1. Bacteria which cause diseases in humans, animals and plants are called __________
a) Anaerobic bacteria
b) Aerobic bacteria
c) Pathogenic bacteria
d) Non pathogenic bacteria
Discussion
Explanation: Organisms which produce diseases are called pathogenic bacteria. These organisms bring about disease in human beings, animals and plants by attacking and breaking down living cells and producing poisonous substances
2. What is pigment or color production by bacteria called?
a) Cytogenesis
b) Phytogenesis
c) Chromogenesis
d) Chemogenesis
Discussion
Explanation: The process of color production is called chromogenesis. The organism causing the production is referred to as chromogenic.
3. Which of the following species of Clostridium is responsible for the formation of dark green to black colors in cheese?
a) Clostridium tyrobutyricum
b) Clostridium sporogenes
c) Clostridium herbarum
d) None of the mentioned
Discussion
Explanation: Clostridium herbarum gives the dark green to black color in cheese. It is one of the species of clostridium.
4. Fungi can be divided as __________
a) Yeast
b) Mold
c) Yeast and mold
d) Bacteria
Discussion
Explanation: Fungi are a group of micro-organisms which are frequently found in nature among plants, animals and human beings. They can be divided into two categories namely yeast and mold.
5. Which one of the following is called the ‘brewer’s yeast’?
a) Saccharomyces ludwigi
b) Saccharomyces cerevisiae
c) Saccharomyces boulardii
d) Saccharomyces pastorianus
Discussion
Explanation: Saccharomyces cerevisiae is also known as brewer’s yeast. It helps in the fermentation of beer
6. Which of the following is the source of Vitamin A?
a) Sterptococcus
b) Rhodotorula gracilis
c) Bacteria
d) Yeast
Discussion
Explanation: Rhodotorula gracilis is yeast. It is rich in vitamin A
7. Yeast cells are good source of __________
a) Vitamin A and B
b) Vitamin A and D
c) Vitamin B and D
d) Vitamin K
Discussion
Explanation: Yeasts are considered to be a very good source of Vitamin B and Vitamin D.
8. Roquefort cheese is ripened by __________
a) Penicillium roqueforti
b) Penicillium camemberti
c) Penicillium sp
d) Penicillium rhizogenes
Discussion
Explanation: Penicillium roqueforti helps in the ripening of Roquefort cheese. Penicillium is a mold
9.Penicillium camemberti is used for ripening of __________
a) roqueforti cheese
b) camembert cheese
c) all cheese
d) fruits
Discussion
Explanation: Camembert cheese is a soft cheese. It is ripened by Penicillium camemberti.
10. Which of the following is a heteroceous fungus?
a) Albugo
b) Phytophora
c) Puccinia
d) Ustilago
Discussion
Explanation: Puccinia is a heteroceous fungus in the above group of funguses