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231. Of which tissue nails hoofs and horns are made of
  A.  Cutide
  B.  Chitin
  C.  Tunicin
  D.  Keratin
     
   
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232. Which chromosomal combination is responsible for malesness in man
  A.  XO
  B.  YO
  C.  XY
  D.  XX
     
   
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233. In Cauliflower plant the useful part is:
  A.  Underground stem
  B.  Young inflorescence
  C.  Root
  D.  Leaves
     
   
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234. 'Stone Cancer' occurs due to:
  A.  Acid rain
  B.  Global warming
  C.  Radioactivity
  D.  Bacterial action
     
   
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235. Mercury poisoning in man causes the disease
  A.  Black lung
  B.  Arsenicosis
  C.  Minamata
  D.  Tai-Etai
     
   
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236. Chromosomes consist of
  A.  DNA and proteins
  B.  RNA and amino acids
  C.  DNA and lipids
  D.  RNA and sugar
     
   
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237. The yellow colour of urine is due to presence of
  A.  Bile
  B.  Urochrome
  C.  Cholesterol
  D.  Lymph
     
   
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238. Which of the following is knwon as 'grave yard' of RBC's?
  A.  Liver
  B.  Bone marrow
  C.  Appendix
  D.  Spleen
     
   
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239. Itai-itai disease is due to poisoning caused by
  A.  Mercury
  B.  Arsenic
  C.  Cadmium
  D.  Asbestos
     
   
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240. Bio-diesel is mostly produced by;
  A.  Euphorbiaceae
  B.  Malvaceae
  C.  Liliaceae
  D.  Myrtaaceae
     
   
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