Part of fungal hyphae known to occur inside cortical cells is

Options

A. endomycorrhiza
B. ectomycorrhiza
C. lichen
D. both (1) and (2)

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about a specific part of fungal hyphae that occurs inside cortical cells. We need to identify the correct term from the given options.

2. **Identifying the Options**: The options provided are:
- A) Endomycorrhiza
- B) Ectomycorrhiza
- C) Lycate
- D) Both A and B

3. **Defining Endomycorrhiza**: Endomycorrhiza refers to a type of mycorrhizal association where the fungal hyphae penetrate the cortical cells of the plant roots. This type of relationship is beneficial for nutrient exchange between the plant and the fungus.

4. **Defining Ectomycorrhiza**: Ectomycorrhiza, on the other hand, forms a sheath around the root but does not penetrate the cortical cells. It primarily exists outside the root cells.

5. **Analyzing the Options**: Since the question specifically asks for the part of fungal hyphae that occurs inside cortical cells, we can eliminate ectomycorrhiza and the option "both A and B" because ectomycorrhiza does not fit the criteria.

6. **Conclusion**: The correct answer is A) Endomycorrhiza, as it is the type of fungal hyphae that occurs inside the cortical cells of plant roots.

### Final Answer:
The part of fungal hyphae known to occur inside cortical cells is **A) Endomycorrhiza**.