Maximum solar energy may be trapped by

Correct! Wrong!

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Because in large water bodies the number of (producers) for food.

Earthworms help in the process of ____.

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Earthworms are Detritivorous organisms which help in the process of Fragmentation.

____ are not given any place in ecological pyramids.

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Saprophytes are not given any place in the ecological pyramid even though they play a very important role in the ecosystem.

Pyramid of numbers deals with number of

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Pyramid of number represents the number of individuals on each trophic level.

The developmental stages in a community are called ____.

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The developmental stages in a community are called Seral stages.

Stratification can be best observed in ____.

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Stratification or vertical distribution of different species occupying different levels of an ecosystem can be best observed in Tropical rainforests.

Phytoplankton in hydrosphere consist of ____.

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Phytoplankton in an hydrosphere consist of Pioneer community or the first community which develops during succession.

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called ____.

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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called Primary Productivity.

The largest vegetational group is known as

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The largest vegetational group is known as formation.

In an ecosystem which one is the natural controlling factor for population control ____.

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In an ecosystem it is predation which keeps the population under control. The other factors mentioned controls the type of organisms found.

In food chain, the largest population is that of

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Producers are the direct and indirect source of food for all the trophic levels. They are always more in number.

Pyramid of numbers in a pond ecosystem is

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Pyramid of numbers of pond ecosystem is upright.

Which one of the following is an abiotic process ____.

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Leaching is an abiotic process which does not involve any microbes. It is an early stage in the process of decomposition in which water soluble inorganic matter go down into the soil horizon and gets precipitated as unavailable salts. It leads to weight loss but no changes in chemical composition.

Which of the following is a man-made ecosystem?

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Agricultural crop fields are man-made ecosystems. The rest of the examples are natural ecosystems.

The basic requirement for any ecosystem to function and sustain is ____.

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The basic creating force which helps in functioning and sustaining an ecosystem is Solar energy.

In an ecosystem the function of the producers is

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In an ecosystem the function of the producers is to trap solar energy and convert into chemical energy

The efficiency of any ecosystem is best represented by pyramid of ____.

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The efficiency of any ecosystem depends on the amount of energy available in the trophic levels. Hence pyramid of energy will be an indication of the efficiency of any ecosystem.

Humus is good for plant growth because

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Humus is rich source of organic matter and it makes soil porous and increases its water holding capacity.

In any lithosphere, the pioneer community is ____.

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The pioneer community will comprise of lichens which are capable of producing acids which bring about weathering of rocks and formation of soil.

Grassland with scattered trees are called

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Grassland with scattered trees are called savanna.

An Owl feeding on mice represents ____.

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Mice can be primary or secondary consumer, so an owl feeding on mice can be a secondary or a tertiary consumer.

____ have only sedimentary type of nutrient cycle.

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Phosphorous has a sedimentary nutrient cycle as its main reservoir is in the earth’s crust. Nitrogen, Carbon and Oxygen have atmosphere as their main reservoir and are hence gaseous cycles.

Which of the following often limits Primary Productivity in an ecosystem-

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Primary productivity depends on Photosynthesis and hence the limiting factor would be Carbon.

Which one is the correct grazing chain?

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Grass → Grasshopper→ Frog → Snake → Eagle is the correct grazing chain.

The rate at which light energy is converted to the chemical energy of organic molecules is the ecosystem's

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The rate at which organic molecules are formed in a green plants is called gross productivity.

Inverted pyramid of biomass is seen in ____ ecosystem.

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In deserts the number and hence the biomass of producers is lesser than that of the herbivores and carnivores. Hence it is an inverted pyramid. The rest of them are upright pyramids.

Green plants constitute

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Because plants have the capacity of synthesizing food (producers).

Which of the following ecosystems have highest rate of gross primary production?

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Coral reefs are often called "rainforest of the sea". It forms some of the most diverse ecosystem on earth. Coral reef ecosystem have the highest gross primary productivity in the sea.

Trophic levels are formed by

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The trophic structure in any ecosystem is a kind of producer consumer arrangement. Here each food level is called trophic level.

Micro-organisms are

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micro-organisms such bacteria and fungi also act as decomposers.

Class 12th Biology - 14 Ecosystem MCQs
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Class 12th Biology - 14 Ecosystem MCQs