Former is a genus with a storage leaf base and latter with pulvinous leaf base. Former and latter genera respectively are

Options

A. Oryza and Pisum
B. Pisum and Zea mays
C. Trapa and Dolichos
D. Allium and Dolichos

Answer

To solve the question regarding the genera with specific types of leaf bases, we will follow these steps:

### Step 1: Identify the Characteristics of the Former Genus
The question states that the "former" genus has a storage leaf base. This means we need to identify a plant that has a leaf base that stores nutrients.

### Step 2: Determine the Plant with a Storage Leaf Base
Upon examining common plants, the onion (Allium) is known for having a modified leaf base that swells and stores food. The bulb of the onion is a classic example of a storage organ.

### Step 3: Identify the Characteristics of the Latter Genus
The "latter" genus is described as having a pulvinous leaf base. A pulvinous leaf base is characterized by its ability to exhibit movements, such as nictinastic and thigmonastic movements.

### Step 4: Determine the Plant with a Pulvinous Leaf Base
Dolichos (also known as the hyacinth bean) is a plant that exhibits these types of movements due to its pulvinous leaf base. This allows the leaves to move in response to environmental stimuli.

### Step 5: Conclude the Answer
Based on the characteristics and examples provided:
- The former genus with a storage leaf base is **Allium (Onion)**.
- The latter genus with a pulvinous leaf base is **Dolichos**.

Thus, the answer to the question is:
**Former: Allium (Onion); Latter: Dolichos.**

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