Which of the following is not a modification of plant organ for arid region?

Options

A. Phylloclade
B. Sporophylls
C. Phyllode
D. Spine

Answer

To solve the question "Which of the following is not a modification of plant organ for arid region?", we will analyze each option provided:

1. **Phylloclade**:
- A phylloclade is a modified stem that takes on the role of photosynthesis, typically found in arid regions to reduce water loss. This is indeed a modification of a plant organ.

2. **Sporophyll**:
- A sporophyll is a leaf that bears sporangia, which are structures that produce spores. It is not specifically a modification for arid conditions. Instead, it serves a reproductive function and is not a modification of a plant organ for arid regions.

3. **Phyllode**:
- A phyllode is a modified petiole (the stalk that attaches the leaf blade to the stem) that resembles a leaf and performs photosynthesis. This is also a modification of a plant organ.

4. **Spine**:
- A spine is a modified leaf or stipule that serves to reduce water loss and protect the plant from herbivores. This is another modification of a plant organ.

Now, summarizing the analysis:
- Phylloclade, phyllode, and spine are all modifications of plant organs for arid regions.
- Sporophyll, however, is not a modification for arid conditions but a reproductive structure.

Thus, the correct answer is **Sporophyll**.

### Steps:
1. Identify and analyze each option.
2. Determine which options are modifications of plant organs for arid regions.
3. Conclude that Sporophyll is not a modification for arid conditions.