Answer:
Sugar cane is not regarded as a stem tuber because it does not possess the characteristics that define a stem tuber. Here are some reasons why:
1. Anatomy:
- Stem tubers, such as potatoes, are swollen, fleshy structures that develop from the underground stems of plants. They store nutrients and energy reserves for the plant's growth and survival.
- Sugar cane, on the other hand, is a tall, grass-like plant with a fibrous root system. It does not have a swollen stem that functions as a storage organ.
2. Purpose and function:
- Stem tubers serve as a means of vegetative reproduction and storage of nutrients. They can give rise to new plants when planted, and the stored nutrients help sustain the plant during periods of dormancy or adverse conditions.
- Sugar cane, however, primarily relies on its roots for nutrient uptake and energy production through photosynthesis. It does not produce stem tubers for propagation or nutrient storage.
3. Growth and development:
- Stem tubers form underground and are usually detached from the parent plant to grow independently.
- Sugar cane, on the other hand, grows above the ground and propagates through seeds or stem cuttings.
In summary, sugar cane is not considered a stem tuber because it lacks the anatomical characteristics, purpose, and growth patterns associated with stem tubers. It is important to understand the specific characteristics and classifications of plants to accurately categorize them.