Biological Classification Chapter-Wise Test 19

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following best describes the function of heterocysts in cyanobacteria?

Photosynthesis
Nitrogen fixation
Reproduction
Movement
2

Heterocysts in cyanobacteria like Nostoc and Anabaena are specialized cells for nitrogen fixation.

Which component in the bacterial cell wall makes it unique from eukaryotic cells?

Cellulose
Chitin
Peptidoglycan
Lignin
3

The bacterial cell wall is composed of peptidoglycan, which provides structural integrity and protection.

What is the mode of nutrition in Kingdom Animalia?

Autotrophic
Holozoic
Saprophytic
Parasitic
2

Kingdom Animalia members exhibit holozoic nutrition, which involves ingestion and internal digestion.

Which of the following statements about fungi is correct?

Fungi have cell walls composed of chitin.
Fungi perform photosynthesis.
Fungi store carbohydrates as starch.
Fungi reproduce only through sexual reproduction.
1

Fungal cell walls are made of chitin, unlike plant cell walls, which are composed of cellulose.

What is the primary function of bacterial pili?

Protection against phagocytosis
Facilitate genetic exchange during conjugation
Enable photosynthesis
Form resistant spores
2

Bacterial pili are hair-like structures that facilitate genetic exchange during conjugation or attachment to surfaces, unlike capsules, which protect against phagocytosis.

Which of the following is a characteristic of viral replication?

Viruses replicate independently of a host
Viruses use host machinery for replication
Viruses replicate via binary fission
Viruses produce their own ribosomes
2

Viruses are obligate intracellular parasites that rely on host cell machinery for replication, unlike bacteria, which can use binary fission.

Which group of organisms reproduces through binary fission under favorable conditions?

Bacteria
Fungi
Protozoa
Algae
1

Bacteria primarily reproduce by binary fission, a rapid asexual mode of reproduction.

Which group of fungi includes pathogenic species that cause rust and smut diseases in plants?

Ascomycetes
Basidiomycetes
Deuteromycetes
Phycomycetes
2

Basidiomycetes include plant pathogens like Puccinia (rust) and Ustilago (smut).

Which of the following fungal reproductive structures is involved in asexual reproduction?

Basidiospores
Ascospores
Conidia
Zygospores
3

Conidia are asexual spores produced exogenously in fungi like Penicillium.

Which of the following statements about prions is incorrect?

Prions are infectious proteins.
Prions contain both DNA and RNA.
Prions cause neurodegenerative diseases.
Prions lack a cellular structure.
2

Prions are infectious proteins that lack any nucleic acid (DNA or RNA).

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