Which one of the following statements is wrong?
Answer: (B) Algin is obtained from red algae, and carrageenan from brown algae. Answer: (B) Algin is obtained from red algae, and carrageenan from brown algae.
- A.Algae increase the level of dissolved oxygen in the immediate environment
- B.Algin is obtained from red algae, and carrageenan from brown algae✓
- C.Agar - agar is obtained from Gelidium and Gracilaria
- D.Laminaria and Sargassum are used as food
Correct Answer
(B) Algin is obtained from red algae, and carrageenan from brown algae
Solution & Explanation
Answer: (B) Algin is obtained from red algae, and carrageenan from brown algae. Solution: This is the WRONG statement, hence the correct choice. NCERT clearly states the opposite: algin is obtained from BROWN algae and carrageen (carrageenan) from RED algae. The other statements are all true — algae are photosynthetic and raise dissolved oxygen, agar is obtained from Gelidium and Gracilaria, and Laminaria and Sargassum are used as food. NCERT Reference: Class XI Biology, Plant Kingdom, p.26, lines 10-13 — "produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially. Agar, one of the commercial products obtained from Gelidium and Gracilaria".