MCQ
In higher vertebrates, $SA-$node helps in
- AConduction of blood
- ✓Initiation of heart beat
- COpening of tricuspid valve
- DOpening of bicuspid valve
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| Column $-I$ | Column $-II$ |
| $(A)$ Saccharomyces cerevisiae | $(i)$ Production of immuno-suppressive agent |
| $(B)$ Monascus purpureus | $(ii)$ Ripening of Swiss cheese |
| $(C)$ Trichoderma polysporum | $(iii)$ Commercial production of ethanol |
| $(D)$ Propionibacterium | $(iv)$ Production of blood-cholesterol lowering agents |