Sample Questions — Algae
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MCQ
Why do most red algae reproduce sexually using non-motile gametes?
✅ Correct Answer: B
Red algae are marine and adapted to release non-motile gametes, relying on water for fusion.
MCQ
Which pigment is responsible for the reddish appearance of red algae?
✅ Correct Answer: C
Red algae contain the pigment R-phycoerythrin, which efficiently absorbs blue-green light and gives the algae its distinct red color.
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MCQ
Why are brown algae economically important in the commercial sector?
✅ Correct Answer: A
Brown algae such as Laminaria and Sargassum produce algin, which is used in food and industrial applications.
MCQ
Why are brown algae often seen in temperate marine environments with deep water?
✅ Correct Answer: B
Fucoxanthin is an accessory pigment in brown algae that allows photosynthesis in deeper water.
MCQ
Which among the following green algae is filamentous in structure?
✅ Correct Answer: C
Ulothrix is a filamentous green alga with cells arranged in unbranched chains.
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