Question

Write an essay on the applications of biotechnology in agriculture.

Hint:

Cover: Bt crops, RNAi resistance, Golden Rice, and biofertilizers/biopesticides.

Answer 1

Step 1: Introduce agricultural biotechnology:
Biotechnology has enabled genetic modification of crop plants to improve yield, nutritional value, and resistance to pests, diseases and environmental stress, addressing major agricultural challenges.

Step 2: Describe pest and herbicide resistance applications:
Bt crops, such as Bt cotton and Bt brinjal, carry a cry gene from the bacterium Bacillus thuringiensis, whose toxin protein kills specific insect pest larvae feeding on the plant, reducing dependence on chemical pesticides; RNA interference (RNAi) technology has similarly been used, for example, to make tobacco plants resistant to the nematode Meloidogyne incognitia by silencing a gene essential to the nematode's survival.

Step 3: Describe nutritional and other improvements:
Golden Rice has been genetically engineered to produce beta-carotene (a precursor of vitamin A) in the rice grain, aiming to address vitamin A deficiency in populations dependent on rice as a staple food; other applications include developing herbicide-tolerant crops, improving drought/salinity tolerance, and producing biofertilizers and biopesticides as eco-friendly alternatives to chemical inputs.

Final Answer:
Biotechnology applications in agriculture include Bt pest-resistant crops, RNAi-based nematode resistance, nutritionally enhanced crops like Golden Rice, herbicide-tolerant and stress-tolerant crop varieties, and biofertilizers/biopesticides.