Biological Classification MCQs with Explanations
Below are some MCQs with answers and short explanations. These will help you understand the chapter better.
Q1. Class sporozoa of phylum protozoa is characterized by:
A. flagella
B. cilia
C. pseudopodia
D. infectious spores-like stage
Answer: D
Explanation: Sporozoans are non-motile protozoans that form spores. These spores help in infection and transmission, making this class unique.
Q2. Which of the following is incorrect for Nostoc?
A. Heterocystous cyanobacteria
B. Presence of mucilagenous sheath
C. Presence of flagella
D. Fixes atmospheric nitrogen
Answer: C
Explanation: Nostoc is a cyanobacterium that fixes nitrogen and has a mucilaginous sheath. It lacks flagella, so option C is incorrect.
Q3. The algal component of lichen is known as A and fungal component as B. Identify A and B, respectively.
A. A-mycobiont, B-phycobiont
B. A-mycobiont, B-symbiont
C. A-phycobiont, B-mycobiont
D. A-symbiont, B-phycobiont
Answer: C
Explanation: In lichens, the algal part is called phycobiont and the fungal part is mycobiont. They live together in a symbiotic relationship.
Q4. Cr -Jacob disease (CJD) in humans is caused by:
A. viruses
B. prions
C. viroids
D. protozoans
Answer: B
Explanation: CJD is a brain disease caused by prions, which are proteins that fold incorrectly. They do not have DNA or RNA.
Q5. Which of the following pairs is not correctly matched?
A. Golden algae - Chrysophytes
B. Amoeba - Protozoan
C. Claviceps - Ascomycetes
D. Albugo - Deuteromycetes
Answer: D
Explanation: Albugo actually belongs to the group oomycetes, not deuteromycetes, making it mismatched.
Q6. Match List-I with List-II:
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List I
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List II
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A. Amoeboid protozoan
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I. Plasmodium
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B. Ciliated protozoan
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II. Trypanosoma
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C. Sporozoan
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III. Entamoeba
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D. Flagellated protozoan
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IV. Paramoecium
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Answer: C
Explanation: Each protozoan type is matched with its example. Amoeboid (Entamoeba), ciliated (Paramoecium), sporozoan (Plasmodium), flagellated (Trypanosoma).
Q7. How many statements are correct for the Kingdom-Monera?
I. Includes unicellular, colonial and filamentous prokaryotes.
II. Bacteria reproduce only by fission.
III. Nutritionally monerans are only photoautotrophs and saprophytes.
IV. Some of the monerans can cause disease like Cholera, typhoid, tetanus etc.
A. All are correct.
B. , II and III are correct.
C. Only I is correct.
D. I and IV are correct.
Answer: D – I and IV are correct.
Explanation: Monerans include unicellular prokaryotes and some cause diseases. But they are nutritionally diverse and don’t only reproduce by fission.
Q8. Match List-I with List-II:
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List I
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List II
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A. Phycomycetes
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I. Mycelium is branched and septate
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B. Ascomycetes
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II. Mycelium is aseptate and coenocytic
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C. Entamoeba
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III. Saprophytic protist
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D. Slime mould
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IV. Parasitic protozoan
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Choose the correct answer from the options given below:
A. A-II, B-I, C-III, D-IV
B. A-I, B-II, C-III, D-IV
C. -II, B-I, C-IV, D-III
D. A-I, B-II, C-IV, D-III
Answer: C
Explanation: Each organism matches with its correct type and characteristics. Slime moulds are saprophytic protists, not true fungi.
Q9. Choose correct option for the organism given:
I. Possess gullet
II. Food steered into gullet
III. Aquatic, passively moving
IV. Form infectious spore
Answer: B. III and IV only
Explanation: The organism is likely a sporozoan which is aquatic and forms spore-like structures. It does not use a gullet for feeding.
Q10. Given below are two statements:
Statement I: No virus contains both RNA and DNA.
Statement II: A virus is a nucleoprotein and the genetic material is infectious.
In the light of above statements, choose the most appropriate answer from the options given below:
A. Statement I is correct but Statement II is incorrect.
B. Statement I is incorrect but Statement II is correct.
C. Both Statement I and Statement II are correct.
D. Both Statement I and Statement II are incorrect.
Answer: C. Both Statement I and Statement II are correct.
Explanation: Viruses have either RNA or DNA, not both. They are nucleoproteins with infectious genetic material.
Q11. Choose the correct option w.r.t. TMV:
A. Capsomeres are arranged in polyhedral form
B. Possess non-infectious RNA
C. Beijerinek found that they pass through bacteria-proof filters
D. Single stranded RNA is present.
Answer: D
Explanation: TMV has single-stranded RNA and Beijerinek studied its filtration, but the capsomeres are helically arranged, not polyhedral.
Q12. Find the mismatched pair:
A. Prions – Abnormally folded protein
B. Viruses – Non-cellular organisms
C. Bacteriophages – Viruses that infect plants
D. Viroids – Smaller than viruses
Answer: C
Explanation: Bacteriophages infect bacteria, not plants. So this pair is mismatched.
Q13. Fusion of protoplasms between gametes is called:
A. plasmogamy
B. karyogamy
C. dikaryon
D. dikaryophase
Answer: A
Explanation: Plasmogamy is the fusion of the cell membranes or protoplasms of gametes. It is the first step in fungal reproduction.
Q14. Identify A, B and C in the diagram:
A. - Cell wall, B - Cell membrane, C Heterocyst
B. A - Cell wall, B - Cell membrane, C - DNA
C. A - Mucilagenous sheath, B - Cell membrane, C-DNA.
D. A - Cell membrane, B - Cell wall, C - DNA
Answer: B
Explanation: In bacteria, the outermost layer is the cell wall, followed by the membrane. Inside is the DNA. So A–Cell wall, B–Membrane, C–DNA.
Q15. Choose odd one out w.r.t. dinoflagellates:
A. Mostly fresh water
B. Stiff cellulosic plates
C. Two different flagella
D. Some cause red tides
Answer: A
Explanation: Most dinoflagellates are marine, not freshwater. So this option is the odd one.
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