MCQ
A dicotyledenous plant showing parallel venation is
- ADioscorea
- BSmilax
- ✓Calophyllum
- DHibiscus
Exceptionally few dicots show parallel venation, e.g., Calophyllum and Eryngium.
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| Column $-I$ | Column $-II$ | ||
| $A$ | Family | $I$ | tuberosum |
| $B$ | Kingdom | $II$ | Polymoniales |
| $C$ | Order | $III$ | Solanum |
| $D$ | Species | $IV$ | Plantae |
| $E$ | Genus | $V$ | Solanaceae |

$R -$ The concentration of $CO_2$ is between $0.03$ and $0.04$ percent. Increase in concentration upto $0.005$ percent can cause an increase in $CO_2$ fixation rates.