Biological Classification
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Why were Chlamydomonas and Chlorella placed in Kingdom Protista under the five-kingdom classification?

They are single-celled eukaryotes.
They are multicellular fungi.
They are prokaryotic organisms.
They lack cell walls.
1

The five-kingdom system places single-celled eukaryotic organisms in Kingdom Protista. Thus, Chlamydomonas and Chlorella, although previously grouped with plants and possessing cell walls, are included in Protista.

What is the most common ecological role of heterotrophic bacteria?

They act as important decomposers.
They form basidiocarps.
They produce red tides.
They are the chief producers in oceans.
1

Heterotrophic bacteria are the most abundant bacteria in nature, and the majority function as important decomposers. They obtain food from other organisms or from dead organic matter.

Which set contains only groups included under Kingdom Protista in the chapter?

Chrysophytes, dinoflagellates, euglenoids, slime moulds and protozoans
Bryophytes, pteridophytes, gymnosperms and angiosperms
Phycomycetes, Ascomycetes, Basidiomycetes and Deuteromycetes
Archaebacteria, eubacteria, fungi and animals
1

Kingdom Protista includes chrysophytes, dinoflagellates, euglenoids, slime moulds and protozoans. These organisms are single-celled eukaryotes and are primarily aquatic.

How do chrysophytes generally remain suspended in water?

They float passively in water currents as plankton.
They crawl using pseudopodia.
They attach permanently to rocks.
They move using thousands of cilia.
1

Chrysophytes are microscopic organisms found in freshwater and marine environments. They float passively in water currents and form part of the plankton.

Where may amoeboid protozoans occur?

Fresh water, sea water or moist soil
Only in hot springs
Only inside plant roots
Only in highly saline water
1

Amoeboid protozoans may live in fresh water, sea water or moist soil. They move and capture prey by extending pseudopodia, or false feet.

Which unicellular fungus is used in making bread and beer?

Yeast
Puccinia
Albugo
Ustilago
1

Yeast is a unicellular fungus used in the preparation of bread and beer. Most other fungi are filamentous and possess bodies made of hyphae.

Which association represents mycorrhiza?

Fungi associated with the roots of higher plants
Algae associated with fungi in lichens
Methanogens living in the gut of ruminants
Cyanobacteria living in polluted water
1

Mycorrhiza is a symbiotic association between fungi and the roots of higher plants. Fungi may also live symbiotically with algae, forming lichens.

Which statement correctly describes the growth pattern of animals?

They follow a definite growth pattern and attain a definite adult shape and size.
They continue growing indefinitely without attaining a definite form.
Their growth occurs only through spore formation.
They lack sensory and neuromotor mechanisms.
1

Animals follow a definite growth pattern and develop into adults with a definite shape and size. Higher animals also possess elaborate sensory and neuromotor mechanisms.

What observation led Dmitri Ivanowsky to recognise the causal agent of tobacco mosaic disease as being smaller than bacteria?

It passed through bacteria-proof filters.
It could form heterocysts.
It produced basidiospores.
It possessed a cellulose cell wall.
1

Dmitri Ivanowsky observed that the agent causing tobacco mosaic disease passed through bacteria-proof filters. This indicated that the infectious agent was smaller than bacteria.

Which disease was caused by the viroid discovered by T. O. Diener?

Potato spindle tuber disease
Tobacco mosaic disease
Wheat rust
Citrus canker
1

T. O. Diener discovered the viroid in 1971 while studying potato spindle tuber disease. The infectious agent was smaller than viruses and consisted of low-molecular-weight RNA without a protein coat.

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