MCQ

In the above picture $Q$ represents.
- AExitation of the atria.
- BDepolarisation of ventricles.
- ✓Begining of systole.
- DRepolarisation.

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Column $I$
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Column $II$
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| $A$ | Hemaphrodite | $i.$ | Produces blood cells and haemoglobin |
| $B$ | Direct development | $ii.$ | Tectis and ovary in the same animal |
| $C$ | Chemoreceptor | $iii.$ | Larval from absent |
| $D$ | Blood gland in earthworm | $iv.$ | Sense of chemical substances |
$R$- They are the most important vegetative organ for photosynthesis