List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. 

Given below is a list of six micro-organism. State their usefulness to humans.
(a) Nucleopolyhedrovirus
(b) Saccharomyces cervisiae
(c) Monascus purpureus
(d) Trichoderma polysporum
(e) Peniciliu notatum.
(f) Propionibacterium sharmanni

Name the genus to which baculoviruses belong. Describe, their role in the integrated pest management programmes.

SCP

Name the microbes that help production of the following products commercially : (a) Statin (b) Citric acid (c) Penicillin (d) Butyric acid

Your advice is sought to improve the nitrogen content of the soil to use for cultivation of a non-leguminous terrestrial crop.

(a) Recommend two microbes that can enrich the soil with nitrogen.

(b) Why do leguminous crops not require such enrichment of the soil?

Organic farmers prefer the biological control of diseases and pests of the use of chemicals for the same purpose. Justify.

Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents.

A good producer of citric acid is

• Aspergillus

• Pseudomonas

• Clostridium

• Clostridium

120.

Match the following list of microbes and their importance:

(a)	Sacharomyces cerevisiae	(i)	Production of immunosuppressive agents
(b)	Monascus purpureus	(ii)	Riperuing of Swiss cheese
(c)	Trichoderma polysporum	(iii)	Commercial production of ethanol
(d)	Propionibacterium sharmanii	(iv)	Production of blood cholesterol lowering agents

• Codes
   A   B   C    D
  3    4    1    2

• A   B   C   D
  4   3    2   1

• A   B   C   D
  4   2    1   3

• A   B   C   D
  4   2    1   3