Biological Classification
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Why were bacteria and blue-green algae placed together with other plants in earlier classification systems?

All of them were multicellular.
All of them had a membrane-bound nucleus.
All of them were non-photosynthetic.
All of them possessed a cell wall.
4

Earlier classifications placed bacteria, blue-green algae and several eukaryotic groups together under plants because all of them possessed cell walls. This approach ignored major differences in cell type, body organisation and mode of nutrition.

Sexual reproduction in protists involves which of the following?

Cell fusion and zygote formation
Formation of basidia
Production of heterocysts
Binary fission only
1

Protists reproduce both asexually and sexually. Their sexual reproduction involves cell fusion followed by the formation of a zygote.

Which is a stated use of diatomaceous earth?

Production of methane from dung
Formation of antibiotics
Polishing and filtration of oils and syrups
Fixation of atmospheric nitrogen
3

Diatomaceous earth is formed by the accumulated silica-rich cell-wall deposits of diatoms. Because it is gritty, it is used for polishing and for filtering oils and syrups.

What determines whether a dinoflagellate appears yellow, green, brown, blue or red?

The number of nuclei in the cell
The main pigments present in its cells
The thickness of its silica shell
The absence of flagella
2

Dinoflagellates may appear yellow, green, brown, blue or red depending on the principal pigments present in their cells. Most members are marine and photosynthetic.

Which statement correctly describes the flagella of euglenoids?

They possess thousands of cilia instead of flagella.
They completely lack locomotory structures.
They have one transverse flagellum only.
They have two flagella, one short and one long.
4

Euglenoids possess two flagella of unequal length—one short and one long. They also have a flexible, protein-rich pellicle instead of a cell wall.

Which features form the basis for dividing Kingdom Fungi into different classes?

Only habitat and colour
Mycelial morphology, mode of spore formation and fruiting bodies
Only the presence of chlorophyll
Only the type of nutrition
2

The major fungal classes are distinguished using the morphology of the mycelium, the mode of spore formation and the nature of their fruiting bodies.

In Ascomycetes, asci are arranged in fruiting bodies called:

Basidiocarps
Sporangia
Ascocarps
Plasmodia
3

Ascospores are produced endogenously inside sac-like asci. These asci are organised into fruiting bodies called ascocarps.

Which set contains only examples of Deuteromycetes?

Alternaria, Colletotrichum and Trichoderma
Mucor, Rhizopus and Albugo
Agaricus, Ustilago and Puccinia
Aspergillus, Claviceps and Neurospora
1

Alternaria, Colletotrichum and Trichoderma are examples of Deuteromycetes. Members of this group reproduce by asexual spores called conidia.

Who named the infectious tobacco extract “Contagium vivum fluidum”?

W. M. Stanley
M. W. Beijerinck
T. O. Diener
R. H. Whittaker
2

M. W. Beijerinck showed that extract from infected tobacco plants could infect healthy plants. He called the infectious fluid “Contagium vivum fluidum,” meaning infectious living fluid.

How are the capsomeres of a viral capsid arranged?

Only in a linear chain
Inside a membrane-bound nucleus
In helical or polyhedral geometric forms
As cellulose plates on the outer surface
3

The viral protein coat is called the capsid and is made of smaller subunits called capsomeres. These capsomeres are arranged in helical or polyhedral geometric forms around the nucleic acid.

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