MCQ
Scapula is a triangular bone situated
- ✓Dorsal part of thorax between $2^ {nd}$ and $7^ {th}$ ribs
- BVentral part of thorax between $2^ {nd}$ and $7^ {th}$ ribs
- CMedial part of thorax between $2^ {nd}$ and $7^ {th}$ ribs
- DNone of the above
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$R$ : Epithelial cells are not secretory in nature.
$I.$ 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?