By applying which of the following practices,contamination of hydroponics plants can be reduced?

  • A
    Change the medium every week
  • B
    Do not use tools from the outdoor garden
  • C
    Complete aeration in hydroponic tank
  • D
    All of the above

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The toxin produced by the gene of $Bacillus \text{ } thuringiensis$ is effective against which of the following?

The toxic $Cry$ protein is released by the spores of . . . . . . which kills the larvae of butterflies feeding on plants like $Brassica$.

$Bt$ toxin kills the insect by:

The inactive form of $Bt$ toxin is converted to the active form in the insect gut $ . . . . . . $.

Bt toxins are initially inactive protoxins,but after ingestion by the insects,their inactive toxin becomes active due to the

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