Biological Classification Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

An aquatic microscopic organism has two overlapping silica-containing wall layers. Its indestructible wall deposits accumulate over long periods. Which use of the resulting material is correctly identified?

Production of methane from dung
Polishing and filtration of oils and syrups
Fixation of atmospheric nitrogen
Formation of antibiotics
2

The organism is a diatom. Its silica-containing wall deposits accumulate to form diatomaceous earth, which is gritty and is used for polishing and for filtering oils and syrups.

A fungus has branched, septate mycelium, generally lacks asexual spores and produces sexual spores externally on a specialised structure. Which combination is correct?

Ascomycetes—ascospores inside asci
Phycomycetes—zoospores inside sporangia
Deuteromycetes—zygospores inside asci
Basidiomycetes—basidiospores on basidia
4

The fungus belongs to Basidiomycetes. Karyogamy and meiosis occur in a basidium, and basidiospores are produced externally on it. Asexual spores are generally absent in this group.

A fungus grows on decaying wood in a moist place, has aseptate coenocytic mycelium and produces spores inside sporangia. Which organism could be an example?

Puccinia
Neurospora
Mucor
Alternaria
3

The features identify Phycomycetes. Members of this class may occur on decaying wood in moist places, possess aseptate coenocytic mycelium and produce zoospores or aplanospores inside sporangia. Mucor is an example.

An infectious agent associated with potato spindle tuber disease is smaller than viruses and lacks a protein coat. What is its chemical nature?

Abnormally folded protein
Free RNA of low molecular weight
Double-stranded DNA enclosed by capsomeres
Both RNA and DNA inside a protein coat
2

The agent is a viroid. Viroids consist of free RNA of low molecular weight and lack the protein coat found in viruses. T. O. Diener discovered them while studying potato spindle tuber disease.

A branched, septate fungus produces conidia externally and belongs to the class commonly called sac fungi. Which useful organism could fit this description?

Ustilago, a methane-producing bacterium
Albugo, a ciliated protozoan
Penicillium, a source of antibiotics
Gonyaulax, a saprophytic fungus
3

Penicillium is an Ascomycete, or sac fungus, and is a source of antibiotics. Ascomycetes possess branched, septate mycelium and commonly produce conidia externally on conidiophores.

An organism absorbs soluble organic matter from dead material, has a wall containing chitin and stores reserve food as glycogen and oil droplets. In which kingdom should it be placed?

Plantae
Animalia
Fungi
Protista
3

The organism belongs to Kingdom Fungi. Fungi are absorptive heterotrophs, their walls contain chitin and other polysaccharides, and their reserve food is stored as glycogen and oil droplets.

A heterotrophic bacterium is useful in food production, while many related bacteria decompose dead organic matter. Which pair of roles is described?

Conversion of milk into curd and decomposition
Formation of red tides and production of basidiospores
Formation of diatomaceous earth and photosynthesis
Production of ascocarps and nitrogen fixation in heterocysts
1

Some heterotrophic bacteria help convert milk into curd. Most heterotrophic bacteria act as important decomposers and obtain nutrients from dead organic matter.

A photosynthetic prokaryote contains chlorophyll a, may form blooms in polluted water and sometimes possesses specialised nitrogen-fixing cells. Which group is described?

Dinoflagellates
Euglenoids
Diatoms
Cyanobacteria
4

Cyanobacteria are photosynthetic prokaryotes containing chlorophyll a. Their colonies may form blooms in polluted water, and some members fix atmospheric nitrogen in heterocysts.

A fungus is initially classified among imperfect fungi because only its vegetative mycelium and conidia are known. Its sexual stage is later found to produce ascospores. What should happen?

It should remain permanently in Deuteromycetes.
It should be transferred to Ascomycetes.
It should be transferred to Phycomycetes.
It should be placed in Kingdom Protista.
2

Deuteromycetes contain fungi whose sexual stages are unknown. When the sexual stage is discovered, the fungus is transferred to the appropriate class. The production of ascospores identifies it as an Ascomycete.

An organism is multicellular, lacks a cell wall, ingests food and digests it internally. Which reserve materials are expected?

Glycogen and fat
Starch and cellulose
Chitin and oil droplets
Silica and glycogen
1

The organism belongs to Kingdom Animalia. Animals are multicellular heterotrophs without cell walls, ingest and internally digest food, and store reserve food as glycogen or fat.

Performance Summary

Score:

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