Biological Classification Chapter-Wise Test 20

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following was one of the main criteria used by R. H. Whittaker for the five-kingdom classification?

Colour of the organism
Mode of nutrition
Geographical distribution alone
Economic importance
2

Whittaker used cell structure, body organisation, mode of nutrition, reproduction and phylogenetic relationships as the principal criteria for his five-kingdom classification.

How is a zygospore formed in Phycomycetes?

By the fusion of two gametes
By budding from a parent cell
By fragmentation of the mycelium
By germination of a conidium
1

In Phycomycetes, sexual reproduction results in the formation of a zygospore by the fusion of two gametes. The gametes may be similar in morphology or may differ from each other.

Which feature is found in some marine amoeboid protozoans?

Stiff cellulose plates
A protein-rich pellicle
A chitinous cell wall
Silica shells on their surface
4

Amoeboid protozoans move and capture prey by forming pseudopodia. Some marine amoeboid forms also possess silica shells on their surface.

Which statement correctly describes Albugo?

It is a ciliated protozoan found in fresh water.
It is a parasitic member of Phycomycetes found on mustard.
It is a basidiomycete that causes wheat rust.
It is a cyanobacterium that fixes nitrogen.
2

Albugo is a member of Phycomycetes and occurs as a parasitic fungus on mustard. Other examples of this fungal class include Mucor and Rhizopus.

What is the network of fungal hyphae called?

Plasmodium
Ascocarp
Pellicle
Mycelium
4

The fungal body generally consists of long, slender, thread-like structures called hyphae. The network formed by these hyphae is known as the mycelium.

How do euglenoids behave when deprived of sunlight?

They behave as heterotrophs and prey on smaller organisms.
They become inactive spores.
They fix atmospheric nitrogen.
They form fruiting bodies.
1

Euglenoids are photosynthetic in the presence of sunlight. When sunlight is unavailable, they behave as heterotrophs by preying on smaller organisms.

How are the two flagella arranged in most dinoflagellates?

Both lie longitudinally.
Both lie transversely.
One is longitudinal and the other is transverse.
Both are confined within the nucleus.
3

Most dinoflagellates possess two flagella. One lies longitudinally, while the other lies transversely in a furrow between the stiff cellulose plates of the cell wall.

Which edible fungi are described as delicacies among Ascomycetes?

Morels and truffles
Rusts and smuts
Mucor and Albugo
Alternaria and Trichoderma
1

Morels and truffles are edible members of Ascomycetes and are regarded as delicacies. Ascomycetes are commonly called sac fungi.

Which of the following diseases is caused by bacteria?

Malaria
Sleeping sickness
Citrus canker
Wheat rust
3

Citrus canker is listed as a bacterial disease. Malaria is caused by Plasmodium, sleeping sickness is associated with parasitic flagellated protozoans, and wheat rust is caused by Puccinia, a fungus.

What important ecological role is performed by many Deuteromycetes?

They act as primary producers in oceans.
They decompose litter and help in mineral cycling.
They cause red tides.
They form heterocysts for nitrogen fixation.
2

A large number of Deuteromycetes are decomposers of litter. By breaking down this material, they help return mineral nutrients to the environment and therefore contribute to mineral cycling.

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