STD 12 - 7. human health and disease — NEET STD 11 Science — Question

$I.$ 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?

$I.$ Each myosin is a polymerized protein

$II.$ Many meromyosin constitutes one thick filament (myosin)

$III.$ Each meromyosin's tail is called heavy meromyosin $(HMM)$ and head is called light meromyosin $(LMM)$

$IV.$ The globular head is an active $ATP$ ase enzyme and has binding sites for $ATP$ and active sites for actin

Choose the option with correct statements