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Biological-Classification MCQs
Class XI Biology
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NCERT Based
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NEET Practice
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300 questions in this chapter
Question 111 of 300
📘 CLASS XI
The boundaries of which of the following kingdoms are considered "not well defined" by biologists?
A Monera B Protista C Fungi D Animalia
Show explanation
The boundaries of Kingdom Protista are not well defined, and different biologists may classify some organisms differently.
Question 112 of 300
📘 CLASS XI
Chrysophytes, which float passively in water currents, are ecologically categorised as:
A Benthos B Plankton C Nekton D Parasites
Show explanation
Chrysophytes such as diatoms and golden algae float passively in water currents and are collectively called plankton.
Question 113 of 300
📘 CLASS XI
The indestructible nature of diatom cell walls leads to the massive accumulation of:
A Red tides B Algal blooms C Diatomaceous earth D Slime moulds
Show explanation
Diatom cell walls contain silica and accumulate over billions of years to form diatomaceous earth.
Question 114 of 300
📘 CLASS XI
Most dinoflagellates possess two flagella arranged in which specific orientation?
A Both at the anterior end B One longitudinally and the other transversely in a furrow between wall plates C Distributed evenly over the entire cell surface D Both at the posterior end
Show explanation
Most dinoflagellates possess two flagella, one longitudinal and the other transverse within a furrow.
Question 115 of 300
📘 CLASS XI
Euglenoids exhibit a unique mixotrophic nutrition. When deprived of sunlight, they:
A Synthesise their own food via chemosynthesis B Behave like heterotrophs by predating on smaller organisms C Form parasitic relationships with plants D Absorb dead organic matter as saprophytes
Show explanation
Euglenoids become heterotrophic in the absence of sunlight and feed on smaller organisms.
Question 116 of 300
📘 CLASS XI
Slime moulds are saprophytic protists. Under suitable conditions, they aggregate to form a structure called a:
A Mycelium B Fruiting body C Plasmodium D Pellicle
Show explanation
Under favourable conditions slime moulds aggregate to form a multinucleate plasmodium.
Question 117 of 300
📘 CLASS XI
Which group of protozoans features marine forms that typically have protective silica shells on their surface?
A Flagellated protozoans B Ciliated protozoans C Sporozoans D Amoeboid protozoans
Show explanation
Marine amoeboid protozoans possess protective silica shells.
Question 118 of 300
📘 CLASS XI
Trypanosoma, which causes sleeping sickness, belongs to which group of protozoans?
A Amoeboid protozoans B Flagellated protozoans C Ciliated protozoans D Sporozoans
Show explanation
Trypanosoma is a flagellated protozoan responsible for sleeping sickness.
Question 119 of 300
📘 CLASS XI
The coordinated movement of thousands of cilia helps Paramoecium steer food directly into its:
A Pseudopodia B Food vacuole C Gullet D Plasmodium
Show explanation
Food-laden water is directed into the gullet by coordinated ciliary movement.
Question 120 of 300
📘 CLASS XI
Which kingdom is composed exclusively of heterotrophic organisms that exhibit a great diversity in morphology and habitat, and prefer warm, humid places?
A Protista B Fungi C Monera D Plantae
Show explanation
Kingdom Fungi consists entirely of heterotrophic organisms and generally prefers warm, humid habitats.
