Algae — NEET Biology Questions

Practice 20 questions on Algae from Plant kingdom (NCERT Class 11, Chapter 3). Free samples below — get all 20 in the app.

20 Questions Plant kingdom Class 11

Sample Questions — Algae

Try 5 questions below from Algae. Get all 20 in the MedicNEET app.

MCQ
Why do most red algae reproduce sexually using non-motile gametes?
  • A. Because they need to conserve energy for fertilization
  • B. Because they live in environments where water movement facilitates fusion
  • C. Because they are only asexual organisms and don't need motile gametes
  • D. Because they grow only on dry land
✅ 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?
  • A. Phycocyanin
  • B. Fucoxanthin
  • C. phycoerythrin
  • D. Chlorophyll b
✅ Correct Answer: C
Red algae contain the pigment R-phycoerythrin, which efficiently absorbs blue-green light and gives the algae its distinct red color.
👆 Want all 20 Algae questions? Get them in the app. Download MedicNEET →
MCQ
Why are brown algae economically important in the commercial sector?
  • A. They yield hydrocolloids like algin
  • B. They are used for fiber production
  • C. They are used in fossil fuel industries
  • D. They produce wood for paper
✅ 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?
  • A. They require freshwater only
  • B. Fucoxanthin absorbs available light at those depths
  • C. They depend on lichen association
  • D. They do not perform photosynthesis
✅ 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?
  • A. Chlamydomonas
  • B. Volvox
  • C. Ulothrix
  • D. Chlorella
✅ Correct Answer: C
Ulothrix is a filamentous green alga with cells arranged in unbranched chains.

Practice All 20 Questions from Algae

You've seen 5 sample questions. Get all 20 with detailed NCERT-mapped explanations in the MedicNEET app.

📲 Download MedicNEET Free
Available on Android • 12,771 Biology Questions • 3 Formats
📲 Download MedicNEET — 12,771 Biology Questions