Biological Classification
Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which pair consists of partially heterotrophic plants mentioned in the chapter?

Cuscuta and Rhizopus
Bladderwort and Venus flytrap
Nostoc and Anabaena
Amoeba and Paramoecium
2

Bladderwort and Venus flytrap are insectivorous plants and are therefore partially heterotrophic. Cuscuta is also partially heterotrophic, but it is specifically described as a parasite.

On what basis did Aristotle divide animals into two groups?

Presence or absence of red blood
Mode of nutrition
Presence or absence of a cell wall
Type of genetic material
1

Aristotle used simple morphological characters for classification. He divided animals into those that had red blood and those that did not.

Why was the traditional two-kingdom classification considered inadequate?

It included no plants.
It classified organisms only by habitat.
It did not distinguish prokaryotes from eukaryotes.
It separated fungi from green plants.
3

The two-kingdom system did not distinguish prokaryotes from eukaryotes, unicellular from multicellular organisms, or photosynthetic organisms from non-photosynthetic fungi. Many organisms therefore did not fit properly into either Plantae or Animalia.

Which statement correctly describes the proposed three-domain system mentioned in the chapter?

It divides Monera into two domains and places the eukaryotic kingdoms in a third domain.
It combines all five kingdoms into one domain.
It divides Plantae into three domains.
It places viruses in a separate cellular domain.
1

The three-domain system divides Kingdom Monera into two domains. The remaining eukaryotic kingdoms are placed in the third domain, producing a six-kingdom classification.

Which statement best describes the distribution of bacteria?

They occur only in freshwater habitats.
They are restricted to the bodies of animals.
They cannot survive in deserts or snow.
They occur almost everywhere, including extreme habitats.
4

Bacteria are extremely abundant and occur almost everywhere. They are found in soil and also in extreme habitats such as hot springs, deserts, snow and deep oceans.

Which bacterial disease is correctly matched with its cause?

Malaria—bacteria
Typhoid—bacteria
Wheat rust—bacteria
Sleeping sickness—bacteria
2

Typhoid is listed as a bacterial disease. Other bacterial diseases mentioned include cholera, tetanus and citrus canker.

Kingdom Protista forms a link with which other kingdoms?

Only Monera and Plantae
Only Animalia
Plants, animals and fungi
Viruses and viroids
3

Kingdom Protista forms a link with the kingdoms dealing with plants, animals and fungi. Its members are single-celled eukaryotes and are primarily aquatic.

How do the pigments of euglenoids compare with those of higher plants?

They are completely absent.
They are found only in heterotrophic forms.
They are made of silica.
They are identical to those of higher plants.
4

The photosynthetic pigments of euglenoids are identical to those present in higher plants. This allows euglenoids to photosynthesise when sunlight is available.

Under suitable conditions, what structure is formed by slime moulds?

A plasmodium that may spread over several feet
A basidiocarp bearing basidia
A pellicle with two flagella
A heterocyst-containing filament
1

Under suitable conditions, slime moulds form an aggregation called a plasmodium. This structure may grow and spread over an area of several feet.

Why is food commonly kept in a refrigerator?

To promote the growth of fungi
To increase the rate of bacterial fission
To reduce spoilage caused by bacterial and fungal infections
To stimulate spore germination
3

Fungi generally prefer warm and humid conditions. Refrigeration helps prevent food from going bad by slowing the bacterial and fungal growth responsible for spoilage.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0