Question

Select the wrong statement :-

• A. Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.
• B. Isogametes are similar in structure, function and behavior.
• C. Anisogametes differ either in structure, function of behavior
  
• D. In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

Answer 1

The correct option is D In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

Option B is correct, because it is not that in oomycetes, female gamete is smaller and motile, while male gamete is larger and non-motile. It is actually the opposite, i.e., in oomycetes the female gamete is larger and non motile, while the male gamete is smaller and motile.

Anisogametes are opposite of isogametes. These are morphologically as well as physiologically distinctive. Anisogametes are usually represented by female gametes being quite large and have a very different appearance than the male gamete. The anisogametes differ greatly in structure, function, and behaviour.

Isogametes are gametes that have similar morphology and physiology. Isogamy is a type of sexual reproduction that involves isogametes fusion. The isogametes have similar structure, function, and behaviour. Many algal and fungal species exhibit isogamy. Such gametes are found generally in lower or primitive types of organisms.


Chlamydomonas and Fucus are both algae species. Chlamydomonas reproduces both sexually and asexually. Sexual reproduction takes place by isogamy as well as anisogamy. In Fucus, the male gamete is small and the motile and female gamete is the opposite.

So, the correct answer is "option B"