
- ABone marrow
- BLymph node
- CLymph vessel
- ✓Thymus

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$I.$ use of biofertilisers and biopesticides
$II.$ crop rotation
$III.$ locally developed pest resistant varieties
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$I.$ DNA being a hydrophilic molecule cannot pass through cell membranes
$II.$ Agrobacteriumtumefaciens delivers a piece of $DNA$ known as $'Z-DNA'$ in the Tiplasmid which transforms normal plant cells into tumour cells to produce chemical against pathogens
$III.$ Retrovirus, adenovirus, papillomavirus are also now used as cloning vectors in animal because of their ability to transform normal cells into cancerous cell.
$IV.$ In genetic engineering, $DNA$ from different sources are cut with the same restriction enzymes so that both $DNA$ fragments have same kind of sticky ends
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$I.$ $pH$ of soil
$II.$ mineral composition of the soil
$III.$ water holding capacity of soil
$IV.$ weather condition
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$(1)$ Is the trait recessive of dominant ?
$(2)$ is the trait sex linked or autosomal ?