Class XI · Biology practice

Biological Classification MCQs

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300 questions in this collection · Page 12 of 30

Question 111 of 300

📘 CLASS XI

Biological Classification

The boundaries of which of the following kingdoms are considered "not well defined" by biologists?

The boundaries of Kingdom Protista are not well defined, and different biologists may classify some organisms differently.

Question 112 of 300

📘 CLASS XI

Biological Classification

Chrysophytes, which float passively in water currents, are ecologically categorised as:

Chrysophytes such as diatoms and golden algae float passively in water currents and are collectively called plankton.

Question 113 of 300

📘 CLASS XI

Biological Classification

The indestructible nature of diatom cell walls leads to the massive accumulation of:

Diatom cell walls contain silica and accumulate over billions of years to form diatomaceous earth.

Question 114 of 300

📘 CLASS XI

Biological Classification

Most dinoflagellates possess two flagella arranged in which specific orientation?

Most dinoflagellates possess two flagella, one longitudinal and the other transverse within a furrow.

Question 115 of 300

📘 CLASS XI

Biological Classification

Euglenoids exhibit a unique mixotrophic nutrition. When deprived of sunlight, they:

Euglenoids become heterotrophic in the absence of sunlight and feed on smaller organisms.

Question 116 of 300

📘 CLASS XI

Biological Classification

Slime moulds are saprophytic protists. Under suitable conditions, they aggregate to form a structure called a:

Under favourable conditions slime moulds aggregate to form a multinucleate plasmodium.

Question 117 of 300

📘 CLASS XI

Biological Classification

Which group of protozoans features marine forms that typically have protective silica shells on their surface?

Marine amoeboid protozoans possess protective silica shells.

Question 118 of 300

📘 CLASS XI

Biological Classification

Trypanosoma, which causes sleeping sickness, belongs to which group of protozoans?

Trypanosoma is a flagellated protozoan responsible for sleeping sickness.

Question 119 of 300

📘 CLASS XI

Biological Classification

The coordinated movement of thousands of cilia helps Paramoecium steer food directly into its:

Food-laden water is directed into the gullet by coordinated ciliary movement.

Question 120 of 300

📘 CLASS XI

Biological Classification

Which kingdom is composed exclusively of heterotrophic organisms that exhibit a great diversity in morphology and habitat, and prefer warm, humid places?

Kingdom Fungi consists entirely of heterotrophic organisms and generally prefers warm, humid habitats.

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