Biological Classification Chapter-Wise Test 16

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following correctly matches the components of a lichen?

Phycobiont—fungal and heterotrophic; mycobiont—algal and autotrophic
Phycobiont—algal and autotrophic; mycobiont—fungal and heterotrophic
Both components are fungal and heterotrophic
Both components are algal and autotrophic
2

In lichens, the phycobiont is the autotrophic algal component, while the mycobiont is the heterotrophic fungal component.

Which of the following organisms completely lacks a cell wall?

Nostoc
Anabaena
Mycoplasma
Bacillus
3

A cell wall is completely absent in Mycoplasma, which includes the smallest living cells known.

Which of the following statements about viroids is true?

They have a protein coat
They contain DNA as genetic material
They lack a protein coat and consist only of RNA
They infect only animals
3

Viroids are infectious agents made of low-molecular-weight RNA. They lack the protein coat found in viruses and were discovered by T. O. Diener.

Which of the following groups has cell walls composed of chitin and polysaccharides?

Plants
Fungi
Bacteria
Protozoans
2

Fungal cell walls are composed of chitin and polysaccharides.

Which of the following is a characteristic of archaebacteria?

Presence of peptidoglycan in their cell walls
Exclusively photosynthetic nutrition
Obligate intracellular parasitism
Ability to live in harsh habitats
4

Archaebacteria occur in harsh habitats such as extremely salty areas, hot springs and marshy areas. Their different cell wall structure supports survival under these conditions.

Which of the following is an example of a parasitic protozoan?

Plasmodium
Euglena
Paramoecium
Amoeba
1

Plasmodium is a parasitic sporozoan with an infectious spore-like stage in its life cycle and causes malaria.

Which of the following is a characteristic of chrysophytes?

Their cell walls are chitinous
They are obligate parasites
They lack chloroplasts
Most of them are photosynthetic
4

Chrysophytes include diatoms and golden algae (desmids). Most are photosynthetic, microscopic and occur as plankton in fresh water and marine environments.

During unfavourable conditions, what does the plasmodium of slime moulds form?

A zygote
Fruiting bodies bearing spores
A protein-rich pellicle
Heterocysts
2

During unfavourable conditions, the plasmodium forms fruiting bodies that bear resistant, air-dispersed spores at their tips.

What is the mode of nutrition in slime moulds?

Photosynthetic
Holozoic
Saprophytic
Parasitic
3

Slime moulds are saprophytic protists that move over decaying twigs and leaves and engulf organic material.

Which fungal class is called "imperfect fungi" because only its asexual or vegetative phases are known?

Phycomycetes
Ascomycetes
Basidiomycetes
Deuteromycetes
4

Deuteromycetes are called imperfect fungi because only their asexual or vegetative phases are known. They reproduce by asexual spores called conidia.

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