In India, plants with pneumatophores are found in ____.

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Pneumatophores are associated with mangroves which are found in the Sunderbans.

A stage of suspended development is called ____.

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A stage of suspended development is called diapause. It is seen in zooplanktons during unfavourable conditions.

During parasitic life, the parasite is likely to lose

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During parasitic life, the parasite is likely to lose all unnecessary sense organs. It however has adhesive organs and suckers. It also respires anaerobically.

The sum total of the populations of the same kind of organisms constitute

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A species is a group of individuals of same kind of phenotypic characters and can interbreed easily.

Migration is seen ____.

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Migration is generally seen in organisms which are conformers i.e.organisms which cannot maintain a constant internal environment.

A mutually beneficial association necessary for survival of both partners is

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Symbiosis or mutualism is a mutually beneficial association necessary for the survival of both the partners.

The Monarch butterfly and the Viceroy butterfly are an example of ____.

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The Monarch butterfly and the Viceroy butterfly are an example of Mimicry. Here the monarch butterfly is the model which is distasteful to its enemies. The Viceroy is the mimic which escapes predation by looking like the Monarch butterfly.

Soil particles size determine its

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Soil particles size defines its texture. The mineral particles present in soil, vary enormously in size.

Xeric environment is characterised by

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Xeric environment is found in deserts where temperature remains high in the day and low during the night and air humidity is very low.

When births are equal to deaths , then it is called ____.

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When births are equal to deaths , then it is called plateau stage of the growth curve.

Maximum productivity and biomass occurs in ____.

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Tropical Rain forests have maximum productivity and biomass production because of ideal temperature, light and rainfall conditions prevailing in these regions.

Geometric representation of age structure is a characteristic of

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Geometric representation of age structure is a characteristic of population.

Production of antibiotic Penicillin by fungi is an example of ____.

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In this relationship, the fungi which is the strong partner produces chemicals/antibiotics which kills the bacteria which is a weak partner.Such a relationship is called Ammensalism.

Which of the following communities is more vulnerable to invasion by outside animals and plants?

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This is so because oceanic islands are normally cut off from other habitats.

Marine organisms are ____.

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Marine organisms can survive in a narrow range of high saline conditions and are hence stenohalines.

Keystone species in an ecosystem are those

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The keystone species in an ecosystem are those who are the main contributors to the ecosystem.

Density of a population is represented by ____.

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Density of a population is determined by number of individuals of a species /unit area.

The semilog of per minute growing bacteria is plotted against time.What will be the shape of graph?

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Semilog of per minute growing bacterium when plotted against time, would yield ascending straight line.

One of the following is an abiotic component ____.

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Humus is an abiotic component .

Floating leaves of aquatic plants have ____.

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Floating leaves have stomata on the upper surface.

Two plants can be conclusively said to belong to the same species if they

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When the members of a species are inter-fertile and produce fertile offspring.

Interspecific interactions arise from ____.

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Interspecific interactions arise from interactions of population of two different species.

Submerged hydrophytes have well developed ____.

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Submerged hydrophytes have well developed aerenchyma cells which helps in floating.

Orchids which are found on Mango trees are an example of-

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This is an example of Commensalism in which the mango tree is neutral ( neither benefit nor harm) while the Epiphyte is benefited.

Loop of Henle is the longest in

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The longer the loop of Henle the more is the water reabsorbed by it. Desert animals have very long loops of Henle to help in reabsorption of water and hence in water conservation.

In which of the following habitats does the diurnal temperature of soil surface vary most?

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Desert shows maximum difference between day and night temperature.

The formula for exponential population growth is

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The formula of exponential growth is where is the rate of change in population size, r is the biotic potential and N is the population size.

In food chain, the largest population is that of

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Number of individuals decreases at successive trophic levels.

A population contains more of younger people because of ____.

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A young population is indicative of short life span and high birth rate.

A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil is

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High organic matter darkens the colour of soil.

Class 12th Biology - 13 Organisms and Environment MCQs
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Class 12th Biology - 13 Organisms and Environment MCQs