MCQ on Plant Sciences

 

1. Which of the following soil microorganism is involved in the reduction of sulfates to sulfides?
   A. Thiobacillus thiooxidans
   B. Desulfovibrio
   C. Rhodospirillum
   D. Rhodomicrobium

2. The species of Acetobacter which produces cellulosic microfibrils to hold the cells in slimy mass is
   A. Acetobacter curvum
   B. Acetobacter orleanense
   C. Acetobacter xylinum
   D. Acetobacter schutzenbachii

3. Which of the following fungi on infecting crop roots can improve their intake of phosphorus and other nutrients?
   A. Saccharomyces cerevisiae
   B. VA Mycorrhiza
   C. Candida torulopsis
   D. Aspergillus

4. The crushed grapes used for wine manufacturing are also known as
   A. Wort
   B. Must
   C. Hop
   D. Pilsener

5. The microorganisms that grow best in a low-oxygen environment is called a (n)
   A. Aerobe
   B. Anaerobe
   C. Facultative
   D. Microaerophile

6. Botulism is caused by the presence of toxin produced by
   A. Clostridium tyrobutyricum
   B. Clostridium sporogenes
   C. Clostridium botulinum
   D. None of these

7. Which of the following has more tolerance for acidic pH?
   A. Yeast and moulds
   B. Bacteria
   C. E. coli
   D. None of these

8. An organism used in the microbial production of citric acid
   A. Penicillium notatum
   B. Rhizopus nigricans
   C. Aspergillus niger
   D. Lactobacillus delbrueckii

9. Organisms using organic compounds as electron donors are called
   A. Lithotrophs
   B. Phototrophs
   C. Chemotrophs
   D. Organotrophs

10. The concept of using microbes to clean up the environment is called
    A. Pasteurization
    B. Bioremediation
    C. Fermentation
    D. Biolistics

11. Which of the following is used to grow bacterial cultures continuously?
    A. Chemostat
    B. Coulter Counter
    C. Hemostat
    D. Petroff-Hausser chamber

12. If a canning procedure is not properly followed, the following type of microbe is most likely to grow in the canned food
    A. Obligate aerobe
    B. Acidophile
    C. Mesophile
    D. Obligate anaerobe

13. Which of the following is commonly used as Gram’s decolouriser?
    A. Ethyl alcohol
    B. Methyl alcohol
    C. Acetone
    D. A mixture of ethyl alcohol and acetone

14. The biological process of purification of wastewater
    A. Secondary treatment
    B. Primary treatment
    C. Tertiary treatment
    D. None of the above

15. Agar, which is the solidifying agent in many bacterial culture media, is part of the cell wall of
    A. Chlorophyta
    B. Chrysophyta
    C. Pyrrhophyta
    D. Rhodophyta