3 :  

Describe the role played by protein pumps during active transport in plants.


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Q4 :  

Explain why pure water has the maximum water potential.


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Q5 :  

Differentiate between the following:

(a) Diffusion and Osmosis

(b) Transpiration and Evaporation

(c) Osmotic Pressure and Osmotic Potential

(d) Imbibition and Diffusion

(e) Apoplast and Symplast pathways of movement of water in plants.

(f) Guttation and Transpiration.


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Q6 :  

Briefly describe water potential. What are the factors affecting it?


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Q7 :  

What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution?


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Q8 :  

(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.


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Q9 :  

How is the mycorrhizal association helpful in absorption of water and minerals in plants?


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Q10 :  

What role does root pressure play in water movement in plants?


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Q11 :  

Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?


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Q12 :  

Discuss the factors responsible for ascent of xylem sap in plants.


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Q13 :  

What essential role does the root endodermis play during mineral absorption in plants?


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Q14 :  

Explain why xylem transport is unidirectional and phloem transport bi-directional.


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Q15 :  

Explain pressure flow hypothesis of translocation of sugars in plants.


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Q16 :  

What causes the opening and closing of guard cells of stomata during transpiration?


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<< Previous Chapter 10 : Cell Cycle and Cell Division Next Chapter 12 : Mineral Nutrition >>

Biology : CBSE NCERT Exercise Solutions for Class 11th for Transport in Plants will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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