In plant 'A'stamens and carpels are placed at two different positions in a flower and in plant 'B' carpels and stamens are in two different flowers. A and B respectively are

Options

A. Abutilon and Datura
B. Solanum and Hibiscus
C. Maize and Castor
D. Hibiscus and Castor

Answer

To solve the question regarding the classification of plants A and B based on the arrangement of their reproductive structures, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Plant A's Characteristics**:
- In plant A, the stamens (male reproductive structures) and carpels (female reproductive structures) are located at two different positions within the same flower. This arrangement prevents self-fertilization.
- The purpose of this arrangement is to promote cross-pollination, which helps maintain genetic diversity and reduces the likelihood of passing on diseases or disorders.

2. **Examples of Plant A**:
- A common example of such a plant is the China Rose (Hibiscus). In Hibiscus flowers, the stamens and carpels are positioned in a way that encourages cross-pollination.

3. **Identify Plant B's Characteristics**:
- In plant B, the carpels and stamens are found in two different flowers. This means that the plant has unisexual flowers, where one flower contains only stamens (male) and another flower contains only carpels (female).
- This arrangement also prevents self-fertilization and promotes cross-pollination.

4. **Examples of Plant B**:
- An example of plant B is the Castor plant. Castor produces separate male and female flowers, ensuring that pollination occurs between different flowers rather than within the same flower.

5. **Conclusion**:
- Based on the characteristics described, plant A corresponds to a plant with stamens and carpels in the same flower but at different positions (like Hibiscus), while plant B corresponds to a plant with separate male and female flowers (like Castor).
- Therefore, the correct classification is:
- Plant A: Hibiscus (stamens and carpels in the same flower)
- Plant B: Castor (stamens and carpels in different flowers)

### Final Answer:
- Plant A is Hibiscus, and Plant B is Castor.