56. Prolonged water logging kills plant due to

1. 1. Stoppage of root respiration

   
   
   

   2. Dilution of soil nutrients

   
   
   

   3. Dilution of plant cell sap

   
   
   

   4. Leaching of nutrient

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

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57. Exchange of substances between individual cells and their environment takes place try

1. 1. Active transport

   
   
   

   2. Osmosis

   
   
   

   3. Diffusion

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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58. Food products are kept in cold storage or refrigeration in order to

1. 1. Make them tasty

   
   
   

   2. Use in off season

   
   
   

   3. maintenance of freshness, longevity and teste due

   
   
   

   4. Keep them cool

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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59. Which one of the following statements is false

1. 1. Photosynthesis occur in presence of sunlight

   
   
   

   2. CO₂is used during photosynthesis

   
   
   

   3. O₂ is used during photosynthesis

   
   
   

   4. O₂ comes out during photosynthesis

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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60. Leaf of Mimosa droops down on touching because of

1. 1. Water loss from leaflet base

   
   
   

   2. Change in water concentration

   
   
   

   3. Loss of water from cell to intercellular space in paulvinus and pulvinules

   
   
   

   4. All of above

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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