QUESTION NO 1 : MCQ’s :
1: Which
cycle describe the movement of phosphorus through layers of Earth?
a) Phosphorus cycle b) Nitrogen cycle
c) Oxygen cycle d) Carbon
cycle
2: The
atmosphere does not play a significant role in the movement of phosphorus, why?
a)
Because
phosphorus-based compounds are usually solids at the typical ranges.
b) Phosphorus-based compounds are
usually liquid at the typical ranges.
c) Phosphorus-based compounds are
usually gases at the typical ranges.
d) None of the above
3: The
percentage of nitrogen in Earth's atmosphere is
:
a) 78% b) 50%
c) 12% d) 80%
4: Phosphorus
in lake water is usually regarded as divisible into two components:
a)
soluble phosphorus
& organic phosphorus.
b) organic phosphorus & inorganic
phosphorus.
c) soluble & insoluble phosphorus.
d) inorganic and insoluble phosphorus.
5: Important
processes in the nitrogen cycle include :
a) fixation,
ammonification, nitrification, and de-nitrification.
b) Detoxification , recycling ,
elimination
c) Conversion of other substances
d) None of the above.
6: Phosphorus
cycle is:
a) fastest
b) Slowest
c) Both at different level
d) None of these
7: It now
appears that most lakes contain relatively:
a)
Small amount of
phosphorus.
b) Large amount of phosphorus.
c) Both in different lakes
d) No phosphorus in lakes
8: The
ultimate source of phosphorus in lakes :
a)
Phosphorus-bearing rocks near to lakes
b) Organic matter.
c) Rain.
d) None
9: Soluble
phosphorus is delivered to a lake by which process :
a)
By Inflowing water with
help of erosive processes.
b) Wind
c) Rain
d) Living organisms.
10: Significant
correlations have been found between the phosphorus content and___
a)
Chlorophyll content in
water.
b) Oxygen content in water.
c) Carbonate content in water.
d) None
11: As the
summer progressed, the
phosphorus content:
a)
Became constant
b) Increase
c) Decrease
d) None of the above
12: Many
laboratory studies have indicated that phosphorus relationships are perhaps the
most critical with:
a)
Nitrogen
b) Oxygen
c) Carbon
d) Carbonates
13: Which
substance appear to be the most valuable indices of productivity:
a)
Phosphorus
b) Nitrogen
c) Carbonates
d) Ammonia
14: Major
changes global phosphorus cycle occur
through:
a)
Shipping of phosphorus
minerals and use of phosphorus fertilizers.
b) Artificial phosphorus production.
c) Industrial use.
d) No change.
15: The
primary biological importance of phosphates is :
a)
Energy storage within
cells (ATP).
b) Removal of waste.
c) Both.
d) None
16: The
primary source that contributes to eutrophication is considered as nitrogen and:
a)
Phosphorus
b) Oxygen
c) Carbonates
d) Ammonia
17: The most
abundant source of phosphorus on the planet is:
a) Soil
b) Water
c) Rocks formed from the Earth’s crust
d) Algae blooms
18: Which of
the following is NOT a critical function of Phosphorus:
a) Nucleotide formation
b) Cell membranes
c) Plant and animal growth
d) All of the above.
19: Excess
nitrogen is said to cause:
a) Kidney disease
b) High respiratory rate
c) Gas
disease in fishes
d) No effect
20: lotic water
contains more salts and ___ soluble nitrogen than lentic waters.
a) Less
b) Too much
c) Same amount
d) no
> All answers are highlighted in this
question .
QUESTION NO 2: SHORT ANSWERS:
1: Why phosphorus is essential element?
Ans:
Phosphorus is essential for life because it is used by all organisms
in the form of ATP. Energy is the
basic requirement of all organisms
phosphorus help the organisms in the
production of energy.
2: Name the
different steps of nitrogen cycle?
Ans: The steps of nitrogen cycle
1: Nitrogen fixation 2: Nitrification
3: Ammonification 4:
Assimilation
5: Di-nitrification
3: Draw the cycle of phosphorus?
Ans:
4: Draw the
cycle of nitrogen?
Ans:
5: What is
the rate of phosphorus input in phosphorus cycle?
Ans: In the
phosphorus cycle the rate of phosphorus input from the atmosphere is very low compared with most other
nutrient elements, so the supply in soil is precious.
6: What is
the major source input of phosphorus?
Ans: The
main inputs of phosphorus into the local ecosystem are from sparingly soluble
soil storage pools. In low phosphorus systems, vegetation constitute the
largest active pool of phosphorus and is efficient at internal recycling.
7: Which is
the main agent in nitrogen cycle?
Ans: Soil
microorganisms are the main agents of fixation of atmospheric nitrogen,
mineralization of nitrogen in organic matter and de-nitrification.
8: in which
form phosphorus is present?
Ans: Free
phosphorus does not occur in nature, but in the form of phosphates it is
abundant. It has been estimated that roughly 0.12 per cent of the earth's crust
is composed of combined phosphorus. Calcium phosphate is the common phosphate,
composing the principal part of "phosphate rock."
9: In which
form phosphorus present in lakes?
Ans: Phosphorus
present in lake water is usually
regarded as divided into two components:
1: Soluble
phosphorus which is in the phosphate form.
2: Organic
phosphorus which is contained in plankton organisms and other organic matter in
the water.
10: How
phosphorus entre into the Lakes?
Ans: The ultimate source is the phosphorus-bearing rocks
which are near the lakes. Soluble phosphorus delivered to the lake by inflowing
water which picked it up with erosive processes. Organic phosphorus, may also
be brought by tributaries.
Artificial additions
may occur in connection with pollution or soil fertilization.
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