MCQ
A mutation is most likely to have a selective advantage in evolution if
- AIt affects dominant genes
- ✓It affects recessive genes
- CIt affects whole chromosomes
- DThe environment remains stable
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$I.$ Tidal volume
$II.$ Residual volume
$III.$ Expiratory reserve volume
$IV.$ Vital capacity
($i$) It consists of a series of fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
($ii$) There are six ganglia lie in the thorax, and three in the abdomen.
($iii$) The sense organs are antennae, eyes, maxillary pulps, labial pulps and anal cerci etc.
($iv$) Each eye consists of about $5000$ hexagonal ommatidia.
Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.