Biological Classification Chapter-Wise Test 17

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which group of fungi are called ‘imperfect fungi’ due to the absence of a known sexual stage?

Ascomycetes
Phycomycetes
Deuteromycetes
Basidiomycetes
3

Deuteromycetes are called ‘imperfect fungi’ because their sexual stage is either unknown or absent.

Which of the following organisms has a protein-rich pellicle instead of a cell wall?

Diatoms
Euglena
Nostoc
Rhizopus
2

Euglena has a protein-rich pellicle that provides flexibility, unlike other protists that have cell walls.

Which of the following statements about protozoans is incorrect?

Protozoans are unicellular eukaryotic organisms.
Protozoans reproduce only sexually.
Protozoans can be free-living or parasitic.
Protozoans exhibit different types of locomotion.
2

Protozoans reproduce both asexually (binary fission) and sexually, depending on the species.

Which of the following is NOT a characteristic of Kingdom Monera?

Absence of a nuclear membrane
Presence of peptidoglycan cell wall
Membrane-bound organelles
Binary fission as a mode of reproduction
3

Kingdom Monera (bacteria) lacks membrane-bound organelles, unlike eukaryotic cells.

Which of the following is a characteristic of retroviruses?

They contain DNA as genetic material
They use reverse transcriptase to convert RNA to DNA
They lack a protein coat
They are non-infectious
2

Retroviruses, such as HIV, use reverse transcriptase to convert their RNA genome into DNA, which integrates into the host genome.

Which of the following organisms is known for causing red tides in the ocean?

Euglena
Nostoc
Gonyaulax
Paramecium
3

Gonyaulax, a dinoflagellate, is responsible for red tides due to rapid multiplication and toxin release.

Which of the following is a role of fungi in ecosystems?

Producing antibiotics
Fixing atmospheric nitrogen
Performing photosynthesis
Causing red tides
1

Fungi, such as Penicillium, produce antibiotics, which have ecological and medical significance. They do not fix nitrogen, photosynthesize, or cause red tides.

Which of the following groups includes organisms that have silica-embedded cell walls?

Dinoflagellates
Diatoms
Euglenoids
Slime moulds
2

Diatoms have silica-embedded cell walls, making them highly resistant and forming diatomaceous earth.

Which of the following statements about cyanobacteria is incorrect?

Cyanobacteria perform photosynthesis.
Cyanobacteria contain a well-defined nucleus.
Cyanobacteria can fix atmospheric nitrogen.
Cyanobacteria are prokaryotic organisms.
2

Cyanobacteria are prokaryotic and lack a well-defined nucleus.

Which of the following is a characteristic of Mycoplasma?

Presence of a rigid cell wall
Smallest free-living organisms
Perform photosynthesis
Contain peptidoglycan
2

Mycoplasma are the smallest free-living organisms and lack a cell wall, distinguishing them from other bacteria.

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