MCQ
Greatest producers of organic matter are.
- ACrop plants.
- BForests.
- CPlants of the land area.
- ✓Phytoplankton of oceans.
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$(i)$ Provides shape to the cell.
$(ii)$ Protects the cell from mechanical damage and infection.
$(iii)$ Helps in cell to cell interaction.
$(iv)$ Provides barrier to undesirable macromolecules.