Which of the following ecosystem types has the highest annual net primary productivity ?
Tropical rain forest
Tropical deciduous forest
Temperate evergeen forest
Temperate deciduous forest
Which one of the following is not used for construction of ecological pyramids?
Dry weight
Number of individuals
Rate of energy flow
Fresh weight
Photosynthesis is absent in
aphotic layer
photic layer
benthic layer
pelagic layer.
The given type of ecological pyramid represents
pyramid of numbers in tree ecosystem
pyramid of biomass in a fallow land
pyramid of biomass in a lake
energy pyramid in a spring
Which of the following zones of a lake is habitat for snails, slugs and microorganisms?
Littoral
Limnetic
Benthic
Profundal
Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considered
as occupying
first trophic level
second trophic level
third trophic level
fourth trophic level.
What is PAR range?
200 nm - 800 nm
(2) 400 nm - 700 nm
350 nm - 550 nm
(4) 600 nm - 100 nm
The bacteria which attack dead animals are
Second link of the food chain and are herbivorous
third link of the food chain and are tertiary consumers
the end of food chain and are decomposers.
Animals take phosphours from
plants
rock
soil.
Most animals that live in deep oceanic waters are
Tertiary consumers
Detritivores
Primary consumers
Secondary consumers
Keystone species deserve protection because these
are capable of surviving in harsh environmental conditions
indicate presence of certain minerals in the soil
have become rare due to overexploitation
play an important role in supporting other species.
Energy flow in an ecosystem is
unidirectional
bidirectional
multi-directional
All the these
In a stable ecosystem, which of the following limits the number of trophic levels?
Biomass
The number of nutrients
Availability of nutrients
Presence of contaminants that increase in concentration along the food chain
Most of the world's carbon is found:
As carbon dioxide in the atmosphere.
In living organisms.
As bicarbonate and carbonate ions dissolved in the oceans.
As carbonate minerals in sedimentary rock.
Photosynthesis and respiration are central to which cycle?
The carbon cycle
The phosphorus cycle
The sulfur cycle
The phosphorus cycle differs from the carbon cycle in that:
Which of the following changes would not result in an increase in net primary production?
Increased precipitation in an and area
Increased soil fertility
Increased latitude (moving from the equator toward the poles)
Moving down a mountain to warmer temperatures
Grasslands can support greater grazing rates by herbivores than forests because:
Grasslands receive more sunlight
The net production of grasslands is greater
Grasslands produce less woody plant tissue
More of the grassland production is above ground
The amount of energy reaching an upper trophic level is determined by:
Net primary production
Net primary production and the efficiencies with which food energy is converted to biomass
Gross primary production
Gross primary production and the efficiencies with which food energy is converted to biomass
Which of the following is false?
I. Quantity of biomass in a trophical level at a particular period is called standing crop.II. The energy content in a trophic level is determined by considering a few individuals of a species in that trophic level.III. The succession that occurs in nearly cooled lava is called primary succession.IV. Rate of succession is faster in the secondary successionV. Phytoplankton are the pioneers in aquatic succession
Only II
Only III
Only V
Only I and IV
The amount of biomass or organic matter produced per unit area over -a time period by plants during photosynthesis is called primary production, which is expressed as:
g m−2
kcal m−2
(kcal m−2) yr−1
Both (1) and (2)
An ecosystem, which can be easily damaged, but can recover after some time if damaging effect stops will be having:
High stability and high resilience
Low stability and high resilience
High stability and low resilience
Low stability and low resilience
During the stages of succession in a given ecosystem the following changes in characteristics may be observed:
Which one of the characteristics, A, B, C, D or E is responsible for the apparent high degree of stability associated with a climax ecosystem?
B
D
A
E
Perturbation of which of the following cycles contributes most to global warming?
The global carbon cycle
The global water cycle
The global nitrogen cycle
All of these cycles contribute equally
Some of the stages in the hydrarch are labelled as:
A. Marsh meadow stageB. Reed swamp stageC. Submerged plant stageD. Phytoplankton stageE. Submerged free floating plant stage
Identify the choice that represents the correct sequence of these stages:
D, C, E, B and A
C, E, A, B and D
B, D, C, A and E
D, E, C, B and A
Read the following statements carefully.
(i) Primary succession is a very slow process taking thousands of years for the climax to be reached.(ii) Energy at a higher trophic level is always more than at a, lower level.(iii) Bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called fragmentation.(iv) All succession whether taking place in water or on land, proceeds to a similar climax community - the mesic.
Which of the two above statements are correct?
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(iii) and (iv)
The removal of 'Keystone' species will affect:
The producers
The consumers
The ecosystem
The decomposers
Which of the following is the functional unit of nature?
A plant
An animal
Ecosystem
Environment
Identify the odd one out?
Forest
Grassland
Desert
Wetland
Which of the following is not a man-made ecosystem?
Pond
Crop-field
Swimming pool
Both ‘1’ and ‘3’
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