Question

Select the wrong statement

(a) isogametes are similar in structure, function and behaviour

(b) Anisogametes offer 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

Answer 1

Correct option  (c) In oomycetes, female gamete is smaller and motile, while male gamete is larger and non-motile 

Explanation:

Statement (c) is wrong as oomycetes include water moulds, white rusts and downy mildews. In these, female gamete is large and non-motile, whereas, a male gamete is small and non-motile. Isogametes are found in algae like Ulothrix, Chlamydomonas, Spirogyra, etc. which are similar in structure, function and behaviour. Anisogametes are found in Chlamydomonas 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.