Pre Video Test - Organisms and PopulationsContact Number: 8527521718Pre Video Test - Organisms and PopulationsContact Number: 8527521718Symptoms of altitude sickness include all except
Shivering during cold is beneficial for mammals. It helps to
(1) Decrease body temperature.
(2) Increase body temperature.
(3) Decrease rate of metabolism.
(4) None of these
Many adaptations of an organism have evolved over a long duration of evolution and are______
(1) Genetically unstable.
(2) Genetically fixed.
(3) Genetically disadvantageous.
(4) Genetically extemporaneous.
The main reason behind building burrows in soil by burrowing animals is
(1) To escape from predators.
(2) To derive nutrition parts of plants from Underground.
(3) The mode of evolution chose burrows as a specific habitat.
(4) To hide and escape from the above ground heat.
Choose the odd one out with respect to structure formed in the different organisms during suspended phase.
(1) Bacteria - Thick-walled spores
(2) Higher plants - Seeds, vegetative propagules
(3) Zooplankton - Diapause state
(4) Ectothermic organism - Torpid state during favourable season.
Smaller animals tend to lose body heat very fast as compared to larger animals because they have
(1) Higher surface to volume ratio.
(2) Lower surface to volume ratio.
(3) Equal values of surface and volume.
(4) Very low BMR (basal metabolic rate).
Select the incorrect statement
(1) Organisms living in oceans, lakes and rivers do not face any water related problems.
(2) Productivity and distribution of plants is dependent on water.
(3) The levels of thermal tolerance of different species determine to a large extent their geographical distribution
(4) Foraging, reproductive and migratory activities of some animals are dependent on seasonal variations in light
Population size in any given habitat is also known as _______
(1) Population cluster
(2) Population explosion
(3) Population abundance
(4) Population density
A striking difference between immigration and emigration is _____
(1) Immigration considers total numbers of species in a given habitat, while emigration refers to a single species.
(2) Emigration considers total numbers of species in a given habitat, while immigration refers to a single species.
(3) Immigration considers total number of dominant species in a given habitat, while emigration refers to a single species.
(4) Immigration considers total number of species in a given habitat, while emigration refers to a dominant single species.
Study the following equation in context of population growth and choose the correct option
dN/dt=(B-D)×N
Substituting r in place of B-D then
dN/dt=rN
Here, r is known as _______
(1) Extrinsic rate of natural decrease.
(2) Intrinsic rate of natural decrease.
(3) Intrinsic rate of natural increase.
(4) Extrinsic rate of natural increase.
What four factors define population growth?
(1) Births, deaths, immigration, emigration
(2) Survivorship, age specific, mortality, fecundity, death rate
(3) Mark recapture, census, quadrate, sampling transects
(4) Age specific birth rate, metapopulation structure, quardrate, ecotone
Which of the following is true concerning exponential growth?
(1) No population can grow exponentially for long.
(2) Exponential growth slows down as the population reaches near its maximal size.
(3) Bacterial colonies have been observed to maintain exponential growth for over a month.
(4) Exponential growth is commonly observed in large, slow growing species such as humans and elephants.
Read the following statements and select the correct option with respect to population attributes.
a. Population density is necessarily measured in numbers.
b. Tiger census is often based on pug marks and fecal pellets.
c. Biomass is not a meaningful measure to known population size.
d. Size of a population for any species is not a static parameter.
1. a. and b. 2. a. and d.
3. c. and d. 4. b. and d.
Select the incorrect statement regarding different population attributes.
(1) Natural selection operates at population level.
(2) Size of the population tells a lot about its status in the habitat.
(3) In age pyramids, age distribution of male and females are shown in separate diagrams.
(4) Population is a group of individuals multiplying by sexual and asexual reproduction
A species whose distribution is restricted to a small geographical area because of the presence of a competitive superior species is found to expand its distributional range dramatically when the competing species is experimentally removed. This phenomenon is known as
(1) Competitive exclusion.
(2) Competitive release.
(3) Interference competition.
(4) Resource partitioning.
Find out the false statements
(1) Parasite that feeds on the external surface of the host organism are called ectoparasite.
(2) The life cycle of endoparasite are more complex because of their extreme specialisation
(3) Parasitism has evolved in so many taxonomic groups from plants to higher vertebrates.
(4) Endoparasites have greatly complex morphological and anatomical features along with high reproductive potential.
Find out the incorrect statement
(1) Under a particular set of selection pressure, organisms evolve towards the most efficient reproductive strategy.
(2) In ammensalisms, one species is harmed whereas other is not benefitted.
(3) Some species of insects and frogs are cryptically coloured (camouflaged) to avoid being detected easily by the predator.
(4) Biological control methods adopted in agricultural pest control are based on the ability of the prey to regulate predator population.
Through resource partitioning
(1) Two species can compete for the same prey
(2) Slight variation in niche allow closely related species to co-exist in the same habitat.
(3) Competitive exclusion results in the success of the superior species.
(4) Two species undergo character displacement that allows them to compete.
The association between clown fish and sea anemone is the same as between
(1) Egret and grazing cattle
(2) Cuckoo and crow
(3) Fig and wasp
(4) Cuscuta and hedge plant
For the defense against predators, butterflies become highly distasteful due to having certain chemical in their bodies. What is the source of the chemical?
(1) The butterflies have genes for synthesis of this chemical in its each and every cell.
(2) The butterfly acquires this chemical during its caterpillar stage by feeding on a poisonous plant.
(3) The chemical accumulates in the cells of butterfly when it feeds on another insect
(4) The butterfly secretes the chemical
Predation, parasitism and commensalism share a common characteristic, that is
(1) Both the interacting species are benefitted.
(2) Interacting species live closely together.
(3) One of the species is benefitted while other is harmed.
(4) Both the species belong to the same taxonomic group.
Which of the following is not correct?
(1) More recent studies do not support gross generalisations about competition as suggested in Gause’s competitive exclusion principle.
(2) More recent studies do not rule out the occurrence of interspecific competition in nature.
(3) More recent studies point out that species facing competition might evolve mechanisms that promote co-existence rather than exclusion.
(4) Gause’s competitive exclusion principle is effective when resources are in excess.
Choose the correct match
|
Type of Biome |
Mean Annual Rainfall (mm) |
Mean Annual Temperature (C) |
|
|
1 |
Tropical Rain Forest |
2000-3500 |
23-27 |
|
2 |
Temperate Needle Leaf Forest |
1000-2500 |
"6-15" |
|
3 |
Tropical deciduous forest |
900-1600 |
"6-20" |
|
4 |
Temperate Broad Leaf Forest |
400-900 |
0-10 |
Match the following columns and choose the correct option
Column-I Column-II
a. Eurythermal (i) 0.1-0.28 m
b. Hypersaline lagoons (ii) Organisms can tolerate and thrive in a wide range of temperature
c. Stenohaline (iii) > 100 ppt saltconcentration
d. UV–C (iv) Organisms are restricted to a narrow range of salinities
1. a(ii), b(iii), c(i), d(iv)
2. a(ii), b(iv), c(iii), d(i)
3. a(i), b(iv), c(iii), d(ii)
4. a(ii), b(iii), c(iv), d(i)
Read the following statements and choose the correct option
Statement 1:The success of mammals is largely due to their ability to maintain a constant body temperature.
Statement 2:Majority of the animals and nearly all plants cannot maintain a constant internal environment.
1. Only statement 1 is correct.
2. Only statement 2 is correct.
3. Both statements are correct.
4. Both statements are incorrect
State True (T) or False (F) for the following statements and select the correct option
a. Mammals from colder climates generally have larger ears and limbs to minimize the heat loss.
b. Experience of altitude sickness is due to low atmospheric pressure at high altitudes.
c. The size of a population for any species is not a static parameter.
d. Resources for growth for most of the animal population are finite and become limiting sooner
or later.
a b c d
1. T T T T
2. F T T T
3. F F F F
4. T F T F
If ‘N’ is the population density at time t, then its density at time ‘t+1’ will be
1.
2.
3.
4.
Choose the incorrect match regarding population interactions.
Species A Species B
1. Amensalism – –
2. Parasitism + –
3. Commensalism + 0
4. Mutualism + +
What is/are the correct explanation(s) for the species richness of the tropics?
1. Tropics had less evolutionary time for species diversification.
2. Tropics provide a relatively constant environment.
3. Tropics receive more solar energy which contributes to greater productivity.
4. Both 2. and 3. are correct.
In logistic growth pattern, the influence of environmental resistances over the biotic potential is denoted by
1. r N 2.
3. (b-d)×N 4. None