BIO 102 | Study Mode

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Question 201
A
intra specific competition
B
inter specific competition
C
predation on one another
D
mutualism.
Explanation
Competition is rivalry for obtaining the same resource. Competition is of two types, intraspecific and interspecific. Intraspecific competition is the competition amongst members of the same species for a common resource.

It may be for food, space, and mate. So if the density of elephant population in an area increases, it will lead to intraspecific competition. This will lead to the establishment of territories in elephants which will result in pushing out of the extra number securing shelter, mate and food for the rest.


Correct option: D
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Question 202
A
tropical deciduous forest
B
temperate evergreen forest
C
temperate deciduous forest
D
tropical rain forest.
Explanation
Net primary productivity is the total organic matter stored by producers per unit area per unit time. Gross primary productivity is the total organic matter synthesized by producers in the process of photosynthesis per unit area per unit time. So

Net primary productivity = Gross productivity Respiration and other losses.

Tropical rain forests occur over equatorial/subequatorial regions with abundant warmth and rainfall. Diversity and productivity are maximum as compared to other regions.


Correct option: D
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Question 203
A
Lantana camara, water hyacinth
B
water hyacinth, Prosopis cinereria
C
nile perch, Ficus religiosa
D
Ficus religiosa, Lantana camara.
Explanation
As opposed to native species, which are indigenous and found naturally in an environment, animals and plant species introduced from other countries and which are not otherwise found local are termed exotic. These introduced or exotic species can adversely affect the ecosystem.

In India, large varieties of exotic animal and plant species have been introduced from other parts of the world through the ages. Some exotic plants have turned into weeds, multiplying fast and causing harm to the ecosystem, e.g. water hyacinth and Lantam camara. Water hyacinth was introduced in Indian waters to reduce pollution. It has clogged water bodies including wetlands at many places resulting in death of aquatic orgnisms.


Correct option: A
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Question 204
A
blood-worms
B
stone flies
C
sewage fungus
D
sludge-worms.
Explanation
Some plants and animals act as the measure of existing environmental conditions because of their response to these conditions. The organisms are called bioindicators. From the given options, stone flies do not act as bioindicator of water pollution.


Correct option: B

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