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  1. Which of the following is a chemical transmitter for neuro impulse conduction?
  2. Which of the following endo parasites of humans does show viviparity ?
  3. Tobacco plants resistant to a nematode have been developed by the introduction of DNA
  4. Cell elongation in internodal region takes place due to
  5. Endosperm a product of double fertilization in angiosperms is absent in