Self Studies
Self Studies
Self Studies
Self Studies

Microbes in Human Welfare Test - 62

Result Self Studies

Microbes in Human Welfare Test - 62
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    The technology of biogas production was developed in India mainly by
    Solution
    Biogas is an alternate source of energy produced by the anaerobic digestion of biomass such as animal excreta and kitchen wastes. The biogas plant was first installed in 1941 at IARI. The distinctive features of the plant were a well type digester and a mild steel gasholder, which was balanced by a counterweight connected through ropes and supporting poles. The KVIC and the Planning Research and Action Division (PRAD), tried to promote the IARI design. Thus, the correct answer is option C.
  • Question 2
    1 / -0
     Which of the following is useful for us?
    Solution
    Pheretima (earthworm), also called as 'farmer's friend'. They help to degrade the biodegradable waste present in the soil and change them to compost which improves many soil attributes like structure, water holding capacity, moisture content etc., and also increases nutrient availability.
    Musca domestica is housefly. It acts as a carrier for several diseases and thus harmful to human health. Periplaneta is cockroach and is also a carrier for various pathogenic diseases.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?
    Solution
    Correct Option: C
    Explanation:

    • Statins are a class of drugs used to lower cholesterol levels by inhibiting the enzyme HMG-CoA reductase, which plays a central role in the production of cholesterol in the liver. It is produced by the yeast in large scale.
    • Acetobacter aceti is a gram-negative bacterium and proved it to be the cause of conversion of ethanol to acetic acid and thus, used for the large production of acetic acid.
    • Butyric acid is a product of the organism Clostridium butylicum and lactic acid is produced by the lactic acid bacteria.
    • Aspergillus niger is a fungus and is used in the industrial preparation of citric acid and gluconic acid.
    • Therefore, the correct answer is option C.
  • Question 4
    1 / -0

    Directions For Questions

    Soda-lime is a mixture of sodium hydroxide and calcium hydroxide and can be used to measure the rate of $$CO_2$$ production by soil microorganisms. It reacts with $$CO_2$$ as follows:
    $$Ca(OH)_2 + 2 NaOH + 2CO_2 \rightarrow  CaCO_3 + Na_2CO_3 + 2H_2O$$
    Assume the following:
    I. Weight of dry soda lime just before the experiment: A gm
    II. A gm soda-lime incubated with soil in an airtight container for 4 days and weighed: B gm
    III. A gm soda-lime incubated without soil in an airtight container for 4 days and weighed: C gm
    IV. Sample II dried and weighed: $$B_d$$
    V. Sample III dried and weighed: $$C_d$$
    (Assume that soil moisture has no effect on the results)

    ...view full instructions

    Amount of $$CO_2$$ present in air inside the container.
  • Question 5
    1 / -0
    The main reason why antibiotics could not solve all the problems of bacteria mediated diseases is
    Solution
    • A mutation is the sudden heritable change in the genome of the bacteria or any other living organism.
    • Antibiotics act by increasing the membrane permeability of bacteria which leads to loss of cellular fluids and finally death of bacteria. 
    • Due to the sudden change in the genome, they start producing a variable protein that provides resistance to antibiotics.

    So, the correct answer is option D.
  • Question 6
    1 / -0
    The most common trait that was improved in commercialized crops was
    Solution
    Insects were the major problem for farmers because large number of crops were moslty damaged by the insects. But genetic engineering helps a lot in this field. With the advent of genetic engineering, genes for insect resistance now can be moved into plants more quickly and deliberately. Bt technology is only one example of ways genetic engineering that may be used to develop insect resistant crops now and in the future.
  • Question 7
    1 / -0
    The recently discovered antibiotic Griseofulvin is produced by
    Solution
    Griseofulvin is a fungistatic antibiotic produced by Penicillium griseofulvum. It is used orally for treatment of fungal infections of the skin and nails in both animals and humans. It can also be produced by the mycelial fungus Penicillium patulum. 
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Streptomycin is obtained from
    Solution
    Streptomycin is an antimycobacterial drug which is used in the treatment of tuberculosis. It is derived from Gram-positive bacteria Streptomyces griseus. This is a rod-shaped bacterium which is commonly used for the production of this antibiotic. 
    Thus, the correct answer is option A. 
  • Question 9
    1 / -0
    During biogas production, acetic acid is transformed into the final product by the enzymes of
    Solution
    The biogas process comprises of four stages (hydrolysis, acidogenesis, acetogenesis, methanogenesis) which are catalysed by different and specialised microorganisms. Methane fermentation is the consequence of a series of metabolic interactions among various groups of microorganisms. The first group of microorganisms secrete enzymes which hydrolyze polymeric materials to monomers such as glucose and amino acids, which are subsequently converted to higher volatile fatty acids, H$$_2$$ and acetic acid. In the second stage, hydrogen-producing acetogenic bacteria convert the higher volatile fatty acids e.g., propionic and butyric acids, produced, to H$$_2$$, CO$$_2$$, and acetic acid. Finally, the third group, methanogenic bacteria convert H$$_2$$, CO$$_2$$, and acetate, to CH$$_4$$ and CO$$_2$$.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    Argol, a brown crust, formed during the fermentation of grape juice contains
    Solution
    After the fermentation of grape juice, a brown crystalline crust is formed. This is known as Agrol or wine-lees and it is tartaric acid in the form of the acid potassium salt.
    So, the correct answer is 'Potassium hydrogen tartarate'.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now