Class XI

The most abundant intracellular cation is
  1. Na+
  2. Ca++
  3. H +
  4. K +
The hardest substance available on earth is
  1. Gold
  2. Iron
  3. Diamond
  4. Platinum
Pigment-containing membranous extensions in some cyanobacteria are
  1. Heterocysts
  2. Basal bodies
  3. Pneumatophores
  4. Chromatophores
Choose one of the following in th increasing order of bond length
  1. F2, N2, Cl2, O2
  2. Cl2 < O2 < N2 < F2
  3. F2 < Cl2 < O2 < N2
  4. N2 < O2 < F2 < Cl2
Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as :
  1. Genetic flow
  2. Genetic drift
  3. Random mating
  4. Genetic load
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LKG - 12th

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