Class IX

The main arena of various types of activities of a cell is
  1. Nucleus
  2. Nucleus
  3. Mitochondria
  4. Cytoplasm
Middle lamella is composed mainly of
  1. Protein
  2. Hemicellulose
  3. Carbohydrate
  4. Calcium pectate
Electron microscope was discovered in
  1. 1945
  2. 1942
  3. 1941
  4. 1940
The suffix S in ribosome unit indicates
  1. Solubility
  2. Sedimentation coefficient
  3. Surface Area
  4. Size
Robert Brown discovered
  1. Protoplasm
  2. Nucleus
  3. Cell
  4. None of the above
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