Given below is a hypothetical pyramid of energy. The amount of energy left at the level of secondary consumers would approximately be:
Addition of which of the following can prevent leaching of minerals?
Detritus is
In most ecosystems, all the pyramids of number, energy and biomass are upright. It indicates that(a) Producers are more in number and biomass than the herbivores.(b) Herbivores are less in number and biomass than the carnivores.(c) Energy at a lower tropic level is always more than at a higher level.Choose the correct option.
What type of ecological pyramid would be obtained with the following data?
Secondary consumer: 120 g
Primary consumer: 60 g
Primary producer: 10 g
Inverted pyramid of biomass
Pyramid of energy
Upright pyramid of numbers
Upright pyramid of biomass
The primary producers of the deep-sea hydrothermal vent ecosystem are
green algae
chemosynthetic bacteria
blue-green algae
coral reefs
Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in:
Tropical Rain Forest
Grassland
Temperate Forest
Tropical Savannah
In which of the following both pairs have correct combination?
a
b
c
d
In an ecosystem the rate of production of organic matter during photosynthesis is termed as
net primary productivity
gross primary productivity
secondary productivity
net productivity
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
1.
Rock minerals
Detritus
Litter fall
Producers
2.
Litter
3.
4
1
2
3
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\
0.02 J
0.002 J
0.2 J
0.0002 J
Pheretima and its close relatives derive nourishment from
Sugarcane roots
Decaying fallen leaves and soil organic matter
Soil insects
Small pieces of fresh fallen leaves of maize
It occurs on a deforested site
It follows primary succession
It is similar to primary succession except that it has a relatively slow pace
All of the above
mangroves
tropical rainforests
alpine forests
temperate forests
temperate deciduous forests
scrub forests
tropical rain forests
Which of the following ecological pyramids is generally inverted?
Pyramid of biomass in a sea
Pyramid of numbers in grassland
Pyramid of biomass in a forest
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
Gross primary productivity is always more than Net primary productivity.
Gross primary productivity and Net primary productivity are one and same.
There is no relationship between Gross primary productivity and Net primary productivity.
Gross primary productivity is always less than net primary productivity.
Match the trophic levels with their correct species examples in the green land ecosystem
(a) Fourth trophic level (i) Cow
(b) Second trophic level (ii) Vulture
(c) First trophic level (iii) Rabbit
(d) Third trophic level (iv) Grass
Select the correct option:
(a) (b) (c) (d)
(iii) (ii) (i) (iv)
(iv) (iii) (ii) (i)
(i) (ii) (iii) (iv)
(ii) (iii) (iv) (i)
Which of the following statements is incorrect regarding the phosphorus cycle?
Phosphates are the major form of phosphorus reservoir
Phosphorus solubilizing bacteria facilitate the release of phosphorus from organic remains
There is the appreciable respiratory release of phosphorus into the atmosphere
It is a sedimentary cycle
The rate of decomposition is faster in the ecosystem due to the following factors EXCEPT:-
Detritus rich in sugars
Warm and moist environment
Presence of aerobic soil microbes
Detritus richer in lignin and chitin
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :
(a)
(b)
(c)
(d)
dog
squirrel
bat
Deer
Rat
Dog
Tortoise
crow
Squirrel
Cat
Pigeon
Rabbit
Frog
Which of the following representations shows the pyramid of numbers in a forest ecosystem –
In the equation GPP - R = NPP
R represents:
Environment factor
Respiration losses
Radiant energy
Retardation factor
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