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NEET Biology MCQ
Quiz 1
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Q.1
Ciliates differ from all other protozoans in
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Using pseudopodia for capturing prey
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Having a contractile vacuole for removing excess water
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Using flagella for locomotion
0%
Having two types of nuclei
Explanation
Ciliates (e.g. Paramecium) are unique among protozoans in having two kinds of nuclei in the same cell — a larger macronucleus (for everyday metabolic functions) and one or more smaller micronuclei (involved in reproduction).
Q.2
In which group of organisms the cell walls form to thin overlapping shells which fit together
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Chrysophytes
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Euglenoids
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Dinoflagellates
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Slime moulds
Explanation
This describes diatoms, which belong to the Chrysophytes (Chrysophyceae) — their cell walls are made of silica and form two thin, overlapping shells (like the two halves of a soap box) that fit together.
Q.3
Protozoan with helicopodia is
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Actinophrys
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Euglypha
0%
Entamoeba
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Elphidium
Explanation
Actinophrys is a heliozoan protozoan — heliozoans extend thin, needle-like pseudopodia (axopodia) radiating outward from the cell surface, which is what is being referred to here.
Q.4
Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom
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Animalia
0%
Monera
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Protista
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Fungi
Explanation
Chrysophytes, euglenoids, dinoflagellates and slime moulds are all grouped together in Kingdom Protista.
Q.5
Unicellular Eukaryotic organisms are placed in Kingdom
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Animalia
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Protista
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Monera
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Fungi
Explanation
Kingdom Protista is defined to include all unicellular eukaryotic organisms — those with a true, membrane-bound nucleus but a single-celled body plan.
Q.6
Diatoms are placed under
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Euglenoids
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Slime mould
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Dinoflagellate
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Chrysophytes
Explanation
Correction: diatoms are placed under the Chrysophytes (Chrysophyceae) — not Euglenoids. This is the same group referenced in the earlier question about organisms whose cell walls form two overlapping shells (diatoms are exactly that group). Euglenoids are a distinct group (e.g. Euglena) with a protein-rich pellicle instead of a rigid cell wall, and are unrelated to diatoms. (The option marked correct for this question in the source data appears to be a data-entry error.)
Q.7
Contractile vacuole does not occur in
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Slime Moulds
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Sporozoa
0%
Zooflagellata
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Sarcodina
Explanation
Contractile vacuoles pump out excess water that enters a cell by osmosis — mainly needed by free-living protozoans in freshwater. Sporozoa (e.g. Plasmodium) are parasitic, living inside a host's body fluids where this osmotic problem doesn't arise the same way, so they typically lack contractile vacuoles.
Q.8
Thalloid body of Slime Mould is
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Protonema
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Fruiting body
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Plasmodium
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Mycelium
Explanation
The vegetative, moving, multinucleate mass that makes up the thalloid body of a slime mould is called a plasmodium.
Q.9
The vector for Kala- Azar is
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Culex
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Aedes
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Anopheles
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Phlebotomus
Explanation
Kala-azar (visceral leishmaniasis) is transmitted by the bite of the sandfly, Phlebotomus. (Culex, Aedes and Anopheles are mosquito vectors for other diseases — filariasis, dengue/chikungunya, and malaria respectively.)
Q.10
Some stages of plasmodium vivax may remain dormant in the liver for a long time. On reactivation, the parasite undergoes
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Gametogony
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Cycles of Ross
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Erythrocytic schizogony
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Exoerythrocytic schizogony
Explanation
Dormant liver-stage forms of Plasmodium vivax, on reactivating, undergo exoerythrocytic schizogony — schizogony (multiple fission) occurring in liver cells, i.e. outside red blood cells ("exo-erythrocytic"), as opposed to erythrocytic schizogony, which happens later inside red blood cells.
Q.11
Which of the following is a flagellated protozoans
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Amoeba
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Paramecium
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Entamoeba
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Trypanosoma
Explanation
Trypanosoma moves using flagella, making it a flagellated protozoan. Amoeba and Entamoeba move via pseudopodia, and Paramecium moves via cilia.
Q.12
Which one is not a free living protozoan
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Amoeba
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Euglena
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Noctiluca
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Giardia
Explanation
Giardia is a parasitic protozoan (it lives in the human intestine and causes giardiasis) — unlike Amoeba, Euglena and Noctiluca, which are all free-living.
Q.13
An aggregate of Slime moulds which may grow and spread over several feet is called
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Plasmopara
0%
Plasmodium
0%
Pseudoparenchyma
0%
Mycoplasma
Explanation
The plasmodium is the aggregate, moving mass of a slime mould's vegetative stage — it can grow to cover a considerable area (even several feet) as it creeps over decaying matter.
Q.14
Trypanosoma gambiense produces
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Filaria
0%
Sleeping sickness
0%
Malaria
0%
Kala Azar
Explanation
Trypanosoma gambiense is one of the causative agents of African sleeping sickness (trypanosomiasis).
Q.15
Bioluminescence is found in
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Chlorella
0%
Hirudinaria
0%
Chlamydomonas
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Ceratium
Explanation
Ceratium is a dinoflagellate, and many dinoflagellates (including Ceratium and Noctiluca) are well known for bioluminescence — producing the glowing "sea sparkle" effect seen in disturbed seawater at night.
Q.16
Which one of the following is a Slime mould
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Anabaena
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Rhizopus
0%
Thiobacillus
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Physarum
Explanation
Physarum is a well-known, commonly studied genus of slime mould. (Anabaena is a cyanobacterium, Rhizopus is a fungus, and Thiobacillus is a bacterium.)
Q.17
Naked cytoplasm, multinucleated and saprophytic are the characteristics of
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Slime moulds
0%
Monera
0%
Protista
0%
Fungi
Explanation
Slime moulds (Myxomycetes) have naked cytoplasm (no rigid cell wall in their motile plasmodial stage), are multinucleate, and feed saprophytically on decaying organic matter — all three features together are distinctive of this group.
Q.18
Fusion of two gametes which are dissimilar in size is termed
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Anisogamy
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Isogamy
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Zoogamy
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Oogamy
Explanation
Anisogamy is the fusion of two gametes that are dissimilar in size (as opposed to isogamy, where the fusing gametes look alike).
Q.19
The basis of protozoan classification is
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Locomotion
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Shape
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Measurement
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Number of nuclei
Explanation
Protozoans are traditionally classified based on their mode of locomotion — e.g. Sarcodina (pseudopodia), Zooflagellata (flagella), Ciliophora (cilia), and Sporozoa (non-motile).
Q.20
Black water fever is due to
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Plasmodium falciparum
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Plasmodium ovale
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Plasmodium vivax
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Plasmodium malariae
Explanation
Black water fever — severe intravascular hemolysis leading to dark ("black") urine — is a serious complication specifically associated with Plasmodium falciparum infection, the species responsible for the most severe form of malaria.
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