MCQ
Nitrogen fixation by Nostoc takes place in
- ✓Heterocysts
- BVegetative cells
- CAkinetes
- DHormogonia
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$R$ : It is the occurrence of horizontal zonation in the ecosystem.
| Column$-I$ | Column$-II$ |
| $(a)$ Golgi apparatus | $(i)$ Synthesis of protein |
| $(b)$ Lysosomes | $(ii)$ Trap waste and excretory products |
| $(c)$ Vacuoles | $(iii)$ Formation of glycoproteins and glycolipids |
| $(d)$ Ribosomes | $(iv)$ Digesting biomolecules |
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