1. Chinese Brake fern (Pteris vittata) is hyperaccumulator of:
.jpg "Chinese Brake fern (Pteris vittata) i")
a)
Cadmium
b) Arsenic
c)
Chromium
d) Lead
2. In bioremediation by microorganisms detailed below, choose
INCORRECT option?
a)
The organic contaminants provide a source of carbon
b) The bacteria do not get energy by degrading, contaminants
c)
Bacteria can produce oxydized and reduced species that can cause metals to
precipitate
d)
Bacteria act on contaminants by aerobic and anaerobic respiration
3. Microbial leaching involves the process of dissolution of metals
from ore breaking rocks using microorganisms. Which one of the following
bacteria helps in leaching copper from its ore?
a) Acidithiobacillus ferroxidans
b)
Pseudomonas putida
c)
Deinococcus radiodurans
d)
Rhodopseudomonas capsulate
4. Desulphovibrio desulfuricans (A) and Pseudomonas species (B)
are involved in mercury bioremediation. Which of the statement below is
correct?
a) A converts
methyl mercury to mercuric ion, B converts mercury to methyl mercury
b)
A converts mercury to methyl mercury, B converts mercury to mercuric ions
c) A converts mercury to methyl mercury, B
converts methyl mercury to mercuric ions
d)
A converts methyl mercury to mercuric ions, B converts mercury to mercury ions
5. The following are certain facts regarding bioremediation:
A.
Biodegradable plastics are made using polyhydroxy alkanoates (PHAS) such as
polyhydroxybutyrate (PHB).
B.
Pseudomonas putida F1 bacterial strain is involved in degradation of aromatic
hydrocarbon.
C.
The bacterium Deinococcus radiodurans consume and digest toluene and ionic
mercury from highly radioactive nuclear waste.
D.
Bioaugmentation is a process of improving the microorganisms already existing
in the system for
degradation
of xenobiotic compound.
Which
one of the following combinations of above statements is correct?
(1)
A, B and C
(2) A, B and D
(4)
B, C and D
(3)
A, C and D
6. Which of the following does not represents strategy for phytoremediation?
a)
Phytodegradation
b)
Phytomining
c)
Continuous removal through hyper accumulators
d) Chelate mediated extraction of pollutants
7. The process of phytoremediation where complexation and
immobilization of toxin takes place within the so it is called
a)
phytoextraction.
b)
phytodegradation
c)
phytovolatilization
d) phytostabilization
8. Release of nutrients, oxidants or electron donors into the environment
to stimulate naturally Occurring microorganisms to degrade a contaminant, is
referred to as
a) biostimulation
b)
phytoremediation
c)
bioaugmentation
d) bioremediation
9. A plot of soil contaminated with diesel oil was inoculated with
oyster mushrooms. After 4 weeks, more than 95% of the polycyclic aromatic
hydrocarbons had been reduced to non-toxic compounds. This process is called
a)
phytoremediation
b)
chemoremediation
c) mycoremediation
d)
zooremediation
10. Microorganisms having nitrilase activity can be enriched from
soil samples by supplying nitriles as the sole nitrogen or carbon source in the
growth medium. A problem with this approach is that false positive strains may
be isolated, which use nitrites to produce amide with the help of a different
enzyme activity such as
a)
phosphorylases
b) phosphatases
c)
hydratases
d)
phosphoestarases
a) Alcanivorax
b) Oleispira
c) Marinobacter
d) All the above
12. Which among the following is a genetically engineered super bug utilized in petroleum biodegradation?
a) Pseudomonas putida
b) Bacillus cereus
c) Acetobacter
d) None of the above
Answers:
1. b) Arsenic
2. b) The bacteria do not get energy by degrading, contaminants
3. a) Acidithiobacillus ferroxidans
4. c) A converts mercury to methyl mercury, B converts methyl mercury to mercuric ions
5. (2) A, B and D
6. d) Chelate mediated extraction of pollutants
7. d) phytostabilization.
8. a) biostimulation
9. c) mycoremediation
10. b) phosphatases
11. d) All the above
12. a) Pseudomonas putida
