STD 12 - 12. ecosystem — BIOLOGY STD 12 Science — Question

$(i)$ Due to alteration of $DNA$ sequences genotype is change.

$(ii)$ Changes occur in phenotype.

$(iii)$ Variation create in $DNA$

$I.$ The bacteria Bacillusthuringiensis $(B t)$ are used to control butterfly catterpillers

$II.$ Fresh spores of $B t$ are mixed with water and sprayed on seeds such as brassicas and fruit trees

$III.$ Insect larvae, after eating these are killed by the toxin released in their gut

$IV.$ Bt toxin genes have been introduced into plants to provide resistance to pests

Which of the statements given above are correct?

Reason: Plasmids are usually present in eukaryotic cells.