A bird introduced from another country became a serious pest due to:
Better adaptation to new area
More sexual reproduction
Better nesting habitats
Absence of natural competition
Through resource partitioning:
Two species can compete for the same prey
Slight variation in niche allow closely related species to co-exist in the same habitat
Competitive exclusion results in the success of the superior species
Two species undergo character displacement that allows them to compete
The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do (i), (ii) and (iii) represent respectively?
(i)
(ii)
(iii)
(1)
Conformer
Regulator
Partial
regulator
(2)
(3)
(4)
When the value of 'r' is significantly low as compared to another species, it is better known by:
Competition exclusion
Interference competition
Resource partition
Competitive release
The four levels of biological organization to which Ecology is basically concerned are:
Macromolecules-tissues-populations-biome
Macromolecules-organisms-population-biome
Tissues-organs-community-biome
Organisms-Populations-Community-Biome
Physiological ecology
works at the organismic level
Tries to understand the adaptation with respect to survival only
Tries to understand the adaptation with respect to reproduction only
None of these
A wide variety of habitats within a biome can be a result of
Regional variation of temperature and precipitation.
Local variation of temperature and precipitation
Both 1 and 2
Natural selection
A. Life exists in compost pits, permafrost polar regions.
B. Our intestine host only 3-10 microbes.
C. Major biomes of India include desert rainforest and tundra.
D. The important physicochemical components alone characterise different habitats.
How many of the above statements is/are wrong?
Three
Two
Only one
All four
In aquatic habitats, the type of benthic animals is determined by
The grain size of soil at the bottom
Sediment characteristics
Percolating property of soil
topography of soil
When we talk about the constant internal environment of our body and of any other animal's body, we include
Optimal temperature
Osmotic concentration of body fluids
Environmental conditions affecting the internal system of organisms
Plants are
Regulators
Conformers
Partial Regulators
Partial Conformers
Shrews and Humming Birds are not capable of regulating body temperature because
Thermoregulation is energetically expensive
Higher surface area to volume ratio
Thermoregulation is not a function of energy
Every……….Keoladeo National Park…… in Rajasthan hosts thousands of migratory birds coming from …….
Summer, Udaypur, Himachal
Winter, Bharatpur, Siberia
Summer, Bharatpur, Madhya Pradesh
Winter, Jodhpur, Himachal
Bears going into hibernation is an example of
Escape in time
Escape in winter sleep
Diapause
Migration
Under unfavorable conditions…….. lakes and ponds are known to enter……… a stage of suspended development.
Zoospore, conform
Zoospore, diapause
Zooplankton, diapause
Zooplankton, conform
Migration is what kind of adaptation?
Physiological
Behavioural
Biochemical
Physical
Find the wrong match.
Kangaroo Rat: Internal Fat Oxidation
Opuntia: Morphological Adaptation
Fishes at ocean bottom: Anatomical Adaptation
Desert Lizards: Behavioural Adaptation
Calculate the birth rate of a population which has 20 individuals at time t, after one year 8 individuals have also counted along with those 20.
.3
0.2
0.4
0.8
The size of the population for any species is
Dynamic
Static
Both
Always Nt
Population Ecology links
Ecology to Evolution
Ecology to Genetics
Ecology to population Genetics and evolution
Ecology to diversity and evolution
Under normal circumstances which of the following affects population density most?
Nt
B
I
E
The innate potential to grow in number does not follow which of the following statements?
Each species has this ability
When resources are unlimited only then it is realized
This is an ideal situation.
Resource availability is not that essential for the unimpeded growth
The equation of the exponential growth curve of the population has 'r’ that means which of the following statements?
Extrinsic rate of natural increase
An important parameter for assessing impacts of only biotic factors on population growth
For Norway rat, it values is 0.15
For flour beetle, it is 0.12
What does K mean?
Nature's Carrying Capacity
Number of individuals of a species supported by nature as per the resources available
A maximum possible number of individuals of a species under practical circumstances.
All of these
In the V-PL growth curve, the asymptote is reached when
It's a lag phase
Just before the lag phase
At the time of curve reaching K
The time before deacceleration.
Evolution of population
Maximizing Reproductive fitness
Low r value
Minimizing Darwinian fitness
Both B and C
Which of the following will breed more than once in their life cycle?
Pacific salmon fish
Bamboo
Cuckoo
Both 1 and 3
The biological community can have
An isolated population of plants which doesn't depend on animals and microbes
An isolated population of animals which doesn't depend on plants and microbes
An isolated population of microbes which doesn't depend on plants and animals
No isolated population is possible there.
By a particular interaction in a population, one species was benefited while others was not affected at all. Such interaction is called as
Commensalism
Mutualism
Vandalism
Competition
By a particular interaction in a population, one species was harmed while other was benefited. Such interaction is called as
Predation
Parasitism
Both 2 and 3
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