Question

Sexual reproduction in Thallophyta takes place by:

• A. Isogamy
• B. Anisogamy
• C. Oogamy
• D. Any of the above

Answer 1

Answer: (D)

• Thallophyta reproduces sexually when gametes fuse to form a zygote. There are three types of sexual reproduction on the basis of morphological and physiological behavior of gametes.

• Isogamous: both the gametes are morphologically and physiologically similar and their fusion is called isogamy.
• Anisogamous: The microgamete is smaller and more active, whereas the female gamete is larger and sluggish and their fusion is called anisogamy.
• Oogamous: female gamete is large and nonmotile and male gamete is small and motile and their fusion is called oogamy.
• Thus, the correct answer is option D.