Organisms and Populations - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Organisms and Populations - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Homeostasis is
(a) tendency to change with change in environment
(b) tendency to resist change
(c) disturbance in regulatory control
(d) plants and animals extracts used in homeopathy
If global warming continues, how would the distributional range of some species be affected?
1. There will be a poleward shift
2. There will be an equatorial shift
3. No change expected for any species
4. Shift to marine water from land
When exposed to cold temperatures, which of the following is responsible for maintaining constant body temperature in humans?
1. Vasoconstriction and shivering
2. Vasodilation and shivering
3. Vasodilation and sweating
4. Vasoconstriction and sweating
Under unfavorable conditions, many zooplankton species in lakes and ponds are known to enter a stage of suspended development called as:
1. Dormancy
2. Hibernation
3. Aestivation
4. Diapause
The given age pyramid represents a:
1. Fast expanding population
2. Slowly expanding population
3. Stable population
4. Declining population
Under a particular set of selection pressures, organisms evolve towards the most efficient:
1. Thermoregulation
2. Water conservation
3. Respiration
4. Reproduction strategy
A species whose distribution is restricted to a small geographical area because of the presence of a competitively superior species is found to expand its distributional range dramatically when the competing species is experimentally removed. This is called:
1. Competitive Exclusion
2. Competitive Release
3. Competitive Supremacy
4. Competitive Inclusion
To get pollinated by a bee, the Mediterranean Orchid, Ophrys, employs:
1. Sexual deceit
2. Pseudo-copulation
3. Reward in the form of Nectar
4. Place for laying eggs
While heat gain or heat loss is the function of ______, heat production is the function of ________ of the body of an animal.
1. Volume; Surface area
2. Surface area; Volume
3. Volume; Volume
4. Surface area; Surface area
Gause's principle of competitive exclusion is, essentially:
1. the more abundant species will exclude the less abundant species through competition
2. competition for the same resources excludes species having different lifestyles
3. no two species can occupy the same niche indefinitely when resources are limited
4. larger organisms exclude smaller ones through competition as in the case of large trees controlling underbush.
Which one of the following are important biotic factors that can affect the structure and organization of biological communities?
1. Temperature and rainfall
2. Nutrient availability and soil pH
3. Predation and competition
4. Light intensity and seasonality
The country with the given population pyramid is likely to have:
1. Low birth rate
2. High death rate
3. Declining population in future
4. More females than males
In a tide pool, 15 species of invertebrates were reduced to 8 after one species was removed. The removed species may be a:
1. Parasite
2. Mutualist
3. Top predator
4. Herbivore
Organisms with very high intrinsic growth rates have:
1. Long generation times
2. Short generation times
3. No courtship behaviour
4. No carrying capacities
Members of a population
(1) Can interbreed and produce fertile offsprings
(2) Share a common gene pool
(3) Share or completer for similar resources
(4) More than one option is correct
Ecology is basically concerned with how many basic levels of organisation?
(1) Three
(2) Two
(3) Four
(4) Eight
Permafrost condition is characteristic feature of
(1) Hot desert biome
(2) Cold desert biome
(3) Savanna biome
(4) Chaparral biome
Find out incorrect match
(1) Topographic factors - soil texture
(2) Edaphic factors - Soil factors
(3) Climatic factors - Wing, humidity
(4) Physiography factors - Mountain slope
Mango, tuna fish, snow leopards are
(1) Euryhaline
(2) Stenothermal
(3) Euythermal
(4) Eurythermal & euryhaline
Match Column I with Column II and choose correct option
Column I Column II
(Means of transport) (Soil type)
(a) Water (i) Colluvial
(b) Air (ii) Alluvial
(c) Gravity (iii) Eolian
(1) a(i), b(ii), c(iii)
(2) a(i), b(iii), c(ii)
(3) a(ii), b(iii), c(i)
(4) a(iii), b(i), c(ii)
Warm blooded animals like mammals from colder climates generally have shorter ear and limbs. This is an explanation of
(1) Jordan's rule
(2) Allen's rule
(3) Rensch's rule
(4) Bergman's rule
'Resource partitioning' is an important mechanism which promotes
(1) Competitive release
(2) Co-existence
(3) Competitive exclusion
(4) Antibiosis
Select the incorrect match with respect to interspecific interaction
Species A Species B Interaction
(1) + + Mutualism
(2) + - Parasitism
(3) + + Commensalism
(4) + - Predation
Which of the following statement is correct?
(1) Two species within a given community can have exactly the same niche
(2) Two species within a given community cannot have exactly the same niche
(3) Two species can live permanently together
(4) both (2) & (3)
Organisms occupying similar ecological niche but different geographical areas of distribution are called
(1) Edge species
(2) Ecological equivalents
(3) Ecoclines
(4) Inquilines
Transition zone between two community is called
(1) Ecoline
(2) Ecotone
(3) Buffer zone
(4) Thermocline
Soil porosity is maximum in
(1) Sandy soil
(2) Clay soil
(3) Silt
(4) Loam
A process which maintains constancy of internal body environment of organisms despite varying external environmental conditions is called as
(1) Homeostasis
(2) Epistasis
(3) Heterosis
(4) Antibiosis
Which of the following type of age pyramid reflect a stable population growth?
(1) Triangular
(2) Bell-shaped
(3) Um-shaped
(4) Both bell-shaped and um-shaped
Change in population size equation with prolonged exponential phase can be converted into logistic growth equation by multiplying it with
(1)
(2)
(3)
(4)
Which one of the following population interactions is widely used in medical science for the production of antibiotics?
(1) Commensalism
(2) Mutualism
(3) Amensalism
(4) Parasitism
Asymptote in a logistic growth curve is obtained when
(1) The value of 'r' approaches zero
(2) K = N
(3) K > N
(4) K < N
When does the growth rate of a population following the logistic model equal zero? The logistic model is givenas dN/dt = rN(1 - N/K)
(1) when death rate is greater than birth rate
(2) When N/K is exactly one
(3) When N nears the carrying capacity of the habitat
(4) When N/K equals zero
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that
(1) Population A consumed the members of population B
(2) Both plant populations in this habitat decreased
(3) Population B completed more successfully for food than population A
(4) Population A produced more offspring than population B
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is
(1) Symbiosis
(2) Commensalism
(3) Amensalism
(4) Ectoparasitism
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is
(1) 15
(2) 05
(3) zero
(4) 10
What is true about the isolated small tribal populations?
(1) There is no change in population size as they have a large gene pool
(2) There is a decline in population as boys marry girls only form their own tribe
(3) Hereditary diseases like colour blindness do not spread in the isolated population
(4) Wrestlers who develop strong body muscles in their life time pass this character on to their progeny
The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?
(1) The population of its predators increases enormously
(2) S-shaped or sigmoid growth of this insect
(3) The food plants mature and die at the end of the rainy season
(4) Its population growth curve is of J-type.
Which one of the following pairs is mismatched?
(1) Savanna - Acacia trees
(2) Prairie - epiphytes
(3) Tundra - permafrost
(4) Coniferous forest - evergreen trees
Which of the following are likely to be present in deep sea water?
(1) Eubacteria
(2) Blue-green algae
(3) Saprophytic fungi
(4) Archaebacteria
A population growing in a habitat with limited resources shows four phases of growth in the following sequence
(1) Acceleration - deceleration - lag phase - asymptote
(2) Asymptote - acceleration - deceleration - lag phase
(3) Lag phase - acceleration - deceleration - asymptote
(4) Acceleration - lag phase - deceleration - asymptote
Two opposite forces operate in the growth and development of every population. One of them is related to the ability to reproduce at a given rate. The force opposite to it is called
(1) Fecundity
(2) Environmental resistance
(3) Biotic control
(4) Mortality
The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?
(1) Sigmoid
(2) Hyperbolic
(3) Ascending straight line
(4) J-shaped
Which type of associationis found in between entomophilous flower and pollinating agent ?
(1) Amensalism
(2) Commensalism
(3) Cooperation
(4) Co-evolution
What is a keystone species?
(1) A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival.
(2) A common species that has plenty of biomass, yet has a fairly low impact on the community's organization.
(3) A rare species that has minimal impact on the biomass and on other species in the community.
(4) A dominant species that consitutes a large proportion of the biomass and which affects many other species.
