STD 12 - 5. molecular basis of inheritance — BIOLOGY STD 12 Science — Question

$I.$ This method is also known as biolistic technique

$II. $ In this method cells are bombarded with high velocity micro-particles of gold or tungsten coated with $DNA$ in plants

$III.$ Important crop plants like maize, rice and wheat have now been transformed by this method

Which of the statements given above are correct?

$(i)$ $RNA$ can directly code for the synthesis of proteins

$(ii)$ It is very common process to synthesis $DNA$ from $RNA$

$(iii)$ $RNA$ is used as genetic material only in human

$(iv)$ One polynucleotide chain is present in $RNA$

$I.$ Chemical fertilizers cause pollution of water bodies as well as groundwater, besides getting stored in crop plants. Therefore, environmental scientists are pressing for a switch over to organic farming.

$II.$ Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost and biological pest Select the correct statement