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

$(I)$ Separation of $DNA$ fragment by electrophoresis.

$(II)$ Digestion of $DNA$ by restriction endonucleases.

$(III)$ Hybridization using labeled $VNTR$ probe

$(IV)$ Isolation of $DNA$.

$(V)$ Detection of hybridized $DNA$ fragments by autoradiography.

$(VI)$ Transferring of separated $DNA$ fragment to synthetic membranes.

$I$. Removal of $80\; \%$ tigers from an area resulted in greatly increased growth of vegetation.

$II.$ Removal of most of the carnivores resulted in an increased population of deers.

$III.$ The length of food chains is generally limited to $3$ to $4$ trophic levels due to energy loss.

$IV.$ The length of food chains may vary from $2$ to $8$ trophic levels.

Which two of the above statements are correct?