Correct Option: B. Rice Detailed Explanation: Swampy lands, also known as wetlands or marshy areas, are characterized by their high moisture content and often waterlogged conditions. These environments are typically rich in organic matter and nutrients, making them suitable for certain types of crops.

1. Water Requirements: Rice (Oryza sativa) is a semi-aquatic plant that thrives in flooded conditions. It requires a significant amount of water for optimal growth, which is why it is commonly grown in paddy fields that are intentionally flooded. The water helps to suppress weeds and pests, providing a more favorable environment for rice cultivation.
2. Soil Conditions: The soil in swampy areas is often clayey and retains water well, which is ideal for rice cultivation. Rice plants have specialized structures called aerenchyma that allow them to transport oxygen to their roots even when submerged, making them uniquely adapted to these conditions.
3. Nutrient Availability: Swampy lands are typically rich in nutrients due to the decomposition of organic matter. This nutrient-rich environment supports the growth of rice, which is a heavy feeder and requires ample nutrients to produce high yields.
4. Cultural Practices: Farmers in regions with swampy lands often use traditional methods of rice cultivation, such as transplanting seedlings into flooded fields. This practice not only takes advantage of the waterlogged conditions but also helps in managing pests and diseases.

Why Other Options Are Incorrect:

• A. Yam:
• Yams (Dioscorea spp.) prefer well-drained soils and do not thrive in waterlogged conditions. They require a dry period for tuber development, which is contrary to the continuous wet conditions of swampy lands. While yams can tolerate some moisture, excessive water can lead to rot and poor yields.
• C. Maize:
• Maize (Zea mays) is a drought-resistant crop that prefers well-drained soils. It does not perform well in waterlogged conditions, as excess water can lead to root rot and other diseases. Maize requires a balance of moisture but cannot tolerate the prolonged flooding that swampy lands experience.
• D. Tomato:
• Tomatoes (Solanum lycopersicum) also prefer well-drained soils and can suffer from root diseases if their roots are submerged in water for extended periods. While they need consistent moisture, they do not thrive in swampy conditions where waterlogging is prevalent.

Summary of Key Points:

• Rice is the most suitable crop for swampy lands due to its ability to grow in flooded conditions and its specialized adaptations for oxygen transport.
• Yams, maize, and tomatoes are not suited for swampy conditions as they prefer well-drained soils and can suffer from waterlogging.
• Swampy lands provide nutrient-rich environments, which are beneficial for rice cultivation but detrimental for other crops that require different soil conditions.
• Understanding the specific needs of crops is crucial for successful agricultural practices, especially in unique environments like swampy lands.