Class XI

Due to tar, an over multiplication of cells in lungs causes
  1. Atherosclerosis
  2. Insomnia
  3. Blood clotting
  4. Cancer
Gaseous pollutants include
  1. Biological decay
  2. Forest fires
  3. Volcanic eruptions
  4. All of these
Broad-spectrum antibiotics are developed through
  1. Erythromycins
  2. Cephalosporin
  3. Tetacyclines
  4. Penicillin
mall spherical or rod-shaped organelles are called as
  1. Chromatin
  2. Entrioles
  3. Cytoplasm
  4. Mitochondrion
Many freshwater fish
  1. Can live in oceans
  2. Cannot live in oceans
  3. Cannot live in river
  4. Cannot live in streams
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