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Identify the pair that exhibit circinate...

Identify the pair that exhibit circinate vernation

A

Equisetum and Selaginella

B

Riccia and Nephrolepis

C

Nephrolepis and Cycas

D

Psilotum and Riccia.

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Vernation**: Start by defining vernation, which is the arrangement of leaves in a bud. It can occur in various forms, including circinate vernation. 2. **Defining Circinate Vernation**: Circinate vernation refers to the coiled arrangement of young leaves (fronds) as they emerge from the bud. This coiling protects the leaf tip during development. 3. **Identifying Characteristics**: In circinate vernation, the coiled fronds (also known as croziers) uncoil from the base towards the apex as they mature. This uncoiling process is crucial for the proper development of the leaves. 4. **Analyzing the Options**: - **Option 1: Equisetum and Coelaginella**: Neither of these plants is known for circinate vernation. - **Option 2: Ricia and Nephrolapis**: Ricia does not exhibit circinate vernation. - **Option 3: Nephrolapis and Cycus**: Both of these plants exhibit circinate vernation. - **Option 4: Coelotum and Ricia**: Neither of these plants is known for circinate vernation. 5. **Conclusion**: Based on the analysis, the correct pair that exhibits circinate vernation is **Nephrolapis and Cycus**. **Final Answer**: Option 3: Nephrolapis and Cycus. ---
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