66. 'Pond silk' is the common name of

1. 1. Spongilla

   
   
   

   2. Chlorella

   
   
   

   3. Selaginella

   
   
   

   4. Spirogyra

   
   
   

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1. View Hint View Answer Discuss in Forum

   Spirogyra is a freshwater alga found freely floating on the surface of the stagnant pools, ponds and ditches, etc. It is commonly known as water silk or pond silk.

   Correct Option: D

   Spirogyra is a freshwater alga found freely floating on the surface of the stagnant pools, ponds and ditches, etc. It is commonly known as water silk or pond silk.

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67. Ephedrine obtained from the stem of Ephedra is given to cure

1. 1. asthma

   
   
   

   2. respiratory disorder

   
   
   

   3. cold and cough

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   All of these

   Correct Option: D

   All of these

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68. Which one is a link between chordates and nonchordates ?

1. 1. Sphenodon

   
   
   

   2. Balanoglossus

   
   
   

   3. Crocodilia

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Balanoglossus

   Correct Option: B

   Balanoglossus

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69. Which of the following is not an insect ?

1. 1. Cockroach

   
   
   

   2. Bed bug

   
   
   

   3. Mosquito

   
   
   

   4. Spider

   
   
   

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1. View Hint View Answer Discuss in Forum

   Spider belongs to class arachnida.

   Correct Option: D

   Spider belongs to class arachnida.

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70. In which phylum nerve cells are found but nerves are absent ?

1. 1. Porifera

   
   
   

   2. Coelenterata

   
   
   

   3. Platyhelminthes

   
   
   

   4. Nemathelminthes

   
   
   

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1. View Hint View Answer Discuss in Forum

   Coelenterata

   Correct Option: B

   Coelenterata

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