Question

3. Which is useful as biological control of pests and pathogenic microbes ?


(a) Trichoderma against certain plant pathogens


(b) Ladybird beetle against aphids in mustard


(c) Bt cotton for increasing cotton yield


(d) Nucleopolyhedrovirus against white rust in Brassica​

Answer 1

Answer:

ladybird beetle is a natural pest for preventing the aphides to eat rapidly the the mustard and also for wheat and lemon grasses

Answer 2

$\bold{\huge{\underline{\underline{\rm{ Answer!:}}}}}$

C

$\bold{\huge{\underline{\underline{\rm{ </u></em></strong><strong><em><u>Explanat</u></em></strong><strong><em><u>ion</u></em></strong><strong><em><u>!</u></em></strong><strong><em><u> :}}}}}$

Scientists have now identified the genes for insecticidal crystal proteins.

They have isolated these genes from the bacteria and incorporated them into the genetic materials of various crop plants through recombinant technology.

Several field crops, such as cotton, rice, tomato, and soybean have been genetically modified in this way to fight against various insect pests.

Bt-cotton is one such example,

which is being cultivated in many states of our country