Biological Classifications Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Why are cyanobacteria considered important in agriculture?

They produce antibiotics
They fix atmospheric nitrogen
They increase soil acidity
They act as plant pathogens
2

Cyanobacteria, such as Nostoc and Anabaena, help fix atmospheric nitrogen, enriching soil fertility.

Which of the following statements about cyanobacteria is incorrect?

Cyanobacteria are photosynthetic prokaryotes.
Cyanobacteria lack a nuclear membrane.
Cyanobacteria are classified under Kingdom Protista.
Cyanobacteria can fix atmospheric nitrogen.
3

Cyanobacteria belong to Kingdom Monera, not Protista, as they are prokaryotic organisms.

Which of the following statements about prions is incorrect?

Prions are infectious proteins.
Prions cause neurodegenerative diseases.
Prions contain both DNA and RNA.
Prions lack a cellular structure.
3

Prions are infectious proteins and do not contain any nucleic acids (DNA or RNA).

What structure do slime moulds form under unfavorable conditions?

Endospores
Fruiting bodies
Conidia
Pili
2

Under unfavorable conditions, slime moulds form fruiting bodies that produce resistant spores to survive harsh environments.

Which of the following is true regarding viruses?

They are always made of DNA
They cannot reproduce outside a host
They have a cell membrane
They are considered living organisms
2

Viruses require a host cell for replication and are considered non-living outside of a host.

Which of the following is a characteristic of viral capsids?

They are made of lipids
They protect the viral genetic material
They perform photosynthesis
They contain ribosomes
2

Viral capsids are protein structures that protect the viral genetic material (DNA or RNA) and aid in host cell attachment.

Which of the following best describes a viroid?

A protein-only infectious agent
A bacterium that causes plant diseases
An infectious RNA molecule without a protein coat
A virus that infects bacteria
3

Viroids are infectious RNA molecules that lack a protein coat and cause plant diseases.

Which of the following statements about diatoms is incorrect?

Diatoms have silica-embedded cell walls.
Diatoms are exclusively heterotrophic.
Diatoms are a major component of phytoplankton.
Diatoms contribute significantly to oxygen production.
2

Diatoms are autotrophic and perform photosynthesis, contributing significantly to marine oxygen production.

Which of the following is an example of a disease caused by a protozoan?

Ringworm
Tuberculosis
Malaria
Tetanus
3

Malaria is caused by Plasmodium, a protozoan parasite transmitted by Anopheles mosquitoes.

Which of the following statements about lichens is correct?

Lichens are a symbiotic association of fungi and algae.
Lichens grow well in highly polluted areas.
Lichens do not contribute to soil formation.
Fungi in lichens perform photosynthesis.
1

Lichens are formed by a symbiotic association between fungi and algae, where algae perform photosynthesis.

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