Hilum is
a) present opposite micropylar end
b) a junction between ovule and funicle
c) enclose a mass of cell called the nucellus
d) None of the above

Options

A. present opposite micropylar end
B. a junction between ovule and funicle
C. enclose a mass of cell called the nucellus
D. None of the above

Answer

To solve the question regarding the definition of "Hilum," we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the term "Hilum":**
- The hilum is a specific part of an ovule in flowering plants. It is important to know its location and function.

2. **Analyzing Option A: "present opposite micropylar end":**
- The micropylar end is the end of the ovule where the pollen tube enters during fertilization. The hilum is not located opposite this end; instead, it is found at the base of the ovule. Therefore, this option is incorrect.

3. **Analyzing Option B: "a junction between ovule and funicle":**
- The funicle is the stalk that attaches the ovule to the ovary wall. The hilum is indeed the point where the ovule connects to the funicle. This option correctly describes the hilum.

4. **Analyzing Option C: "enclose a mass of cell called the nucellus":**
- The nucellus is the tissue within the ovule that contains the embryo sac. However, the hilum does not enclose the nucellus; it is simply the point of attachment. Thus, this option is also incorrect.

5. **Analyzing Option D: "None of the above":**
- Since we have identified that Option B is correct, this option is not valid.

### Conclusion:
Based on the analysis, the correct answer is **b) a junction between ovule and funicle**.

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