Bt toxin genes have been expressed in plants in order to provide resistance against
(i) lepidopterans and fungi
(ii) animals and bacteria
(iii) bacteria and fungi
(iv) coleopterans and dipterans
(v) lepidopterans

Options

A. (ii) and (iii)
B. (i),(ii) and (iv)
C. (iii) and (v)
D. (iv) and (v)

Answer

To solve the question regarding the resistance provided by Bt toxin genes expressed in plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Source of Bt Toxin**:
- Bt toxin is derived from the bacterium *Bacillus thuringiensis* (Bt). This bacterium produces a protein that is toxic to certain insects.

2. **Identify the Target Insects**:
- The main groups of insects that are affected by Bt toxin include:
- **Lepidopterans**: This group includes moths and butterflies. Examples include the Tobacco Budworm and Armyworm.
- **Coleopterans**: This group includes beetles.
- **Dipterans**: This group includes flies and mosquitoes.

3. **Analyze the Options**:
- (i) Lepidopterans and fungi
- (ii) Animals and bacteria
- (iii) Bacteria and fungi
- (iv) Coleopterans and dipterans
- (v) Lepidopterans

4. **Evaluate Each Option**:
- **Option (i)**: Lepidopterans are affected, but fungi are not targeted by Bt toxin.
- **Option (ii)**: Animals and bacteria are not the primary targets of Bt toxin.
- **Option (iii)**: Bacteria and fungi are not affected by Bt toxin.
- **Option (iv)**: This option includes Coleopterans (beetles) and Dipterans (flies), which are both affected by Bt toxin.
- **Option (v)**: While Lepidopterans are affected, this option does not include the other groups.

5. **Select the Correct Answer**:
- The most comprehensive option that includes the groups affected by Bt toxin is **Option (iv)**: Coleopterans and Dipterans.

### Final Answer:
**The correct answer is (iv) coleopterans and dipterans.**

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