MCQ on Red Algae with Answers

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MCQ on Red Algae with Answers

1. A red algae that are not red is______
(a) Polysiphonia
(b) Batrachospermum
(c) Gracilaria
(d) None of these
Answer: (b)
Explanation: Batrachospermum is a freshwater red alga, but unlike most red algae, it appears bluish-green due to the lesser dominance of the red pigment phycoerythrin.

2. Rhodophyta are commonly called red algae because of the predominance of the________
(a) red pigment, r-phycoerythrin in their body
(b) red pigment, c-phycoerythrin in their body
(c) red pigment, r-phycocyanin in their body
(d) red pigment, c-phycocyanin in their body
Answer: (c)
Explanation: The red coloration in Rhodophyta is due to r-phycocyanin, a phycobiliprotein that masks the green of chlorophyll.

3. Majority of the red algae are with greater concentrations found in the_______
(a) Freshwater, colder areas
(b) Marine, warmer areas
(c) Marine, colder areas
(d) Fresh water, warmer areas
Answer: (d)
Explanation: Most red algae thrive in marine environments, but those found in freshwater are generally concentrated in warmer areas.

4. Select an incorrect statement about red algae_______
(a) Sexual reproduction is isogamous and accompanied by complex post-fertilization developments
(b) Sexual reproduction is oogamous and accompanied by simple post-fertilization developments
(c) Sexual reproduction is isogamous and accompanied by simple post-fertilization embryogeny
(d) Sexual reproduction is oogamous and fertilisation is accompanied by complex embryogeny
Answer: (a)
Explanation: Red algae typically exhibit oogamous reproduction (fusion of dissimilar gametes), and fertilization is followed by complex post-fertilization development. Statement (a) is incorrect as it refers to isogamy.

5. Select a correct statement about red algae?
(a) The red algae usually reproduce vegetatively by budding
(b) The red algae usually reproduce vegetatively by fragmentation
(c) The red algae usually reproduce vegetatively by gemmae
(d) The red algae usually reproduce vegetatively by zoospores
Answer: (b)
Explanation: Vegetative reproduction in red algae commonly occurs by fragmentation, where parts of the thallus break off and grow into new organisms.

6. Which of the following are not red algae?
(a) Gracilaria, Gelidium
(b) Ectocarpus, Dictyota
(c) Porphyra, Gracilaria
(d) Polysiphonia, Porphyra
Answer: (b)
Explanation: Ectocarpus and Dictyota belong to brown algae (Phaeophyceae), not red algae.

7. Select an incorrect statement about red algae__________
(a) They occur in well-lighted regions close to the surface of the water
(b) They occur at great depths in oceans where relatively little light penetrates
(c) The red thalli of most of the red algae are multicellular
(d) None of them have complex body organization
Answer: (c)
Explanation: Option (c) is actually correct, but the question asks for an incorrect statement. So, the incorrect statement is (d) — many red algae do have complex body organization.

8. Select an incorrect statement about red algae?
(a) They reproduce asexually by non-motile spores and sexually by non-motile gametes
(b) The food is stored as Floridian starch which is very similar to amylopectin and glycogen in structure
(c) Sexual reproduction is isogamous and accompanied by complex post-fertilization developments
(d) The red algae usually reproduce vegetatively by fragmentation
Answer: (b)
Explanation: Floridean starch is indeed stored in red algae, but it is not very similar to amylopectin and glycogen structurally—it has a distinctive branching pattern.

9. Select an incorrect statement about red algae__________
(a) They reproduce asexually by motile spores and sexually by non-motile gametes
(b) They reproduce asexually by non-motile spores and sexually by non-motile gametes
(c) They reproduce asexually by non-motile spores and sexually by motile gametes
(d) They reproduce asexually by motile spores and sexually by motile gametes
Answer: (c)
Explanation: Red algae reproduce asexually by non-motile spores and sexually by non-motile gametes. Statement (c) is incorrect as it states motile gametes, which red algae lack.

10. Select a correct statement about red algae?
(a) The food is stored as Floridian starch which is very similar to amylopectin and glycogen in structure
(b) The food is stored as mannitol which is very similar to amylopectin and glycogen in structure
(c) The food is stored as sorbitol which is very similar to amylase and glycogen in structure
(d) The food is stored as starch which is very similar to amylopectin and laminarin in structure
Answer: (a)
Explanation: Red algae store food in the form of Floridean starch, which is similar in structure to amylopectin and glycogen.