Read the following statements and choose the set of correct statements: In the members of Phaeophyceae, A. Asexual reproduction occurs usually by biflagellate zoospores. B. Sexual reproduction is in oogamous method only. C. Stored food is in the form of carbohydrates which is either mannitol or laminarin. D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll. E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin. Choose the correct answer from the options given below:

Solution & Explanation

Answer: (B) A, C, D and E only. Solution: For Phaeophyceae (brown algae): asexual reproduction is by biflagellate zoospores (A correct); stored food is mannitol or laminarin (C correct); pigments are chlorophyll a, c, carotenoids and xanthophylls (D correct); and vegetative cells have a cellulosic wall covered by a gelatinous coating of algin (E correct). Statement B is the WRONG one — sexual reproduction in brown algae may be isogamous, anisogamous OR oogamous, not oogamous only — so the correct set excludes B, giving A, C, D, E. NCERT Reference: Class XI Biology, Plant Kingdom, p.27, lines 9-12 — "Asexual reproduction in most brown algae is by biflagellate zoospores... Sexual reproduction may be isogamous, anisogamous or oogamous.".