This practice test includes 25 important multiple-choice questions (MCQs) with answers and explanations from the Class 12th Biology Chapter – Microbes In Human Welfare. These questions are very helpful for NEET and other competitive entrance exams after the 12th.
Microbes in Human Welfare : Class – 12th (Biology) Practice Test | MCQs for NEET
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Total: 25 Questions
Questions
Q1.
Integrated Pest Management (IPM) discourages the excessive used of
📘 Explanation:
chemical pesticides
Q2.
Which of the following is not used as a biopesticide ?
📘 Explanation:
Xanthomonas campestris is not used as a biopesticide
Q3.
Organic farming does not include
📘 Explanation:
chemical fertilisers
Q4.
Organic farming includes
📘 Explanation:
all of these
Q5.
Living organisms used to enrich the nutrient quality of the soil are called as
📘 Explanation:
Living organisms used to enrich the nutrient quality of the soil are called as natural fertilisers
Q6.
Biofertilisers are
📘 Explanation:
These are some bacteria and cyanobacteria
Q7.
Biofertilisers are the living organisms which
Q8.
Which one of the following can be used as biofertiliser in cotton field ?
📘 Explanation:
Azotobacter chroococcum used as biofertiliser in cotton field
Q9.
The symbiotic association between fungi and roots of higher plants is referred to as
📘 Explanation:
mycorrhiza
Q10.
Cyanobacteria are
📘 Explanation:
Cyanobacteria are autotrophs
Q11.
Enzyme which has the fibrinolytic effect is
📘 Explanation:
Enzyme which has the fibrinolytic effect is streptokinase
Q12.
Statins used for lowering blood cholesterol level are extracted from
📘 Explanation:
Statins used for lowering blood cholesterol level are extracted from yeast
Q13.
Monascus purpureus is a yeast commercially used in the production of
📘 Explanation:
Monascus purpureus is a yeast commercially used in the production of blood cholesterol lowering statins
Q14.
During the primary treatment of sewage, solid particles that settle down are called
📘 Explanation:
solid particles that settle down are called primary sludge
Q15.
The purpose of biological treatment of waste water is to
📘 Explanation:
The purpose of biological treatment of waste water is to reduce BOD
Q16.
The masses of bacteria held together by slime and fungal filaments to form mesh-like structures are called as
Q17.
BOD is………..in polluted water and in potable water.
📘 Explanation:
more, less
Q18.
n the sewage treatment, bacterial floes are allowed to sediment in a settling tank. This sediment is called as
📘 Explanation:
This sediment is called as activated sludge.
Q19.
Which of the following steps is taken by the Ministry of Environment and Forests to protect rivers from water pollition ?
📘 Explanation:
Both (a) and (c)
Q20.
Methanogens, growing anaerobically on cellulosic material produce
📘 Explanation:
They produce methane, carbon dioxide and hydrogen.
Q21.
Which of the following bacteria is present in the rumen of cattle ?
📘 Explanation:
Methanobacterium is present in the rumen of cattle.
Q22.
Process of biogas production is
📘 Explanation:
Process of biogas production is anaerobic process
Q23.
Biogas is produced by
📘 Explanation:
Biogas is produced by both (b) and (c)
Q24.
Dragonflies are used to get rid of
📘 Explanation:
mosquitoes
Q25.
A microbial biocontrol agent that can be used to control butterfly caterpillars is
📘 Explanation:
Bacillus thuringiensis
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