[Campbell Biology P.886] The text mentions that crops genetically modified to express transg... | Practice Question

The text mentions that crops genetically modified to express transgenes from Bacillus thuringiensis Bt require less pesticide. What is the primary reason for this benefit?

  • A: The Bt transgenes make the crops resistant to herbicides.
  • B: The crops produce a protein (Bt toxin) that is toxic to certain insect pests.
  • C: The Bt transgenes enhance the plant's natural photosynthetic efficiency.
  • D: The presence of Bt transgenes improves the soil's nutrient absorption, making plants healthier.

Explanation

The text explicitly states: 'Crops that have been genetically modified to express transgenes from Bacillus thuringiensis, a soil bacterium, require less pesticide. The transgenes involved encode a protein Bt toxin '. This indicates that the Bt toxin produced by the plant acts as a natural pesticide against insects.