MCQ
Specialized cells for fixing atmospheric nitrogen in Nostoc are
- AArchegoniophore
- ✓Heterocysts
- CHormogonia
- DPellicles
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| Column $-I$ (Classes) |
Column $-II$ (Examples) |
||
| $A$ | Psilotopsida | $I$ | Dryopteris, Pteris, Adiantum |
| $B$ | Lycopsida | $II$ | Equisetum |
| $C$ | Sphenopsida | $III$ | Selaginella |
| $D$ | Pteropsida | $IV$ | Lycopodium |
| $V$ | Psilotum |
$‘A’ $ $ ‘B’$
$(1) $ Auxin $(I)$ Ripening and maturity of fruits
$(2)$Gibberellin $(II)$Differentiation of xylem elements
$(3) $ Cytokinin $(III)$ Prevention of genetic and physiological dwarfism
$(4) $ Ethylene $(IV)$ Found from tumour tissue of tobacco
$(1)$ $(2)$ $(3)$ $(4)$