Find the incorrect statement.

Options

A. Gene therapy is a genetic engineering technique used to treat diseases at molecular level by replacing defective genes with normal genes
B. Calcitonin is a medically useful recombinant product in the treatment of infertility
C. Bt toxin is a biodegradable insecticide obtained from Bacillus thuringiensis
D. Trichoderma sp. is a biocontrol agent for fungal diseases of plants

Answer

To find the incorrect statement among the given options, we will analyze each statement one by one.

1. **Gene therapy is a genetic engineering technique used to treat disease at the molecular level by replacing a defective gene with a normal gene.**
- This statement is **correct**. Gene therapy involves modifying genes to treat or prevent diseases, often by replacing defective genes with functional ones.

2. **Calcitonin is a medically useful recombinant product in the treatment of infertility.**
- This statement is **incorrect**. Calcitonin is a hormone that helps regulate calcium levels in the blood and does not have a role in treating infertility. It primarily functions to lower blood calcium levels and promote calcium absorption in bones and kidneys.

3. **Bt toxin is a biodegradable insecticide obtained from Bacillus thuringiensis.**
- This statement is **correct**. Bacillus thuringiensis (Bt) produces a toxin that is used as a biological pesticide to control various insect pests.

4. **Trichoderma species is a biocontrol agent for fungal diseases of plants.**
- This statement is **correct**. Trichoderma is a genus of fungi that is commonly used as a biocontrol agent to manage fungal diseases in plants.

After analyzing all the statements, the incorrect statement is:

**Calcitonin is a medically useful recombinant product in the treatment of infertility.**