Question

Heterosporous pteridophytes (e.g., Selaginella) always produce ................ gametophytes

• A. Monoecious
• B. Dioecious
• C. Homothallic
• D. None of the above

Answer 1

The correct option is B Dioecious

Heterosporous pteridophytes (e.g., Selaginella) always produce dioecious gametophytes. A heterosporous life history occurs in some pteridophytes and in all seed plants. It is characterized by morphologically dissimilar spores produced from two types of sporangia: microspores, or male spores, and megaspores (macrospores), or female spores. In pteridophytes, megaspores are typically larger than microspores, but the opposite is true in most seed plants.