561. Grey hair is caused due to
     

1. 1. aging of epidermal cells
      

   
   
   

   2. death of dermal cells
      

   
   
   

   3. loss of sebum in epidermal cells
      

   
   
   

   4. loss of melanin in epidermal cells

   
   
   

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1. View Hint View Answer Discuss in Forum

   loss of melanin in epidermal cells

   Correct Option: D

   loss of melanin in epidermal cells

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562. Which of the following is not an endocrine gland ?

1. 1. Pituitary

   
   
   

   2. Thyroid

   
   
   

   3. Adrenal

   
   
   

   4. Spleen

   
   
   

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1. View Hint View Answer Discuss in Forum

   Spleen

   Correct Option: D

   Spleen

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563. Typhoid fever is caused by

1. 1. Bacterium

   
   
   

   2. Protozoa

   
   
   

   3. Fungi

   
   
   

   4. Virus

   
   
   

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1. View Hint View Answer Discuss in Forum

   Bacterium

   Correct Option: A

   Bacterium

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564. Green manure is obtained from
     

1. 1. Fresh animal excreta
      

   
   
   

   2. Decomposing green legume plants
      

   
   
   

   3. Domestic vegetable waste
      

   
   
   

   4. Oil seed husk cakes

   
   
   

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1. View Hint View Answer Discuss in Forum

   Green manure is obtained from decomposing green legume plants.

   Correct Option: B

   Green manure is obtained from decomposing green legume plants.

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565. What is the impact of advancing glaciers on the rings of trees ?
     

1. 1. They become concentric
      

   
   
   

   2. Their shape is distorted
      

   
   
   

   3. They become widely spaced
      

   
   
   

   4. They are immune to this change

   
   
   

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1. View Hint View Answer Discuss in Forum

   Advancing glaciers distort the shape of the rings of trees.

   Correct Option: B

   Advancing glaciers distort the shape of the rings of trees.

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