which of the following statement is correct ?
A. Single cell protein is rich in high quality proteins bit poor in fat
B. BOD is the amount of oxygen that would be consumed if all the inroganic matter in one litre of water were oxidised by bacteria .
C. Trichoderma sp are free living fungi that are effictive biocontrol agents of several pathogens.
D. Bacillus thuingiensis are pathogens that attack insects and other arthrpods .
E. Bacillus thuringiensis is first used biopesticide.
F. Lactose enzyme is used in alcoholic fermentation .
G. Mycorrhiza is a symbiotic associtation between fungi e.g. Glomus and vascular plant .

Options

A. B,C,F,G
B. A,D,F
C. A,C,D,E,G
D. B,F

Answer

To determine which of the statements is correct, we will evaluate each option one by one.

### Step-by-Step Solution:

1. **Option A: Single cell protein is rich in high quality proteins but poor in fat.**
- **Evaluation:** This statement is correct. Single cell proteins (SCP) are derived from microorganisms and are known for being high in protein content while typically having low fat content.
- **Conclusion:** Option A is correct.

2. **Option B: BOD is the amount of oxygen that would be consumed if all the inorganic matter in one litre of water were oxidised by bacteria.**
- **Evaluation:** This statement is incorrect. BOD (Biochemical Oxygen Demand) refers to the amount of oxygen consumed by bacteria while decomposing organic matter in water, not inorganic matter.
- **Conclusion:** Option B is incorrect.

3. **Option C: Trichoderma sp. are free living fungi that are effective biocontrol agents of several pathogens.**
- **Evaluation:** This statement is correct. Trichoderma species are known to be effective biocontrol agents against various plant pathogens.
- **Conclusion:** Option C is correct.

4. **Option D: Bacillus thuringiensis are pathogens that attack insects and other arthropods.**
- **Evaluation:** This statement is correct. Bacillus thuringiensis produces a crystal protein that is toxic to certain insects and is used as a biopesticide.
- **Conclusion:** Option D is correct.

5. **Option E: Bacillus thuringiensis is the first used biopesticide.**
- **Evaluation:** This statement is correct. Bacillus thuringiensis was one of the first microbial biopesticides used in agriculture.
- **Conclusion:** Option E is correct.

6. **Option F: Lactose enzyme is used in alcoholic fermentation.**
- **Evaluation:** This statement is incorrect. Alcoholic fermentation primarily involves yeast and the enzyme involved is not lactose but rather zymase, which converts sugars into alcohol.
- **Conclusion:** Option F is incorrect.

7. **Option G: Mycorrhiza is a symbiotic association between fungi (e.g., Glomus) and vascular plants.**
- **Evaluation:** This statement is correct. Mycorrhiza refers to the beneficial relationship between fungi and the roots of vascular plants.
- **Conclusion:** Option G is correct.

### Final Conclusion:
The correct statements are A, C, D, E, and G.