Bulliform cells are formed in the epidermis of ............ leaf.

Explanation

**Step-by-Step Solution:**

1. **Understanding Bulliform Cells**: Bulliform cells are specialized epidermal cells that are typically found in certain types of leaves. They play a crucial role in the leaf's response to water availability.

2. **Identifying Leaf Types**: There are different types of leaves based on their structure and arrangement. One important type is the isobilateral leaf, also known as an equifacial leaf.

3. **Characteristics of Isobilateral Leaves**: Isobilateral leaves have both surfaces (adaxial and abaxial) that receive equal amounts of sunlight. This means that there is no distinct upper or lower surface, and both sides can appear similar in color and texture.

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