A) Isogametes are similar in structure, function and behaviour
B) An isogametes differ either in structure, function and behaviour
C) In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile
D) Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy
Correct Answer: C
Solution :
Oomycetes (egg fungus) include water moulds, white rusts and downy mildews. In these, female gamete is smaller and motile, whereas male gamete is larger and non-motile. Isogametes are found in algae like Ultrix, Chlamydornonas, Spirogyra, etc., which are similar in structure, function and behavior. An isogametes are found in Chlamydornonas in which one gamete is larger and non-motile and the other one is motile and smaller. Oogamy is the fusion of non-motile egg with motile sperm. The gametes, differ both morphologically as well as physiologically. It occurs in Chlamydomonas, Fucus Chara, Volvox, etc.
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