151. Root hair absorb water from soil when

1. 1. Osmotic concentration is same in the two

   
   
   

   2. Solute concentration is higher in soil solution

   
   
   

   3. Solute concentration is higher in root hair

   
   
   

   4. Absorpton is active

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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152. If the stem grows toward sunlight, and root grow just opposite to it, stem movement is called

1. 1. negative phototrophic movement

   
   
   

   2. Phototrophic movement

   
   
   

   3. Positive phototrophic movement

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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153. The leaves of Mimosa pudica droop down on touch because

1. 1. Plant have nervous system

   
   
   

   2. The leaf are very tender

   
   
   

   3. The leaf tissue are injured

   
   
   

   4. The turgor pressure of leaf base changes

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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154. Fruit ripening is accelerated by

1. 1. Warm surroundings

   
   
   

   2. Increased nitrogen supply

   
   
   

   3. Reduced water supply

   
   
   

   4. Ethylene rich atmosphere

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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155. First step of photosynthesis is

1. 1. Activation of chlorophyll by sunlight

   
   
   

   2. Oxygen comes out from water

   
   
   

   3. Formation of carbohydrate

   
   
   

   4. Fixation of carbon dioxide

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

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