CBSE Questions for Class 12 Medical Biology Organisms And Population Quiz 8 - MCQExams.com

Non-obligatory mutually beneficial relationship is represented by
  • Symbiosis
  • Protocooperation
  • Commensalism
  • Mimicry
In a population, rate of addition of new members is higher than the rate of individuals lost. It shows
  • Zero population growth
  • Declined growth
  • Exponential growth
  • None of these
Specialised pollinators are
  • Critical link species
  • Keystone species
  • Network species
  • Biospecies
A population with equal number of births and deaths will show
  • Acceleration phase of growth
  • Plateau phase
  • Exponential growth phase
  • Initial phase of growth
When the population reaches carrying capacity, which of the following equation can be related to it?
  • Mortality Rate=Birth Rate
  • Mortality Rate > Birth Rate
  • Mortality Rate < Birth Rate
  • None of the above
After exponential increase, population becomes stagnant . The growth curve is 
  • J-shaped
  • S-shaped
  • Fluctuating
  • Circular
Competition is the most severe between two ____________.
  • Closely related species growing in different niches
  • Closely related species growing in same niches
  • Distantly related species growing in same niches
  • Distantly related species growing in different niches
Competition is severe in a population that has distribution
  • Irregular
  • Uniform
  • Random
  • Nonrandom
Information about birth rate, death rate, sex ratio, age distribution, etc. of a population is obtained from
  • Mortality table
  • Life table
  • Natality table
  • Both A and C
Competition for light, nutrients and space is most severe between
  • Closely related organisms growing in different niches.
  • Closely related organisms growing in the same area/niches.
  • Distantly related organisms growing in same habitat.
  • Distantly related organisms growing in different habitat.
Zoochlorellae in Hydra produces an association known as
  • Symbiosis
  • Parasitism
  • Predation
  • Commensalism
Human population shows 
  • J-shaped growth curve
  • Z-shaped growth curve
  • S-shaped growth curve
  • All of the above
The phenomenon of one organism being benefited without affecting the other is  
  • Scavenging
  • Amensalism
  • Commensalism
  • Symbiosis
A bird introduced from another country became a serious pest due to the
  • Better adaptation to new area
  • More sexual reproduction
  • Better nesting habitats
  • Absence of natural competition
Which one is true ?
  • Commensalism when neither populations affect each other
  • Symbiosis when the interaction is useful to both the populations
  • Symbiosis when neither populations affects each other
  • Commensalism when the interaction is useful to both the populations
Permanent decrease in population would like due to 
  • Migration
  • Natality
  • Emigration
  • Mortality
  • Territoriality
The relation between algae and fungi in a lichen is
  • Symbiosis
  • Parasitism
  • Commensalism
  • Protocoperation
Remora-Shark relationship is
  • Symbiosis
  • Parasitism
  • Predation
  • Commensalism
Number of immigration is more than emigration and death is lower than natality. Growth curve of population will show
  • Exponential phase
  • Lag phase
  • Declining phase
  • Steady phase
In commensalism,
  • Both partners are benefitted.
  • Both partners are harmed.
  • Weaker is benefitted while stronger is unharmed.
  • None of the above.
Relationship between two organisms in which one obtains some benefits at the cost of other is
  • Parasitism
  • Predation
  • Symbiosis
  • Scavenging
  • Commensalism
Which of the following is wrong ?
  • Lichen, an association of fungus and alga, is an example of mutualism.
  • Epiphytes, using other plants for support only and not for water or food, show commensalism.
  • Sea Anemone and Hermit Crab association is an example of protocooperation.
  • Mutualism, protoco-operation and commensalism cannot be included under symbiosis.
Which of these take part in symbiosis of lichen?
  • Alga-Fungus
  • Alga-Alga
  • Fungus-Fungus
  • Fungus-Gymnosperm
Types of interaction that occur in predation and parasitism are 
  • + , +
  • - , -
  • + , 0
  • + , -
A successful parasite is the one which 
  • Grows rapidly
  • Reproduces fast
  • Sticks to host for long
  • Makes minimum demands from its host
Sigmoid curve is 
  • Rate of transpiration
  • Rate of respiration
  • Rate of photosynthesis
  • Growth of population
An example of mutualism is 
  • Riccia
  • Selaginella
  • Lichen
  • Spirogyra
Which of the following is not a characteristic of intestinal symbiosis?
  • Feeding on extra food of host
  • Providing vitamins to host
  • Anaerobic respiration
  • Aerobic respiration
Association between entomophilous flowers and pollinating agent is 
  • Commensalism
  • Coevolution
  • Mutualism
  • Cooperation
A matching pair is 
  • Shark and sucker fish-commensalism
  • Algae and Fungi in Lichens -Mutualism
  • Orchids growing on trees -Parasitism
  • Cuscuta (Dodder) growing on other flowering plants -Epiphytism
Rhizobium bacteria and root nodules of Pea have an association called
  • Predation
  • Parasitism
  • Symbiosis
  • Commensalism
  • Scavenging
Association between Barnacles and Whale /Limulus is 
  • Symbiosis
  • Commensalism
  • Parasitism
  • Predatorship
Two species competing exactly for same resources can not live in the same niche due to 
  • Allen's Law
  • Gause hypothesis
  • Doll's Rule
  • Weismann's theory
Phase of population growth having equal natality and mortality is
  • Lag phase
  • Plateau phase
  • Exponential phase
  • Log phase
  Column I  Column II
 (i) Mutualism (p) Beneficial to a, no effect for b
 (ii) Competition (q) Be neficial to both a and b
 (iii) Parasitism (r) Beneficial to a and inhibitory for b
 (iv) Predation (s) Beneficial to a and harmful for b
 (v) Commensalism (t) Harmful to both a and b
March the columns and choose the correct combination
  • i-t , ii-s, iii-p, iv-q, v-r
  • i-p, ii-r, iii-q, iv-t, v-s
  • i-q , ii-t , iii-s , iv-r , v-p
  • i-r , ii-p , iii-q , iv-s , v-t
  • i-s , ii-q , iii-t , iv-p , v-r
Increase in number of individuals in a population represents
  • Natality
  • Mortality
  • Density
  • Diversity
A rocky area, once bare, is now a green forest . The sequence of succession has 
  • Woody mosses,woody shrubs , mosses and lichens
  • Lichens , mosses ,woody shrubs and annual herbs
  • Mosses , lichens , annual herbs and woody shrubs
  • Lichens , mosses , herbs and woody shrubs
In a population the rate of addition of new members is more than the members lost. The population shows
  • Exponential growth
  • Fluctuating growth
  • Declining growth
  • Zero population growth
Population density of terrestrial organisms is measured in terms of individuals per _____________. 
  • Metre
  • $$Metre^2$$
  • $$Metre^3$$
  • $$Metre^4$$
Natality is 
  • Total number of individuals presents for unit area at a given time.
  • Increase in the number of individuals in a population under given environmental conditions.
  • Loss of individuals due to death in a population under given environmental conditions.
  • Movement of individuals into and out of population.
  • Each population has three different age groups.
Competition causes 
  • Symbiosis
  • Extinction
  • Mutation
  • Large number of niches
Stronger partner is benefited and weaker partner is damaged in
  • Commensalism
  • Predation
  • Allelopathy
  • Symbiosis
Exponential population growth is represented by 
  • dN/dt=rN
  • dt/dN=rN
  • dN/rN=dt
  • rN/dN=dt
Carrying capacity is determined by
  • Limiting resources
  • Mortality rate
  • Natality rate
  • Predation
Each environment can support a limited population depending upon its 
  • Biotic potential
  • Carrying capacity
  • Natality
  • Reproductive potential
Under non-limiting environmental conditions, there will be 
  • Maximum natality and minimum mortality
  • Minimum natality
  • Maximum natality
  • Both B and C
Small /suckerfish sticks to the bottom of shark to obtain food crumbs. The association is 
  • Antibiosis
  • Predation
  • Commensalism
  • Parasitism
Which ones are true about interdependence (a) one is benefited and other unaffected in mutualism (b) Both partners are benefited in commensalism (c) One kills and feeds on another in predation (d) Both partners are benefited in  symbiosis
  • a and b only
  • a and c only
  • b and c only
  • c and d only
  • b and d only
A population growing in a habitat with limited resources shows four growth phases in the following sequence. Which of the following sequence holds good for the given condition? 
  • Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Lag phase $$\rightarrow$$ Asymptote
  • Asymptote $$\rightarrow$$ Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Lag phase
  • Lag phase $$\rightarrow$$Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Asymptote
  • Acceleration $$\rightarrow$$ Lag phase $$\rightarrow$$ Deceleration $$\rightarrow$$ Asymptote
There are two ways of exploitation. One way is parasitism which is the other one
  • Antibodies
  • Competition
  • Predation
  • Commensalism
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