Question
- Which insects are killed by Bacillus thuringiensis?
- The Bt binds to which cells?
- In which plants Bt toxin is used?
✓
Answer
- The activated toxin binds to the surface of midgut epithelial cells and creates pores that cause cell swelling and lysis leading to the death of an insect.
- Bacillus thuringiensis forms protein crystals (Cry) during a particular phase of their growth. These crystals contain a toxic insecticidal protein.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Sketch and label T. S. of angiospermic anther.
Explain giving one example, how co-extinction is one of the cause of biodiversity loss? List the other three causes also.
- Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
- Identify ‘a’, ‘b’ and ‘c’ in the following table:
| No. | Crop | Variety | Insect Pests |
| 1. | Brassica | Pusa Gaurav | (a) |
| 2. | Flat bean | Pusa Sem 2, Pusa Sem 3 | (b) |
| 3. | (c) | Pusa Sawani, Pusa A-4 | Shoot and fruit borer |
- How is ozone formed in the 'stratosphere'?
- CFCs contribute to ozone hole formation. Explain.
Palaeontological evidence support the theory of organic evolution. Explain with an example.
Typhoid is food and water-borne disease.
- State Oparin-Haldane’s hypothesis.
- How does S.L. Miller’s experiment supports it?
If the meiocyte of a maize plant contains 20 chromosomes, write the number of chromosomes in the endosperm and embryo of the maize grain and give reasons in support of your answer.
In the figure given below label the following parts: male gametes, egg cell, polar nuclei, synergid and pollen tube,
Sketch and label the T. S. of the thyroid gland.