NEET Biology Biological Classification MCQs Set 12

Practice MCQs for NEET Biology Biological Classification

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Access the complete set of multiple-choice questions for Biological Classification below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official NEET textbooks.

Multiple Choice Questions

Question 1: Select the INCORRECT statement about viroids:
(a) They are free infectious RNA
(b) They were discovered by T.O. Diener
(c) They cause potato spindle tuber disease
(d) They contain high molecular weight RNA
Show Answer & Explanation

Answer: (d) They contain high molecular weight RNA

Explanation:
1. Viroids are free RNA of low molecular weight, discovered by Diener, and cause potato spindle tuber disease.

Teacher's Note:
1. Viroids lack a protein coat.

Question 2: Generally, plant viruses are:
(a) Double-stranded DNA viruses
(b) Single-stranded RNA viruses
(c) Single-stranded DNA viruses
(d) Double-stranded RNA viruses
Show Answer & Explanation

Answer: (b) Single-stranded RNA viruses

Explanation:
1. Most plant viruses have single-stranded RNA, e.g
2. TMV.

Teacher's Note:
1. Bacteriophages are double-stranded DNA viruses.

Question 3: Which of the following are NOT included in the five kingdom system? (a) Viruses (b) Viroids (c) Lichens (d) Prions
(a) Only a and b
(b) Only b, c and d
(c) Only a and c
(d) All a, b, c and d
Show Answer & Explanation

Answer: (d) All a, b, c and d

Explanation:
1. Viruses, viroids, prions and lichens (a symbiotic association) are not placed in any of the five kingdoms.

Teacher's Note:
1. These are acellular or non-organismal categories.

Question 4: Select the INCORRECT statement:
(a) W.M. Stanley showed that viruses could be crystallised
(b) Besides a protein coat, viruses contain genetic material that may be RNA or DNA
(c) The small subunits of the capsid are called capsomeres
(d) The small subunits of the capsid are called peplomers
Show Answer & Explanation

Answer: (d) The small subunits of the capsid are called peplomers

Explanation:
1. Capsid subunits are capsomeres
2. Peplomers are spikes on an envelope.

Teacher's Note:
1. Capsomeres build the capsid.

Question 5: Find the WRONG statement about kingdom Fungi as proposed by Whittaker:
(a) Eukaryotic organisms
(b) Chitinous cell wall
(c) Multicellular with distinct tissue systems
(d) Heterotrophic (saprophytic or parasitic) nutrition
Show Answer & Explanation

Answer: (c) Multicellular with distinct tissue systems

Explanation:
1. Fungi have no true tissue organisation, only a mycelium of hyphae.

Teacher's Note:
1. Fungi lack tissues and organs.

Question 6: Members of Protista are primarily:
(a) Terrestrial
(b) Aquatic
(c) Saprophytic
(d) Epiphytic
Show Answer & Explanation

Answer: (b) Aquatic

Explanation:
1. Protists are mainly aquatic.

Teacher's Note:
1. Protista forms a link between prokaryotes and higher kingdoms.

Question 7: Which kingdom forms a link with plants, animals and fungi?
(a) Monera
(b) Protista
(c) Plantae
(d) Fungi
Show Answer & Explanation

Answer: (b) Protista

Explanation:
1. Protista is the first eukaryotic kingdom and connects with Plantae, Animalia and Fungi.

Teacher's Note:
1. Unicellular eukaryotes gave rise to the other eukaryotic kingdoms.

Question 8: Chrysophytes include:
(a) Diatoms
(b) Dinoflagellates
(c) Desmids
(d) Both diatoms and desmids
Show Answer & Explanation

Answer: (d) Both diatoms and desmids

Explanation:
1. Chrysophytes include diatoms and golden algae (desmids).

Teacher's Note:
1. They are mostly photosynthetic and form phytoplankton.

Question 9: The toxins released by which group of protists kill fishes and other marine animals?
(a) Chrysophytes
(b) Dinoflagellates
(c) Desmids
(d) Euglenoids
Show Answer & Explanation

Answer: (b) Dinoflagellates

Explanation:
1. During red tides, toxins released by rapidly multiplying dinoflagellates kill marine animals.

Teacher's Note:
1. Red tide is caused by dinoflagellate blooms.

Question 10: In the absence of sunlight, which protists behave like heterotrophs by preying on smaller organisms?
(a) Slime moulds
(b) Protozoans
(c) Euglenoids
(d) Dinoflagellates
Show Answer & Explanation

Answer: (c) Euglenoids

Explanation:
1. Euglenoids are photosynthetic in sunlight, but in its absence they become heterotrophs by predating on smaller organisms.

Teacher's Note:
1. Euglena is a connecting link between plants and animals.

Question 11: Which group of organisms shows great diversity in morphology and habitat?
(a) Chrysophytes
(b) Dinoflagellates
(c) Protozoan protists
(d) Fungi
Show Answer & Explanation

Answer: (d) Fungi

Explanation:
1. Fungi show great diversity in morphology and habitat.

Teacher's Note:
1. Fungi range from yeast to mushrooms and occur in many habitats.

Question 12: On the basis of the intervening dikaryotic stage, which fungal group is the odd one?
(a) Phycomycetes
(b) Basidiomycetes
(c) Ascomycetes
(d) Club fungi
Show Answer & Explanation

Answer: (a) Phycomycetes

Explanation:
1. Ascomycetes and basidiomycetes (club fungi) have a dikaryophase between plasmogamy and karyogamy
2. Phycomycetes do not.

Teacher's Note:
1. Basidiomycetes are also called club fungi.

Question 13: Kingdom Fungi is divided into classes on various parameters EXCEPT:
(a) Morphology of mycelium
(b) Mode of spore formation
(c) Dikaryophase
(d) Fruiting body
Show Answer & Explanation

Answer: (c) Dikaryophase

Explanation:
1. The classes are based on mycelium morphology, mode of spore formation and fruiting bodies.

Teacher's Note:
1. Learn these three criteria.

Question 14: Which is NOT applicable to Phycomycetes?
(a) Obligate parasites on plants
(b) Found in moist and damp places
(c) Septate, coenocytic mycelium
(d) Endogenously produced spores
Show Answer & Explanation

Answer: (c) Septate, coenocytic mycelium

Explanation:
1. Phycomycetes mycelium is aseptate and coenocytic, so septate is wrong.

Teacher's Note:
1. Septate and coenocytic cannot go together.

Question 15: In which class of fungi are sex organs generally absent and plasmogamy brought about by fusion of two vegetative cells of different strains?
(a) Phycomycetes
(b) Ascomycetes
(c) Basidiomycetes
(d) Deuteromycetes
Show Answer & Explanation

Answer: (c) Basidiomycetes

Explanation:
1. In Basidiomycetes there are no sex organs; somatic cells of different strains fuse.

Teacher's Note:
1. Basidiomycetes form basidiospores exogenously on basidia.

Question 16: When the perfect (sexual) stage of Deuteromycetes is discovered, they are moved to:
(a) Phycomycetes
(b) Ascomycetes only
(c) Basidiomycetes only
(d) Either Ascomycetes or Basidiomycetes
Show Answer & Explanation

Answer: (d) Either Ascomycetes or Basidiomycetes

Explanation:
1. Fungi imperfecti are shifted to Ascomycetes or Basidiomycetes once a sexual stage is found.

Teacher's Note:
1. Deuteromycetes is a temporary group.

Question 17: The majority of members of Deuteromycetes are:
(a) Autotrophs
(b) Parasites
(c) Decomposers
(d) Symbiotic
Show Answer & Explanation

Answer: (c) Decomposers

Explanation:
1. Most deuteromycetes act as saprophytes or parasites, with the majority being decomposers of litter.

Teacher's Note:
1. They help in mineral cycling.

Question 18: Match the scientist with the contribution. a. D.J. Ivanowsky b. Beijerinck c. W.M. Stanley d. T.O. Diener; i. Discovery of viroids ii. Crystallisation of virus iii. Contagium vivum fluidum iv. Discovery of TMV
(a) a(iv), b(iii), c(ii), d(i)
(b) a(iv), b(iii), c(i), d(ii)
(c) a(iii), b(iv), c(ii), d(i)
(d) a(ii), b(iii), c(iv), d(i)
Show Answer & Explanation

Answer: (a) a(iv), b(iii), c(ii), d(i)

Explanation:
1. Ivanowsky found that sap of diseased tobacco carried the agent (TMV)
2. Beijerinck called it contagium vivum fluidum
3. Stanley crystallised it and Diener discovered viroids.

Teacher's Note:
1. Learn this historical order of virus discoveries.

Question 19: When a virus attacks a plant, which of the following symptoms does NOT appear?
(a) Gall formation
(b) Mosaic formation
(c) Leaf rolling and curling
(d) Yellowing and vein clearing
Show Answer & Explanation

Answer: (a) Gall formation

Explanation:
1. Viruses cause mosaics, leaf rolling and curling, yellowing and vein clearing, dwarfing and necrosis
2. Galls are caused by bacteria and other agents.

Teacher's Note:
1. Agrobacterium causes crown gall.

Question 20: Which is a characteristic of viroids?
(a) They are larger than viruses
(b) They have free infectious DNA
(c) They have free infectious RNA
(d) They have high molecular weight RNA
Show Answer & Explanation

Answer: (c) They have free infectious RNA

Explanation:
1. Viroids are free infectious RNA of low molecular weight, smaller than viruses.

Teacher's Note:
1. They lack a protein coat.

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NEET Biology Biological Classification Objective Test Questions

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