The introduction of cry gene in Bt cotton was aimed at:

Options

A. providing pest resistance to boll worm
B. dellaying flowering of cotton
C. preventing attack of coleopteran pests
D. preventing use of chemical pesticides

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the purpose of introducing the cry gene into Bt cotton. The cry gene is derived from the bacterium Bacillus thuringiensis (Bt).

2. **Identifying the Source of the Cry Gene**: The cry gene is sourced from Bacillus thuringiensis, a soil-dwelling bacterium known for its insecticidal properties. This bacterium produces proteins that are toxic to certain insects.

3. **Function of the Cry Gene**: The cry gene encodes for proteins that are specifically toxic to certain insect pests, particularly the cotton bollworm (Halliothis). When these insects consume the leaves of Bt cotton, they ingest the Bt protein, which disrupts their digestive system and ultimately kills them.

4. **Analyzing the Options**: The options provided in the question include:
- A) Providing pest resistance to bollworm
- B) Delaying flowering of the cotton
- C) Preventing attack of the cleopatran pest
- D) Preventing the use of chemical pesticides

5. **Selecting the Correct Answer**: Since the primary aim of introducing the cry gene in Bt cotton is to provide resistance against the cotton bollworm, option A is the correct answer.

6. **Conclusion**: The introduction of the cry gene in Bt cotton was aimed at providing pest resistance to bollworms, which helps in reducing crop damage and the need for chemical pesticides.

**Final Answer**: The introduction of cry gene in Bt cotton was aimed at providing pest resistance to bollworms.

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