191. Which of the following systems in man is affected by the bite of cobra ?

1. 1. Digestive

   
   
   

   2. Nervous

   
   
   

   3. Excretory

   
   
   

   4. Circulatory

   
   
   

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   Poison of cobra is most virulent. It is a neurotoxin attacking nerve centres and causing paralysis of muscles, especially those of respiratory muscles.

   Correct Option: B

   Poison of cobra is most virulent. It is a neurotoxin attacking nerve centres and causing paralysis of muscles, especially those of respiratory muscles.

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192. 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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193. 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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   All of these

   Correct Option: D

   All of these

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194. 'Pond silk' is the common name of

1. 1. Spongilla

   
   
   

   2. Chlorella

   
   
   

   3. Selaginella

   
   
   

   4. Spirogyra

   
   
   

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   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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195. Which of the following is a non-poisonous snake ?

1. 1. Python

   
   
   

   2. Cobra

   
   
   

   3. Dryophis

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Python

   Correct Option: A

   Python

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