581. Saprophytes are the organisms which depend for food on
     

1. 1. living plants
      

   
   
   

   2. living animals
      

   
   
   

   3. dead and decaying material
      

   
   
   

   4. inorganic chemical compounds

   
   
   

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1. View Hint View Answer Discuss in Forum

   Saprophytes are the organisms which depend for food on dead and decaying material.

   Correct Option: C

   Saprophytes are the organisms which depend for food on dead and decaying material.

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582. Who coined the term ‘gene’?

1. 1. Mendel

   
   
   

   2. Johannsen

   
   
   

   3. Watson

   
   
   

   4. Beadle

   
   
   

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1. View Hint View Answer Discuss in Forum

   Gene is a segment of DNA in all living organisms.

   Correct Option: B

   Gene is a segment of DNA in all living organisms.

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583. DNA contains
     

1. 1. Pentose sugar
      

   
   
   

   2. Hexose sugar
      

   
   
   

   3. Erythrose sugar
      

   
   
   

   4. Sedoheptulose sugar

   
   
   

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1. View Hint View Answer Discuss in Forum

   Deoxyribonucleic Acid contains Pentose sugar.

   Correct Option: A

   Deoxyribonucleic Acid contains Pentose sugar.

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584. A cross between homozygous recessive and heterozygous plant is
     

1. 1. Back cross
      

   
   
   

   2. Test cross
      

   
   
   

   3. Monohybrid cross
      

   
   
   

   4. Dihybrid cross

   
   
   

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1. View Hint View Answer Discuss in Forum

   A cross between homozygous recessive and heterozygous plant is called Test Cross.

   Correct Option: B

   A cross between homozygous recessive and heterozygous plant is called Test Cross.

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585. RBCs do not perform aerobic respiration because these do not contain

1. 1. Mitochondria

   
   
   

   2. Nucleus

   
   
   

   3. Endoplasmic Reticulum

   
   
   

   4. Lysosomes

   
   
   

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1. View Hint View Answer Discuss in Forum

   Red Blood Corpusles (RBCs) do not contain Mitochondria.

   Correct Option: A

   Red Blood Corpusles (RBCs) do not contain Mitochondria.

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