BIO 102 | Study Mode

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Question 121
A
habitat and specific functions of a species
B
specific place where an organism lives
C
specific species function and its competitive power
D
none of these.
Explanation
Niche is specific part of habitat occupied by individuals of a species which is circumscribed by its range of tolerance, range of movement, microclimate, type of food and its availability, shelter, type of predator, and timing of activity.

A habitat has several ecological niches and supports a number of species. An ecological niche is used by a single species. Two or more species cannot use the same niche despite having a mutualistic association.


Correct option: A
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Question 122
A
Bhopal 1984, Ukrain 1986
B
Bhopal 1986, Russia 1988
C
Bhopal 1984, Ukrain 1990
D
Bhopal 1984, Ukrain 1988
Explanation
The Bhopal gas tragedy occurred on 3rd Dec. 1984 in which methyl isocyanate gas was released from a fertilizer manufacturing plant of Union Carbide causing death of approximately 2500 persons. Chernobyl disaster occurred on April 26, 1986, from an explosion at the chernobvl power station which released a huge radioactive cloud into the atmosphere in Ukrain.

Correct option: A
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Question 123
A
Lindemann
B
Tansley
C
Stanley
D
Weismann.
Explanation
Energy flow in an ecosystem is always unidirectional. Only 10% of the gross productivity of producers is entrapped by herbivores for their body building. Herbivores are eaten by carnivores. Only 10% of the herbivore productivity is utilized for raising productivity of primary carnivores. The rest is consumed in ingestion, respiration, maintance of body heat and other activities. Higher carnivores similarly are able to retain only 10% of energy present in primary carnivores. This is called the 10% law. It was given by Lindemann in 1942.

Correct option: A
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Question 124
A
C.vibrio
B
Entamoeba histolytica
C
E.coli
D
P.typhi.
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 125
A
water pollution
B
depletion of ozone layer
C
pollutants in air
D
use of detergents.
Explanation
Ozone layer or shield is present in stratosphere. It functions as a shield against strong UV radiations. Protection from UV radiations is proportional to thickness of ozone layer. Depletion in the concentration of ozone over a restricted area as spring time decline over Antartica is called ozone hole. Thinning of ozone layer increases the amount of UV-B radiations reaching the earth.

It would increase occurrence of cataract, skin cancers, herpes, dimming of eye sight, photo burning, deficient functioning of immune system.


Correct option: B
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Question 126
A
rhizomes
B
seeds
C
bulbs
D
corms.
Explanation
Therophytes are those plants that survive the winter as a seed and complete their life cycle between the spring and autumn.

Correct option: B
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Question 127
A
mammals and biosphere
B
mammals and biology programme
C
man and biology programme
D
man and biosphere programme.
Explanation
Man and biosphere programme is an international biological programme of UNESCO (United Nations Educational Scientific and Cultural Organisation) which was started in 1971 but was introduced in India in 1986. MAB has studied human environment, impact of human interference and pollution on biotic and a biotic environments and conservation strategies for the present as well as future.

Correct option: D
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Question 128
A
Europe
B
Africa
C
India
D
Antarctica.
Explanation
Depletion in the concentration of ozone over a restricted area as spring time decline over Antartica is called ozone hole. An ozone hole was discovered over Antartica by Faman et al, 1985. It is quite large (23 million square km in 1992 and 28.3 million square km in 2000). A small ozone hole also occurs over North Pole, it was discovered in 1990. Thinning of ozone shield has also been reported elsewhere (e.g., 8% between 30 50 N).

Correct option: D
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Question 129
A
mangroves
B
rain forest
C
grassland
D
coral reef.
Explanation
Gross primary productivity is the total rate of photosynthesis, including the organic matter used up in | respiration during the measurement period.

Tropical evergreen/rain forests occur over equatorial/ subequatorial regions with abundant warmth and rainfall (200-350 cm/yr) almost throughout the year. The forests are impenetrable (= jungle) with maximum diversity, e.g., 200 types of trees in one hectare, 70-80% of all insects 80 85% of all birds. Productivity is maximum here, 12000 kcal/m2/yr.


Correct option: B
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Question 130
A
sewage and phosphate rock
B
sewage and agricultural fertilizers
C
phosphate rock only
D
agricultural fertilizers only.
Explanation
Phosphate is an important compound of fertilizer which are added to crop fields and then are passed down to water bodies during rains through run off. It is also present in sewage that is dumped into the water body. This nutrient brings about dense growth of water plants especially the algae and cause algal bloom. This algal bloom leads to oxygen depletion in water bodies and causes death of aquatic life.

Correct option: B

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