NEET Exam > NEET Videos > Biology Class 11 > Algae: Phaeophyceae & Rhodophyceae
Algae: Phaeophyceae & Rhodophyceae Video Lecture | Biology Class 11 - NEET
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FAQs on Algae: Phaeophyceae & Rhodophyceae Video Lecture - Biology Class 11 - NEET
| 1. What are the main characteristics of Phaeophyceae (Brown Algae)? |  |
Ans. Phaeophyceae, or Brown Algae, are characterized by their brown or olive-green color due to the presence of a pigment called fucoxanthin. They are multicellular organisms and can grow to be quite large, with some species reaching lengths of over 50 meters. Brown algae are commonly found in marine environments, particularly in colder waters.
| 2. How do Phaeophyceae obtain their energy? | |
Ans. Phaeophyceae obtain their energy through photosynthesis, just like plants. They have specialized structures called chloroplasts, which contain chlorophyll and other pigments necessary for photosynthesis. These algae can also store energy in the form of laminarin, a complex carbohydrate.
| 3. What are the ecological roles of Rhodophyceae (Red Algae)? | |
Ans. Rhodophyceae, or Red Algae, play important ecological roles in marine environments. They are primary producers, meaning they convert sunlight and nutrients into organic matter through photosynthesis. Red algae also provide habitat and food for many marine organisms, including fish, invertebrates, and other algae.
| 4. How do Rhodophyceae differ from Phaeophyceae? | |
Ans. Rhodophyceae differ from Phaeophyceae in several ways. Firstly, they have a red or purplish color due to the presence of pigments called phycoerythrins and phycocyanins. Secondly, red algae are typically smaller and more delicate than brown algae. Lastly, red algae are commonly found in both marine and freshwater environments, while brown algae are mostly restricted to marine habitats.
| 5. Can Phaeophyceae and Rhodophyceae be used for commercial purposes? | |
Ans. Yes, both Phaeophyceae and Rhodophyceae have commercial uses. Brown algae, such as kelp, are used for human consumption, as a source of biofuels, and in the production of various products like cosmetics and fertilizers. Red algae, on the other hand, are used in the food industry as thickeners and stabilizers, and in the production of agar, a gelatinous substance used in laboratories and various food applications.
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Nov 24, 2024 Last updated |
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