MCQ
What is the practical utility of genetics
- AImprovement in qualities of pet animals
- BImprovement in crop quality
- CImprovement in qualities of man
- DAll the above
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$a \quad\;b \quad\;c \quad\;d$

$I.$ Ladybirds and dragonflies are used to get rid of aphids and mosquitoes
$II.$ The bacteria Bacillus thuringiensis $(B t)$ are used to control butterfly caterpillars
$III.$ Trichoderma sp. free living fungi, are present in root ecosystems where they act against several plant pathogens
$IV.$ Rhizobium is a symbiotic bacterium that lives in the stem of legumes
Which of the statements given above are correct?