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12th Biology Monthly Test - 2 ( Zoology - Microbes in Human Welfare )

St. Britto Hr. Sec. School - Madurai

12th Biology Monthly Test - 2 ( Zoology - Microbes in Human Welfare )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The gases produced in anaerobic sludge digesters are

Methane, oxygen and hydrogen sulphide
Hydrogen sulphide, methane and sulphur dioxide
Hydrogen sulphide, nitrogen and methane
Methane, hydrogen sulphide and CO₂.

The purpose of biological treatment of waste water is to _______

Reduce BOD
Increase BOD
Reduce sedimentation
Increase sedimentation

Which of the following bacteria is used extensively as a bio-pesticide?

Bacillus thurigiensis
Bacillus subtilis
Lactobacillus acidophilus
Streptococcus lactis

A free living fungi which is a biocontrol agent _______ .

Phytophthora palmivora
Trichoderma
Polyporus
Peziza

Lactobacillus helps to produce _____________.

Citric acid
Milk
Acetic acid
Butyric acid

_________________ is not used as a biofertilizer.

Bacillus thuringiensis
Rhizobium
Nostoc
Anabaena

The cry toxin affects ___________ system of insect pests.

Nervous system
Respiratory system
Digestive system
Reproductive system

Identify the free liviiig nitrogen fixing bacteria _____________.

Azotobacter
Rhizobium
Glomus
Ideonella sakaiensis

Which of the following microorganism is used for production of citric acid in industries?

Lactobacillus bulgaris
Penicillium citrinum
Aspergillus niger
Rhizopus nigricans

____________ is not a biocontrol agent.

Trichoderma
Dragonfly
Glomus
Buculovirus

Genetically engineered______________ are used as dot buster in cardiac related issues.

Staphylococcus
Yeast
Penicillium
Streptococci

Cyclosporin – A is an immunosuppressive drug produced from _______

Aspergillus niger
Manascus purpureus
Penicillium notatum
Trichoderma polysporum

Mycorrhiza cannot contribute to this process.

Resistance to pathogens
Tolerance to salinity
Help to fix nitrogen
Enhance plant growth

World Biofuel day is observed on ___________.

l0^th September
22^nd April
l0^th August
l7^th October

The first bio herbicide was got from ______________.

Trichoderma
Phytophthora species
Bacillus
Aspergillus

Part - B

Generic 2 - Answer All Question

What are mycorrhiza?

Give two examples of acids produced from microbes.

Why were Chain and Florey awarded Nobel Prize?

What is superbug?
How are antibiotics classified?

Oxygen inhibits the fermentation process. Why?

What are crygenes?

Define bioremediation.

Part - C

Generic 3 - Answer All Question

How is yoghurt produced?

What is the significance ofNucleopolyhedrovirus?
What is the importance of streptomycin.

Explain the secondary treatment of waste water.

Explain the secondary treatment of waste water.

What is a fermenter or bioreactor?

What is Cyclosporin A?

Mention a therapeutic use of Yeast.

Part - D

Generic 5 - Answer All Question

Explain the working of a biogas plant.

List the advantages of biogas plants in rural areas.

Explain the process of sewage treatment.

What is the key difference between primary and secondary sewage treatment?
When does antibiotic resistance develop?

Write short notes on the following.
a) Brewer's yeast
b) Ideonella sakaiensis
c) Microbial fuel cells

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