Ecosystem

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

Which one of the following is a primary consumer
in maize field ecosystem ?

Which two distinct microbial processes are
responsible for the release of fixed nitrogen as
dinitrogen gas (N2) to the atmosphere ?

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

Secondary productivity is rate of formation of new organic matter by :

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

Natural reservoir of phosphorus is :

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

Identify the possible link "A" in the following food chain :
Plant → insect → frog →"A"→ Eagle

The upright pyramid of number is absent in

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

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

The second stage of hydrosere is occupied by plants like

Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :

The rate of formation of new organic matter by rabbit in a grassland, is called :

Of the total incident solar radiation the
proportion of PAR is

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

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

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

The breakdown of detritus into smaller particles
by earthworm is a process called

Which one of the following animals may occupy
more than one trophic levels in the same
ecosystem at the same time ?

Both, hydrarch and xerarch successions lead to :

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

Which of the following representations shows
the pyramid of numbers in a forest ecosystem ?

The correct sequence of plants in hydrosere is :

Which one of the following types 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 slow rate of decomposition of fallen logs in
nature is due to their:

About 70% of total global carbon is found in:

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

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

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

Which of the following plants are used as green
manure in crop fields and in sandy soils ?

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

Plant Decomposers are : -

Which is the reason for highest biomass in
aquatic ecosystem ?