Which of the following statements about Rhodophyceae is correct?
Certain red algae (Rhodophyceae) produce hydrocolloids like carrageen, used commercially.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Algae - Phaeophyceae and Rhodophyceae
Practice questions covering brown algae (Phaeophyceae) and red algae (Rhodophyceae), including their classification, morphology, and ecological roles.
Filter questions
Which class of algae stores food in the form of laminarin?
Members of Phaeophyceae (brown algae) store food in the form of laminarin and mannitol.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which of the following statements about Phaeophyceae is incorrect?
Phaeophyceae exhibit isogamous, anisogamous, or oogamous sexual reproduction, not only oogamy.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which pigment is responsible for the brown color in Phaeophyceae?
Fucoxanthin, a xanthophyll pigment, gives brown algae their characteristic color.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which of the following is a characteristic feature of brown algae?
Brown algae store food in the form of complex carbohydrates like mannitol and laminarin.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which of the following statements about algae is incorrect?
Only certain brown algae (Phaeophyceae) produce algin, not all algae.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which of the following statements about Phaeophyceae is correct?
The plant body of Phaeophyceae (brown algae) has a holdfast, stipe, and frond, especially in forms like kelps.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which hydrocolloid obtained from brown algae is used commercially in food industries?
Algin, extracted from brown algae (Phaeophyceae), is a hydrocolloid used in food and pharmaceutical industries.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which pigment is absent in brown algae?
Brown algae (Phaeophyceae) contain chlorophyll a, c, and fucoxanthin but lack chlorophyll b.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which of the following statements about Phaeophyceae is correct?
Kelps, which are brown algae (Phaeophyceae), can grow massively, reaching up to 100 meters.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
What is the primary storage product in Phaeophyceae?
The primary storage product in Phaeophyceae (brown algae) is laminarin, a polysaccharide.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Which class of algae produces hydrocolloids like algin?
Phaeophyceae (brown algae) produce hydrocolloids like algin, which are commercially important.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae