This set of Dairy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Molds”.
1. Kingdom protista includes organisms like __________
a) Euglena, Spirogyra and Penicillium
b) Amoeba, Spirogyra and Penicillium
c) Amoeba, Euglena and Penicillium
d) Amoeba, Euglena and Diatoms
View Answer
Explanation: A protista is a group which includes eukaryotic organism that is not an animal, plant or fungus. Protista kingdom includes Amoeba, Euglena and Diatoms.
2. Bioluminescence is exhibited by __________
a) Chlorella
b) Chlamydomonas
c) Hirudinaria
d) Ceratium
View Answer
Explanation: Bioluminescence is the phenomenon of production and emission of light by a living organism. Ceratium exhibits Bioluminescence.
3. Protista differs from monera in having __________
a) Cell wall
b) Nuclear membrane
c) Flagella
d) Autotropic nutrition
View Answer
Explanation: Monera is a kingdom which contained unicellular organisms with a prokaryotic cell organization example Bacteria. Protista has a Nuclear membrane as opposed to monera which lacks it.
4. Single celled eukaryotes are included in __________
a) Fungi
b) Archae
c) Monera
d) Protista
View Answer
Explanation: The single celled eukaryotes are classified under the kingdom “PROTISTA”. It is being a paraphyletic group. They are first eukaryotes, having a well organized nucleus and complex membranous organelles.
5. The slime moulds are characterized by the presence of __________
a) Elaters
b) Pseudoelaters
c) Capillitium
d) Sourness
View Answer
Explanation: Slime molds have pseudo elaters. The result is one large bag of cytoplasm with many diploid nuclei.
6. Which of the following is not a character of protista?
a) Protista are prokaryotic
b) Body organization is cellular
c) Some protists have cell walls
d) Membrane bound organelles are present in cells
View Answer
Explanation: All single celled organisms are placed under the Kingdom Protista. Protista are thus prokaryotic.
7. Red tide is caused by __________
a) Noctiluca
b) Gonyaulax
c) Gymnodinium
d) Noctiluca, Gonyaulax and Gymnodinium
View Answer
Explanation: Red tide is caused by algal blooms during which algae become so numerous that they discolor coastal waters. It is caused by Noctiluca, Gonyaulax and Gymnodinium.
8. Which of the following combination of characters is true for slime moulds?
a) Parasitic, Plasmodium with true walls, spores dispersed by air currents
b) Saprophytic, Plasmodium without walls, spores dispersed by water
c) Parasitic, Plasmodium without walls, spores dispersed by water
d) Saprophytic, Plasmodium without walls, spores dispersed by air currents
View Answer
Explanation: Slime mold is a soil-dwelling amoeba. It is a brainless, single-celled organism, often containing multiple nuclei. Out of the above options “Saprophytic, Plasmodium without walls, spores dispersed by air currents” is correct.
9. Kingdom protista includes __________
a) Life cycle showing sporic meiosis
b) Life cycle showing gametic meiosis
c) Life cycle showing zygotic meiosis
d) Life cycle showing zygotic meiosis and gametic meiosis
View Answer
Explanation: Zygotic Meiosis is the process in which the organism spends most of its life cycle in haploid condition. In gametic meiosis the organism spends most of its life cycle in the 2n condition. Kingdom protista shows both zygotic meiosis and gametic meiosis.
10. In diatoms, auxospores help in __________
a) Metabolism
b) Spore formation
c) Reproduction
d) Growth
View Answer
Explanation: Auxospores play a role in sexual reproduction or dormancy. They have no effect on metabolism.
11. The chief type of spoilage in sweetened condensed milk may not be __________
a) Gas formation by sucrose fermenting yeast
b) Thickening caused by micrococci
c) Molds colonies growing on surface
d) Cleaning in Place
View Answer
Explanation: Gas formation by sucrose fermenting yeast is a kind of spoilage indicator in sweetened condensed milk. Thickening caused by micrococci and molds colonies growing on a surface are also spoilage indicator in sweetened condensed milk.
12. Blue Cheese mold is __________
a) Penicillium roqueforti
b) Stachybotrys chartarum
c) Aspergillus niger
d) Penicillium camemberti
View Answer
Explanation: The genus Penicillium is one of the most common types of mould. The Blue-cheese mold is called Penicillium roqueforti.
13. Camembert mold is __________
a) Penicillium roqueforti
b) Stachybotrys chartarum
c) Aspergillus niger
d) Penicillium camemberti
View Answer
Explanation: Penicillium due to their powerful protein and fat splitting properties make them the chief agents in the ripening of Blue cheese, Camembert, etc. the Camembert mold is Penicillium camemberti.
14. Milk mold is also called __________
a) Penicillium roqueforti
b) Stachybotrys chartarum
c) Geotrichum candidum
d) Penicillium camemberti
View Answer
Explanation: The milk mould Geotrichum candidum is on the borderline between yeast and mould. The mold occurs on the surface of cultured milk as a fine, white velvety coating.
15. Which of the following is due to molds?
a) Discoloration
b) Off-flavor
c) Discoloration and off-flavor
d) Freshness
View Answer
Explanation: Molds on the surfaces of cheese and butter can cause discoloration and also give the product an off-flavor. Strict hygiene is necessary in the dairy in order to prevent products from being affected by moulds during processing.
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