Algae — NEET Biology MCQs with Solutions
Free NEET Biology Algae MCQs with step-by-step solutions (6 questions). Part of Plant Kingdom. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Algae · easy · theory
The reserve food material in Chlorophyceae (green algae) is:
A. Glycogen
B. Floridean starch
C. Starch ✓ Correct
D. Mannitol
Solution: Green algae store starch; their major pigments are chlorophyll a and b.
Q2 — Algae · easy · theory
The red colour of Rhodophyceae is due to the pigment:
A. r-phycoerythrin ✓ Correct
B. Fucoxanthin
C. Carotene only
D. Chlorophyll b
Solution: Red algae owe their colour to the predominance of the red pigment r-phycoerythrin.
Q3 — Algae · medium · theory
Brown algae (Phaeophyceae) store food as ______ and their walls contain ______:
A. Glycogen; chitin
B. Starch; cellulose only
C. Laminarin/mannitol; algin ✓ Correct
D. Floridean starch; agar
Solution: Phaeophyceae store laminarin and mannitol; their walls have cellulose coated with algin. Fucoxanthin gives the brown colour.
Q4 — Algae · medium · theory
The commercial products agar, carrageenan are obtained from ______, while algin comes from ______:
A. Green algae; brown algae
B. Green algae; red algae
C. Red algae; brown algae ✓ Correct
D. Brown algae; red algae
Solution: Agar and carrageen are hydrocolloids from red algae; algin is from brown algae (e.g. kelps).
Q5 — Algae · hard · theory
Which pairing of alga and its stored food/pigment is CORRECT?
A. Fucus (Phaeophyceae) — laminarin, fucoxanthin ✓ Correct
B. Polysiphonia — laminarin
C. Ulothrix — floridean starch
D. Chlamydomonas — phycoerythrin
Solution: Fucus is a brown alga storing laminarin with fucoxanthin; the other pairs are mismatched.
Q6 — Algae · hard · theory
Red algae can grow at greater ocean depths than green or brown algae because phycoerythrin:
A. Reflects all light
B. Efficiently absorbs the blue light that penetrates deep water ✓ Correct
C. Requires no light
D. Absorbs only red light
Solution: Phycoerythrin absorbs the blue-green wavelengths that reach depth, letting red algae photosynthesise deeper.