Biology Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

  • The hilum is a scar on the :

  • AFruit, where it was attached to pedicel
  • BFruit, where style was present
  • CSeed, where micropyle was present
  • DSeed, where funicle was attached
  • Which one of the following statements is not true?

  • APollen grains of some plants cause severe allergies and bronchial afflictions in some people
  • BThe flowers pollinated by flies and bats secrete foul odour to attract them
  • CHoney is made by bees by digesting - pollen collected from flowers
  • DPollen grains are rich in nutrients, and they are used in the form of tablets and syrups
  • Which one of the following statements in incorrect?

  • AIn competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.
  • BThe competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex.
  • CThe presence of the competitive inhibitor decreases the Km of the enzyme for the substrate.
  • DA competitive inhibitor reacts reversibly withthe enzyme to form an enzyme- inhibitor complex.
  • Alleles are :

  • Atrue breeding homozygotes
  • Bdifferent molecular forms of a gene
  • Cheterozygotes
  • Ddifferent phenotype