BIO 102 | Study Mode

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Question 171
A
secondary production
B
tertiary production
C
gross production (GP)
D
net production (NP)
Explanation
Productivity is rate of accumulation of energy containing organic matter by an ecosystem per unit area per unit time. It is of two types primary and secondary. Productivity at producers level is known as primary productivity. It is two types. Gross primary productivity is primary productivity including that amount which is utilized in respiration and other metabolic activities. Net primary productivity (NPP) is primary productivity in excess to that which is utilised in respiration and other metabolic activities.

Secondary productivity is productivity at consumers level. Since gross production includes total production including the amount utilized in respiration and other metabolic activities so it is more than other forms of productivity.

NP = GP Respiration


Correct option: C
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Question 172
A
reacted with DDT
B
reacted with ammonia
C
reacted with CO2
D
reacted with water.
Explanation
Bhopal gas tragedy occurred on 3 Dec. 1984 in a Union Carbide pesticide plant. When water and MIC mixed, an exothermic chemical reaction started, which produced a lot of heat. As a result, the safety valve of the tank burst because of the increase in pressure. This burst was so violent that even the concrete around the tank also broke.

The high moisture content (aerosol) in the discharge while evaporating gave rise to a heavy gas which rapidly sank to the ground. It caused several of the following ailments like partial or complete blindness, disorders like, gastrointestinal disorders in many surviving people.


Correct option: D
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Question 173
A
20 g / 100 ml
B
30 g / 100 ml
C
4 6 g / 100 ml
D
10 g / 100 ml.
Explanation
Lead (Pb) is released by combustion of petrol as tetra ethyl lead is used as antiknock in petrol. This lead is very harmful and causes plumbism or lead poisoning, which disturbs nervous system, liver, kidneys in adults and also causes brain damage in children. About 150 to 400 mg of lead is stored in the body of an average adult and blood levels average about 25 pig/100 ml. Increase to 70 ng/100 ml of blood is generally associated with clinical symptoms. Hence a level of30 (ig/100 ml should be considered alarming.

Correct option: B
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Question 174
A
Laterite contains aluminium compound
B
Terra rosa most suitable for roses
C
Chernozems richest soil in the world
D
black soil rich in calcium carbonate.
Explanation
Black soil forms the largest group. It is developed mainly on the Deccan traps of Maharashtra, Madhya Pradesh and Kathiawar. Because of its hydrology and climatic conditions of the environment, the medium and deep black soils are very suitable for cotton cultivation. Laterite soil is rich in insoluble iron oxides and aluminium compounds, which gives laterites a reddish appearance. Chernozems are rich in nutrients (due to abundant organic rich compounds) and consequently the most fertile in the world.

Correct option: D
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Question 175
A
low stability and high resilience
B
high stability and low resilience
C
low stability and low resilience
D
high stability and high resilience.
Explanation
Stability can be defined as the power of a system to be in their state against unfavourable factors and resilience is the capability of regaining its original shape or position after being deformed. An ecosystem can be damaged easily and it must be having high resilence.

Correct option: A
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Question 176
A
stationary phase
B
senescent phase
C
lag phase
D
exponential phase.
Explanation
Maximum growth rate occurs in exponential or acceleration or log phase. The point at which the exponential growth begins to slow down is known as inflexion point.

Correct option: D
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Question 177
A
Lemna pancicostata
B
Eichhornia crassipes
C
Escherichia coli
D
Entamoeba histolytica.
Explanation
E. coli is the most common indicator of water pollution. It naturally occurs in the intestines of human beings and animals. They are commonly found in sewage and if E. coli is detected in water then it indicates fecal contamination. So if E. coli are detected in drinking water it indicates a serious health risk and that water-should not be used for drinking.

Correct option: C
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Question 178
A
shrub land
B
forest
C
desert
D
grassland.
Explanation
Deserts are places where the diurnal temperatures vary greatly. It is extremely hot during the day time and very cold at night. This change in temperature also affects the temperature condition of the soil.

Correct option: C
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Question 179
A
by tissue culture method
B
by creating biosphere reserve
C
by creating botanical garden
D
by developing seed bank.
Explanation
Biosphere reserves are multipurpose protected areas of different representative ecosystems which are meant for conservation of biodiversity or wild-life, traditional life tyle of tribals and their domesticated animals and also plant resources. Each biosphere reserve has a core zone (where no human activity is allowed), a buffer zone (with limited human activity) and manipulation zone (where human activity is allowed without degradation of ecology.

Thus the biosphere reserves protect not just wild varieties ies but also domesticated varieties of plants of an area.


Correct option: B
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Question 180
A
acidity
B
aridity
C
salinity
D
metal toxicity.
Explanation
Irrigation induced salinity can arise as a result of the use of any irrigation water, irrigation of saline water etc. combined with inadequate leaching. Since all surface and ground water contains salts to varying degrees, irrigation is often seen as the primary culprit for bringing salts into the field.

Correct option: C

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