Q11. Which of the following types of algae are commonly used in the production of carrageenan?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: a) Red algae
Explanation: Carrageenan, a food additive and thickening agent, is derived from certain species of red algae, particularly from the genera Chondrus and Eucheuma. It is used in various food and pharmaceutical products.
Q12. Which of the following types of algae are commonly used in the production of alginates?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: b) Brown algae
Explanation: Alginates, a group of polysaccharides with various industrial applications, are derived from certain species of brown algae, particularly from the genera Laminaria and Macrocystis.
Q13. Which of the following types of algae are commonly used as bioindicators of water quality?
a) Red algae
b) Brown algae
c) Green algae
d) Diatoms
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Correct Answer: d) Diatoms
Explanation: Diatoms, due to their sensitivity to environmental conditions such as nutrient levels and water pH, are commonly used as bioindicators of water quality in aquatic ecosystems.
Q14. Which of the following types of algae are commonly used in the production of biofuels?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: c) Green algae
Explanation: Certain species of green algae are being investigated for their potential use in the production of biofuels, particularly biodiesel and ethanol, due to their high lipid content and fast growth rates.
Q15. Which of the following types of algae are commonly found in freshwater habitats?
a) Red algae
b) Brown algae
c) Green algae
d) Dinoflagellates
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Correct Answer: c) Green algae
Explanation: Green algae are commonly found in freshwater habitats such as lakes, rivers, and ponds. They exhibit a wide range of morphological and ecological diversity in these environments.
Q16. Which of the following types of algae are characterized by their filamentous structure?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: d) Blue-green algae
Explanation: Blue-green algae, also known as cyanobacteria, are characterized by their filamentous structure, which consists of chains of cells. They are often found in colonies or mats in various aquatic habitats.
Q17. Which of the following types of algae are commonly found in symbiotic relationships with fungi?
a) Red algae
b) Brown algae
c) Green algae
d) Lichen algae
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Correct Answer: d) Lichen algae
Explanation: Lichen algae form symbiotic relationships with fungi to create lichens, composite organisms that are able to colonize diverse habitats, including rocks, trees, and soil.
Q18. Which of the following types of algae are commonly used in the production of agarwood, a valuable aromatic resin?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: d) Blue-green algae
Explanation: Certain species of blue-green algae are involved in the production of agarwood, also known as oud, through a complex interaction with host trees. Agarwood is highly valued for its fragrance and is used in perfumes and incense.
Q19. Which of the following types of algae are commonly used in the production of sushi wrappers?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: a) Red algae
Explanation: Nori, a type of edible seaweed used as a wrapping for sushi and other Japanese dishes, is derived from certain species of red algae, particularly from the genus Porphyra.
Q20. Which of the following types of algae are commonly found in symbiotic relationships with fungi to form mycorrhizae?
a) Red algae
b) Brown algae
c) Green algae
d) Blue-green algae
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Correct Answer: c) Green algae
Explanation: Certain species of green algae form symbiotic relationships with fungi to create mycorrhizae, which are associations between plant roots and fungi that enhance nutrient uptake and plant growth.