Chapter: Ecosystem

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

Which ecosystem has the maximum biomass?

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

The term ecosystem was coined by

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

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

Which one of the following is not a functional unit of an ecosystem?

Quercus species are the dominant component in

The slow rate of decomposition of fallen logs in nature is due to their

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops, will be having

Which of the following is the most stable ecosystem?

What is true of ecosystem?

In an ecosystem, which one shows one-way passage

Decomposers are organisms that

In the equation GPP − R = NPP, R represents

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

Which of the following statements is incorrect?

Match the trophic levels with their correct species examples in grassland ecosystem.
Column I                                           Column II
A. Fourth trophic level                 1. Crow
B. Second trophic level                2. Vulture
C. First trophic level                     3. Rabbit
D. Third trophic level                   4. Grass
Select the correct option.

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

Most animals that in deep oceanic water are

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

Secondary productivity is rate of formation of new organic matter by

Identify the likely organisms I, II, III and IV in the food web shown below.

 

Identify the possible link ‘A’ in the following food chain
Plant → Insect → Frog → ‘A’ →Eagle

Mass of living matter at a trophic level in an area at any time is called

Of the total incident solar radiation the proportion of PAR is

The biomass available for consumption by the herbivores and the decomposers is called

The correct sequence of plants in a hydrosere is

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

Consider the following statements concerning food chains.
I. Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
II. Removal of most of the carnivores resulted in an increased population of deers
III. The length of food chains is generally limited to 3-4 trophic levels due to energy loss
IV. The length of food chains may vary from 2 to 8 trophic levels
Which of the two above statements are correct?

Which of the following ecosystem types has the highest annual net primary productivity?

Which of the following is expected to have the highest value (gm /m² /yr) in a grassland ecosystem?

Bamboo plant is growing in a far forest then what will be the trophic level of it?

The transfer of energy from one trophic level to another is governed by the 2nd law of thermodynamics. The average efficiency of energy transfer from herbivores to carnivores is

The rate at which light energy is converted into chemical energy of organic molecules is theecosystem’s

Which of the following ecosystem has the highest gross primary productivity?

In a biotic community, the primary consumers are

If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because

In grass-deer-tiger food chain, grass biogass is one tonne. The tiger biomass shall be

Second most important trophic level in a lake is

Food chain in which microorganisms breakdown the food formed by primary producers are

Pick up the correct food chain.

Upper part of sea/aquatic ecosystem contains

Which of the following statemen is not correct?

Which of the following ecological pyramids is generally inverted?

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

During ecological succession

Match the following and select the correct option.
Column I                                 Column II
A. Earthworm                     1. Pioneer species
B. Succession                      2. Detritivore
C. Ecosystem service         3. Natality
D. Population growth        4. Pollination

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?

The upright pyramid of number is absent in

The second stage of hydrosere is occupied by plants like

Which one of the following statements is correct for secondary succession?

Which one of the following statements for pyramid of energy is incorrect whereas the remaining three are correct?

Which one of the following is not used for constructing of ecological pyramids?

The greatest biomass of autotrophs in the world’s oceans is that of

In a terrestrial ecosystem such as forest, maximum energy is in which trophic level?

In a food chain, the largest population is that of

The nature of climax community ultimately depends on

The primary succession refers to the development of communities on a

The pyramid which cannot be inverted in a stable ecosystem is that of

Pyramid of number deals with number of

Pyramid of number in a pond ecosystem is

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as

Which of the following statements is incorrect regarding the phosphorus cycle?

In which of the following both pairs have correct combination?

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks
       A                                 B                                  C                                   D
(P) Rock minerals              Detritus                      Litter fall                       Producers
(Q) Litter fall                      Producers                   Rock minerals              Detritus
(R) Detritus                        Rock minerals            Producer                       Litter fall
(S) Producers                     Litter fall                     Rock minerals              Detritus

Natural reservoir of phosphorus is

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

About 70% of total global carbon is found in

Which one of the following pair is mismatched?

If by radiation all nitrogenase enzymes are inactivated, then there will be no

Which of the following pair is a sedimentary type of biogeochemical cycle?

The main role of bacteria in the carbon cycle involves

Bulk CO₂ -fixation occurs in