CBSE Questions for Class 12 Medical Biology Organisms And Population Quiz 9 - MCQExams.com

Which one is appropriately defined ?
  • Host is an organism which provides food another organism.
  • Amensalism is a relationship in which one species is benefitted while the other is unaffected.
  • Predator is an organism that catches and kills other organisms for food.
  • Parasite is an organisms which always lives inside the body other organisms and may kill it.
A phenomenon when parasite is dependent on another parasite is 
  • Hyperparasitism
  • Parasitoids
  • Monoxenous parasitism
  • Ployxenous parasitism
The most important factor which determined the increase in human population in India during 20$$^{th}$$ century has been 
  • Mortality
  • Immigration
  • Emigration
  • Natality
One species is harmed whereas the other is unaffected. Such type of interaction is called 
  • Commensalism
  • Amensalism
  • Parasitism
  • Predation
A symbiotic bacterium is
  • Nitrobacter
  • Nitrosococcus
  • Nitrocystis
  • Rhizobium
Rhizosphere microflora exhibits 
  • Symbiosis
  • Parasitism
  • Commensalism
  • Space parasitism
  I  II
 a Mutuatism p Ticks on dogs
 b Commenisalism q Balanus and Chihamalus
 c Parasitism r Sparrow and any seed
 d Competitions  Orchid epiphyoe on Mango branch 
 e Predation t Ophrys and bee
Match the columns and choose the correct options 
  • a - t , b - s ,c - p ,d - q , e - r
  • a - q , b - p ,c - t ,d - s, e - r
  • a - r , b - q ,c - p ,d - t , c - s
  • a - s , b - r ,c - q ,d - p , e - t
Gause law is related to 
  • Predation
  • Parasitism
  • Competitive exclusion
  • Coexistance
Which of the following processes will be most adversely affected if microorganisms are removed from forest ecosystem?
  • Solar energy fixation and nutrient cycling
  • Decomposition of organic matter and photosynthesis
  • Nitrogen fixation and decomposition of organic matter
  • Carbon assimilation and nitrogen fixation
Which statement is false about predators ?
  • Predators keep prey population under control
  • Predators help in maintaining species diversity in a community
  • If a predator is not efficient, the prey population will become extinct
  • Tiger is an example of predator
Browsing of animals is an example of 
  • Commensalism
  • Predation
  • Parasitism
  • Amensalism
Which is correctly labelled 
697443_6930de30944044ecb7b21b48774e59c0.png
  • B-logistic curve
  • C-carrying capacity
  • C-exponential curve
  • A-carrying capacity
Identify the facultative parasite from below 
  • Enterobius vermicularis
  • Mycobacterium tuberculosis
  • Taenia solium
  • Trichomonas hominis
Which one is parasite in true sense?
  • Head lice living on human scalp as well as laying eggs on human hair
  • Cuckoo laying eggs in Crow's nest
  • Female Anopheles biting and sucking blood from humans
  • Human foetus inside uterus and drawing nourishment from mother
Which one has maximum biomass?
  • Pond ecosystem
  • Lake ecosystem
  • Glassland ecosystem
  • Forest ecosystem
Grazing benefits the grasses. The term for this interaction should be 
  • Commensalism
  • Predation
  • Mutualism
  • Amensalism
Carrying capacity of an environment for a given population is
  • $$\dfrac{dN}{dt}=rN(1-\dfrac{N}{K})$$
  • $$dN=rN-\dfrac{N}{K}$$
  • $$\dfrac{dN}{dt}=rN-\dfrac{N}{K}$$
  • $$\dfrac{dN}{dt}=rN-\dfrac{1}{k}$$
What do a , b and c represent in the diagram?
696721_4ccfc938b18f4ec68f5cb3d972e880bf.png
  • Stationary, log and lag
  • Lag, stationary and log
  • Log, lag and stationary
  • Lag, log and stationary
If two species compete for the same resource and avoid competition by choosing different times for feeding or different forage pattern, it is
  • Resource partition
  • Competitive release
  • Mutualism
  • Commensalism
Which of the following interactions is /are examples of competition

I. Balanus and Cathamalus
II. Farm of rice paddies with weeds growing in the field
III. Monarch butterfly and birds
IV. Ophrys and wasp
  • I and III
  • I and II
  • I , II , and III
  • II , III and IV
  • IV only
The two basic processes which contribute to a decrease in population density are 
  • Natality and emigration
  • Mortality and immigration
  • Natality and immigration
  • Mortality and emigration
  • Emigration and immigration
An orchid growing as an epiphyte on a mango tree is an example of
  • Parasitism
  • Predation
  • Commensalism
  • Mutualism
  • Competition
  I  II
 (a) Mutualism (1) Ticks on dogs
 (b) Commensalism (2) Balance and Chathamalus
 (c) Parasitism (3) Sparrow and any seed
 (d) Competition (4) Epiphyte on a mango branch
 (e) Predation (5)  Ophrys and bees
Match the columns and choose the correct combination 
  • a - 1 , b - 5 , c - 4 , d - 3 , e - 2
  • a - 2 , b - 1 , c - 5 , d - 4 , e - 3
  • a - 3, b - 2 , c - 1 , d - 5 , e - 4
  • a - 5 , b - 4 , c - 1 , d - 2 , e - 3
  I IIIII 
 (I) Crab Sacculina Interaction ++
 (II) Human Being Mosquito Interaction -+
 (II) Sea Anemone Hermit Crab Interaction +O
Find the incorrect match
  • i only
  • ii and iii
  • iii and i
  • ii only
To which of the following interactions both partners adversely affected ?
  • Competition
  • Predation
  • Parasitism
  • Mutualism
Which one is not a parasitic adaptation?
  • Loss of digestive organs
  • Loss of reproductive capacity
  • Loss of unnecessary sense organs
  • Development of adhesive organs
A cuckoo laying eggs in the nest of other species of birds is an example of 
  • Adelphoparasitism
  • Brood parasitism
  • Ecotoparasitism
  • Hyper-parasitism
Number of individuals of a population who left habitat and gone elsewhere constitute
  • Natality
  • Mortality
  • Emigration
  • Immigration
Connel's field experiment  on rocky seacoast of Scotland , where larger barnacles (Balanus ) dominate the intertidal area and remove the smaller barnales (Cathamalus). This happens due to
  • Predation
  • Competition
  • Parasitism
  • Mutualism
All the following interactions are mutualism , except
  • Association of algae and fungi in lichens
  • Association on fungi and roots of higher plants in mycorrhiza
  • Plant and animal relation for pollination
  • Association of cattle's egret and grazing cattile
Abingation tortoise in Galapagos islands became extinct after goats with great browsing efficiency were introduced . In is an example of
  • Competitive release
  • Co-existence
  • Interferance competition
  • Competitive exclusion
With reference to competitive exclusion, which one of the following became extinct when browsing goats were introduced in Galapagos islands?
  • Abingdon tortoise
  • Warblers
  • Darwin's finches
  • Cathamalus
Commensalism is a symbiotic relationship between two organisms where
  • Both partners benefit
  • One partner benefit and causes harm to other
  • One partner benefits and the other receives no harm
  • Both partners are disadvantaged
Association that includes herbivores and phytophagous 
  • Competition
  • Parasitism
  • Predation
  • Commensalism
  • Mutualism
A decline in population size will be in simulation, when
  • Natality < Mortality
  • Mortallity < Natality
  • Immigration < Emigration
  • Emigration < Immigration
In which of the following, parasitic castration is observed ?
  • Carcinus maenus
  • African antelope
  • Anopheles
  • Culex
Choose the wrong combination
(a) Mutualism - + +
(b) Commensalism - + 0
(c) Parasitism - ++
(d) Competition - 0 - 
  • a , b
  • b , c
  • c , d
  • a , d
In which of the following type of interaction, both the interacting organisms do not live close together?
  • Predation
  • Parasitism
  • Mutualism
  • Competition
Match List I(Parasites) with List II(Type) and select the correct answer using the codes given the lists.
List-I(Parasites)List-II(Type)
a. Cascuta sp.$$1$$. Total root parasite
b. Loranthus sp.$$2$$. Partial root parasite
c. Orabanche sp.$$3$$. Total stem parasite
d. Santalum sp.$$4$$. Partial stem parasite
  • A-$$2$$, B-$$4$$, C-$$1$$, D-$$3$$
  • A-$$2$$, B-$$1$$, C-$$4$$, D-$$3$$
  • A-$$3$$, B-$$4$$, C-$$1$$, D-$$2$$
  • A-$$3$$, B-$$1$$, C-$$4$$, D-$$2$$
Which relationship is beneficial to both interacting organisms but is not obligatory?  
  • Commensalism
  • Protocooperation
  • Mutualism
  • Both B and C
The number of individuals of the same species that have come home from elsewhere during the time period under consideration is known as 
  • Emigration
  • Mortality
  • Natality
  • Immigration
  • Adaptation
Gause's principle of competitive exclusion states that
  • Larger organisms exclude smaller ones through competition.
  • More abundant species will exclude the less abundant species through competition.
  • Competition for the same resources excluding species having different food preferences.
  • No two species can occupy the same niche indefinitely for the same limiting resource.
The principle of competitive exclusion was enunciated by
  • Verhulst and Pearl
  • C.Darwin
  • G.F. Gause
  • Mac Arthur
Principle of competitive exclusion was given by
  • Gause
  • Hardin
  • Jaeger
  • Muller
A major cause of mortality of many birds visitors of aquatic habitat is
  • Nutrient enrichment
  • Lead poisoning
  • Salt enrichment
  • All the above
  I  II
 (i) Competition  (a) Tapeworm and man 
 (ii) Commercialism (b) Lichen
 (iii) Mutualism (c) Cattle regret and cattle
 (iv) Parasitism (d) Lions and leopards
Select the correct match
 
  • i - d , ii - c , iii - b , iv - a
  • i - d , ii - b , iii - c , iv - a
  • i - c , ii - b , iii - d , iv - a
  • i - a , ii - b , iii - d , iv - c
The interaction observed in this diagram is 
697513_f53fe3c0daee4fa59dc68486a968f861.png
  • Commensalism
  • Competition
  • Mutualism
  • Predation
If (+) sign is assigned to beneficial interaction (-) sign to detrimental and (0) to neutral interaction, then population interaction represented by (+) (-) refers to 
  • Parasitism
  • Mutualism
  • Amensalism
  • Commensalism
For which of the following cases, population density can be easily determined by utilizing non-biological parameter?
  • Fish density
  • Density of bacteria in culture plate
  • Siberian cranes at Bharatpur wetlands
  • Tiger census
Consider the following table.
Table of statistics.
Oven the biomass yields of three different components of four tree species ($$5$$-year old). (tonnes per hectare) Tree Name Stem Branch Leaf Total(tonne/hectare).
a. Eucalyptus $$25$$ $$15$$ $$10$$ $$50$$
b. Leucaena $$2$$ $$13$$ $$5$$ $$40$$
c. Acacia $$20$$ $$7.5$$ $$2.5$$ $$30$$
d. Casuarina $$15$$ $$3.5$$ $$1.5$$ $$20$$
Which one of these trees has produced the highest percentage of stem biomass?
  • Casuarina
  • Acacia
  • Leucaena
  • Eucalyptus
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