Continuous and discontinuous collenchymatic ring is found in dicots like

Options

A. Cucurbita and Helianthus
B. Helianthus and Cucurbita
C. Zea mays and Helianthus
D. Cucurbita and Zea mays

Answer

To determine which dicots exhibit continuous and discontinuous collenchymatic rings, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Collenchyma**:
- Collenchyma is a type of plant tissue that provides support and flexibility. It is characterized by its living cells that are metabolically active.
- Continuous collenchyma forms a complete ring around the stem, while discontinuous collenchyma is found in patches or segments.

2. **Identify the Options**:
- The options provided are:
- A) Cucurbita and Helianthus
- B) Helianthus and Cucurbita
- C) Xiamase and Helianthus
- D) Cucurbita and Xiamase

3. **Research the Plants**:
- **Helianthus** (sunflower) is known to have continuous collenchymatic rings.
- **Cucurbita** (squash) is known to have discontinuous collenchymatic rings.

4. **Analyze the Options**:
- From the knowledge that Helianthus has continuous collenchyma and Cucurbita has discontinuous collenchyma, we can evaluate the options:
- A) Cucurbita and Helianthus: Incorrect, as it does not specify the correct arrangement.
- B) Helianthus and Cucurbita: Correct, as it places Helianthus first (continuous) and Cucurbita second (discontinuous).
- C) Xiamase and Helianthus: Incorrect, as Xiamase does not have relevant collenchyma information.
- D) Cucurbita and Xiamase: Incorrect, as it does not specify the correct arrangement.

5. **Conclusion**:
- The correct answer is option B: Helianthus and Cucurbita, where Helianthus has continuous collenchymatic rings and Cucurbita has discontinuous collenchymatic rings.

### Final Answer:
**B) Helianthus and Cucurbita**