Transgenic Crops
Bt cotton resists insect pests due to expression of:
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About This Question
- Subject
- biology
- Chapter
- biotechnology and its applications
- Topic
- transgenic crops
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Cry toxin
- Source: Bacillus thuringiensis (Bt) is a soil bacterium that produces certain proteins during a specific phase of their growth.
- The Toxin: These proteins form crystalline inclusions and are called Cry proteins (pro-toxins).
- Activation: When an insect (like cotton bollworm) ingests the toxin, it is converted into an active form due to the alkaline pH of the insect's midgut.
- Damage: The active toxin binds to the surface of midgut epithelial cells, creates pores, and causes cell swelling and lysis, eventually killing the insect.
- Engineering: The cry genes are isolated and incorporated into the cotton genome to create pest-resistant Bt cotton.
This easy difficulty biology question is from the chapter biotechnology and its applications, covering the topic of transgenic crops. It appeared in the 2025 exam.
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