Question

Identify the correct statements related to the class Phaeophyceae. \[ \begin{aligned} A. &\text{Asexual reproduction occurs usually by biflagellate zoospores}\\ B. &\text{Sexual reproduction is by oogamous method only}\\ C. &\text{Food is stored as simple carbohydrates in the form of mannitol or laminarin}\\ D. &\text{Major pigments are chlorophyll }a,c,\text{ xanthophylls and carotenoids}\\ E. &\text{Cellulose cell wall has outer gelatinous coating of algin} \end{aligned} \] The correct answer is (any three)

• A. A, B, C and D only
• B. B, C, D and E only
• C. A, D and E only
• D. A, B, C and E only

Hint:

Important features of Phaeophyceae: \[ \boxed{ \begin{aligned} &\text{Pigments: Chlorophyll }a,c,\text{ fucoxanthin} &\text{Reserve food: Mannitol and laminarin} &\text{Cell wall: Cellulose + algin} &\text{Zoospores: Biflagellate} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Examine each statement. Statement A is correct. Brown algae reproduce asexually by \[ \boxed{\text{biflagellate zoospores}.} \] Statement B is incorrect. Sexual reproduction may be \[ \boxed{\text{isogamous, anisogamous or oogamous}.} \] It is not only oogamous. Statement C is incorrect. Food is stored as \[ \boxed{\text{mannitol and laminarin}} \] which are reserve food materials and not simple carbohydrates. Statement D is correct. Major pigments are \[ \boxed{\text{chlorophyll }a,\;c,\;\text{xanthophylls and carotenoids}.} \] Statement E is correct. The cell wall consists of cellulose with an outer gelatinous coating of \[ \boxed{\text{algin}.} \]

Step 2: Choose the correct statements. Hence, the correct statements are \[ \boxed{\text{A, D and E only}.} \] Therefore, the correct option is \[ \boxed{(C).} \]