Important Ecosystem- Zoology Questions for CBSE Class 12th

Match the trophic levels with their correct species examples in aquatic ecosystem. Column I Column II a. First trophic level i. Fish b. Second trophic level ii. Zooplankton c. Third trophic level iii. Bird d. Fourth trophic level iv. Phytoplankton

Which ecosystem has the maximum biomass?

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ?

The annual net primary productivity of the oceans is

How many food chains are present in the given food web

Which one of the following shows the correct grouping w.r.t given food web

How much solar energy plants can capture?

Which of the following is correctly matched?

In aquatic ecosystem, (i) is the major conduit for energy flow, as against in the terrestrial ecosystem, a much larger fraction of energy flows through the (ii) than (iii) . (i) (ii) (iii) 1. GFC DFC GFC 2. DFC GFC DFC 3. GFC GFC DFC 4. DFC DFC GFC

Which one of the following is the characteristics of a biological community?

How many of the following statements are incorrect ? (i) Decomposition is largely an anaerobic process. (ii) Fragmentation, leaching, and catabolism occur simultaneously on detritus. (iii) The vertical distribution of different species occupying different levels is called stratification. (iv) The pond is a deep water body. (v) The rate of decomposition is controlled by the chemical composition of detritus and climatic factors.

The mass of living material at a trophic level at a particular time is called

In an ecosystem the rate of production of organic matter during photosynthesis is termed as

When man eats fish which feeds on zooplanktons which have eaten small plants, the producer in this chain is

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? plant mice snake peacock

The two most important climatic factors that regulate the rate of decomposition are

Match the trophic levels with their correct species examples in grassland ecosystem. Column I Column II (a) Fourth trophic level (i) Crow (b) Second trophic level (ii) Vulture (c) First Trophic level (iii) Rabbit (d) Third Trophic level (iv) Grass

Decomposition is favoured by

Which of the following statements is not true?

Which type of pyramid of numbers would be obtained with the following data? a. One big tree b. Insects feeding on the tree c. Small birds eating insects d. Large birds eating small birds

The mass of living material in a trophic level at a particular time is called the

In a pond ecosystem consumers are formed by

The rate of decomposition is quicker when detritus is rich in

Match the column -I with column-II Column I Column II (a) Leaching (i) Accumulation of dark coloured amorphous substance (b) Fragmentation (ii) Degradation of detritus by bacterial and fungal enzymes (c) Catabolism (iii) Breakdown of detritus into smaller fragments (d) Humification (iv) Percolation of water-soluble nutrients into soil horizon.

A detritus food chain begins with

Net Secondary Productivity is equivalent to

The rate of production of organic matter during photosynthesis is called

The rate of formation of new organic matter by the consumers is called

The annual net primary productivity of the whole biosphere is approximately tons. (dry weight) of organic matter

The amount of energy that is fixed during photosynthesis is known as the

Which of the following undergoes decomposition at an extremely slow rate?

Which of the following is inverted?

Primary production in aquatic systems is limited mainly by

Which of the following statements is true about food chains, in general?

In the given food chain, the NPP at producer level is 50 J. How much will the the NSP of the tiger? Plant Deer Tiger

Which of the following terms describe the rate of formation of biomass in producers?

The biomass available for the consumption by the herbivores is termed

The fraction of energy lost when an organism proceeds from one trophic level to the next trophic level is

In a comparative analogy between the aeroplane and ecosystem (the rivet popper hypothesis) used by Paul Ehrlich, find out the correct matching. Column I Column II A. Rivets i Ecosystem B Aeroplane ii Species C Popping a rivet iii Key species D Rivets on the wings iv Proper functioning of ecosystem E Flight safety v A species to become extinct A B C D E 1 i ii iii iv v 2 ii i iv v iii 3 ii i v iv iii 4 ii i v iii iv

Select the correct difference between standing crop and standing state.

Identify the possible link ‘X’ in the following food chain. Plant Mosquito X Bird

Which one of the following shows a pyramid of biomass in a pond ecosystem?

Consider the following statements and select the correct option stating which ones are true (T) and which ones are false (F). (i) Pyramid of biomass is upright in the forest ecosystem and inverted in the grassland ecosystem. (ii) Pyramid of numbers is inverted in grassland and upright in aquatic ecosystem. (iii) Pyramid of energy depicts the rate of energy flow or productivity at successive trophic levels. (iv) Ecological pyramids have no place for detritivores and decomposers though they play an important role in an ecosystem. (i) (ii) (iii) (iv) (a) F F T T (b) T F T T (c) F T F F (d) T F F T

The rate of synthesis of organic matter by consumers is

Which of the following statements is incorrect ?

Select the wrong statement regarding energy flow in an ecosystem.

The fraction of energy lost when an organism proceeds from one trophic level to the next trophic level is

Select the incorrect statement from the following.

Primary productivity does not depend upon

The pyramid of energy in a forest ecosystem is

Secondary productivity is rate of formation of new organic matter by

Which one of the following processes during decomposition is correctly described?

Most animals that live in deep oceanic waters are

Which one of the following is a characteristic feature of cropland ecosystem?

The primary producers of the deep-sea hydrothermal vent ecosystem are

The term ecosystem was coined by

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in

What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g

Mark the incorrect statement about decomposition from the following.

The rate of production of organic matter during photosynthesis is termed

Which of the following ecological pyramids is generally inverted?

In a hypothetical tree ecosystem with only two trophic levels, a large number of insects are feeding on a big tree. Select the correct inference that can be drawn from the above information.

Which of the following is a characteristic of a community?

Decomposition rate is slower if the detritus is rich in

Which of the following statements is incorrect?

The rate of decomposition is faster in the ecosystem due to following factors EXCEPT

The number of trophic levels in the grazing food chain is restricted because

Energy flow in an ecosystem is

Which of the following cannot be assigned to a particular trophic level?

Which of the following organisms is not correctly paired with its role in the food chain?

Which of the following statements is not true ?

Which of the following statements is incorrect ?

Grazing food chain is the major conduit for energy flow in

Which of the following occupy top, middle and bottom layers in a tropical forest?

The available biomass for the consumption to herbivores and decomposers is

Following are terrestrial ecosystems, except

Which of the following is visualized as a functional unit of nature?

Stratification is a characteristic feature of

Which of the following has unidirectional flow?

The rate of formation of new organic matter by consumers is

The annual net primary productivity of the oceans is about

Water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. This process is termed

The most important climatic factors that affect decomposition are

Saprotrophs are an important component of

A sparrow is a

Food chains are generally shorter. It can be best explained by

In the sea

Which of the following trophic levels have the highest biomass in a terrestrial ecosystem?

What per cent of PAR is captured by the plants?

The rate of formation of new organic matter by consumers is termed

The annual net primary productivity of the whole biosphere is approximately

The net annual productivity of the terrestrial ecosystems on the Earth is about

Plants capture of PAR.

The total amount of energy fixed by photosynthesis is termed

Identify the possible link X in the following food chain. Grass Grasshopper Frog X Hawk

Which of the following organisms represent the second trophic level?

Which of the following can be considered as plant decomposers?

What per cent of energy is transferred from a lower trophic level to higher trophic level?

Pyramid of biomass is inverted in the case of

Which of the following ecological pyramids is the most functional representation of an ecosystem?

Rate of decomposition is

All the following factors are usually represented in the ecological pyramids of an ecosystem, except

In an aquatic ecosystem, a student observed that the lowest tier of pyramid of biomass was much narrower than the rest. The main producers of this ecosystem most likely are

Decomposition is a process that largely requires

Vertical distribution of different species occupying different levels is called

The functional aspects of ecosystem includes all the following except

Which of the following is incorrect about humus?

Ecological pyramid that is always upright depicts

Which of the following is not a functional aspect of ecosystem?

Select the incorrect statement from the following.

The Great Barrier Reef along the east coast of Australia can be categorized as

In an ecosystem the rate of production of organic matter during photosynthesis is termed as

Which of the following is the characteristics of a biological community?

leads to accumulation of a dark coloured amorphous substance called that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.

The food chain in which microbes split energy rich compounds of the producer community is

The total dry weight accessible to heterotrophs in an ecosystem will form the

Productivity is the rate of production of biomass expressed in terms of (i) kcal/m 3 /yr (ii) g/m 2 /yr (iii) g/yr (iv) kcal/m 2 /yr

Rate of biomass production is expressed as

The limitation of ecological pyramids is that

Find the incorrect statement.

Which one is not correctly matched?

The study of the energy transfer and relationships between all living organisms is known is

Among the following, more than one trophic level in a food chain can be occupied by

Which of the following is considered a man-made ecosystem?

Gross primary productivity is the

An inverted pyramid of number and an inverted pyramid of biomass are respectively seen in

Which of the following statement is not true?

Select the correct statement about productivity from the following.

All the following are correct statement about a small pond ecosystem, except

Which of the following processes of decomposition produces a substance resistant to microbial action?

During decomposition, the process of mineralisation by micro-organisms helps in the release of

In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is

Select the incorrect statement w.r.t decomposition.

Which one is not correctly matched?

Decomposition is inhibited in an

The rate of organic matter produced by producers in their bodies per unit time and area is called as

Refer to the given figure showing pyramid of number in a certain habitat. Identify A, B and C. A B C 1. Grass Rabbit Fox 2. Phytoplankton Small fish Large fish 3. Tree Birds Hawk 4. Tree Birds Parasites

The trees occupy the top vertical strata of a forest, shrubs the second and herbs and grasses occupy the bottom layers, this represents

What percentages of PAR can be captured by the plants?

The definition given below describes which of the following? “The mass of living material at a trophic level at a particular time”.

Secondary productivity is defined as

Based on the source of their nutrition or food, organism occupies a specific place in the food chain which is known as their

Which of the following statements is incorrect ?

Which of the following occur at the same trophic level?

How many of the following statement is/are correct about food chains? (a) GFC is the major conduit of energy flow in an aquatic ecosystem. (b) Source of energy in the detritus food chain is not directly the sun. (c) Detritus food chain may be connected to grazing food chain somewhere. (d) In a grazing food chain, the size of organisms always decreases at higher levels.

Select the incorrect statement from the following.

The trophic level of zooplankton living in an aquatic ecosystem will be

Which of the following represents the largest man made ecosystem?

Select the incorrect match from the following.

Read the following statements. (i) Removal of tigers from an area will result in increased growth of vegetation of that area. (ii) Organisms at each trophic level depend on those at the lower trophic level for their energy demands. (iii) Food chains are sustained by producers and decomposers. (iv) In a food chain, some organism like sparrow operates at one trophic level only. Select an option which shows correct statements.

The pyramid of biomass shows a sharp at higher trophic levels.

Which of the following is not a limitation of the ecological pyramid?

Out of the total energy received by a herbivore from producer, how much is passed to the carnivore?

Bacterial and fungal enzymes degrade the detritus into simple inorganic substances. This process is called

Choose the odd one out with respect to the functional aspects of ecosystem.

The rate of conversion of light energy into the chemical energy of organic molecules in an ecosystem is called

Of the total incident solar radiation, the proportion of PAR is

The energy available to the organism at the third trophic level is called

Which one is not correctly matched?

The productivity of the oceans is approximately the annual net primary productivity of the whole biosphere.

The rate at which light energy is converted into chemical energy of organic molecules in the ecosystem is

The rate of decomposition of detritus is accelerated

The amount of living biomass present in a unit area of an ecosystem at a given time is referred to as

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

What will happen if decomposers are completely removed from the ecosystem?

(A) Each trophic level, a certain mass of living material at a particular time called as (P) . (B) Breakdown of detritus into smaller particles, this process is called (Q) . Fill in the blanks with suitable word. P Q 1 decomposition mineralisation 2 production humification 3 standing crop fragmentation 4 standing crop stratification

Which of the following is not a characteristic feature of the humus?

The order of organism in an aquatic food chain is

The rate of conversion of light energy into the chemical energy of organic molecules in an ecosystem is called

In which of the following ecosystem, annual net primary productivity is about 55 billion tonnes?

The term (smallest sustainable unit of biosphere) was proposed by .

Find the incorrect statement.

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