CBSE Questions for Class 12 Medical Biology Organisms And Population Quiz 3 - MCQExams.com

Botanical generic name of bladderwort is
  • Drosera
  • Nepenthus
  • Utricularia
  • Dionaea
An obligate root parasite is
  • Rafflesia
  • Loranthus
  • Striga
  • Both A and C
A rootless aquatic plant in which a portion of leaf is modified to form a bladder for catching small aquatic animals is
  • Dionaea
  • Drosera
  • Utricularia
  • Nepenthus
Which is not an insectivorous plant?
  • Dionaea
  • Dischidia
  • Drosera
  • Pinguicula
Biotrophic nutrition is shown by
  • Humans
  • Saprophytic plants
  • Invertebrates
  • Insectivorous plants
Which one of the following is the largest root parasite?
  • Rafflesia
  • Monotropa
  • Arceuthobium
  • All of the above
Carrying capacity of a population is determined by
  • Limiting resources
  • Mortality rate
  • Natality rate
  • Predation
Population density of terrestrial organisms is measured in terms of individual per _________.
  • Metre$$^{3}$$
  • Metre$$^{4}$$
  • Metre$$^{2}$$
  • Metre
In Nepenthes, the pitcher is formed due to modification of
  • Leaf petiole
  • Leaf lamina
  • Tendril
  • Leaflet
The Process by which individuals are included into a population is known as
  • Immigration
  • Emigration
  • Migration
  • Both (a) and (b)
In some tribes, the population does not grow appreciably because of
  • Low facundity
  • High rate of infant mortality
  • Illiteracy
  • Limited food supply
Which of the following ecosystems would be most stable?
  • Man made forest
  • Fresh water lake
  • Saline lake
  • Natural forest
Growth curve in animals is a _________.
  • Delta curve
  • Alpha curve
  • Beta curve
  • Sigmoid curve
The formula for exponential population growth is
  • $$rN / dN=dt$$
  • $$dN / dt=rN$$
  • $$dt / dN=rN$$
  • $$dN / rN=dt$$
Human population growth is
  • Lag
  • Stationary
  • Exponential
  • None of these
The aggregate of process that determine the size and composition of any population
is called
  • Population dispersal
  • Population dynamics
  • Population explosion
  • Population density
When environmental conditions are favorable, then the population growth curve will be?
  • 'L' shaped
  • 'J' Shaped
  • 'S' Shaped
  • 'U' Shaped
If in a population, natality is balanced by mortality then there will be?
  • Decrease in population growth
  • Zero population growth
  • Increase in population growth
  • Over population
Which of the following is not a controlling factor of
population density
  • Psychological factor
  • Geographical factor
  • Socioeconomic factor
  • Demographic factor
Morphallaxis is reported in 
  • Porifers
  • Coelentrates and flatworms
  • Nemarteans and some ascidians
  • All the above
Number of death and birth in the last stage of plateau
growth curve of a population will be
  • Equal unlike of middle stage
  • Unequal with more deaths
  • Unequal with less deaths
  • Equal like of middle stage
High growth at the time of exponential phase of human
population growth curve is due to
  • High birth and death rates
  • High birth and low death rate
  • Low birth and high death rate
  • Low birth and death rates
Which of the following factors regulate human life with
reference to population density
  • Availability of blood, housing and health facilities
  • Urbanization
  • Climatic conditions
  • All the above
The carrying capacity of a population is determined by its
  • Birth rate
  • Death rate
  • Limiting resource
  • Reproductive status
Population density means
  • The number of human per unit area
  • The number of human in a unit area at a specific time
  • The concentration of human population at a place
  • None of above
Match the following with correct combination

Column I                         Column II

A Mutualism                   1 Tiger and deer
B Commensalism           2 Cuscuta on Cissus
C Parasitism                  3 Sucker fish and shark
D Predation                   4 Crab and sea anemone
  • (a) A - 1, B - 2, C - 3, D - 4
  • (b) A - 4, B - 3, C - 2, 0 - 1
  • (c) A - 1, B - 3, C - 2, D - 4
  • (d) A - 2, B - 3, C - 1, D - 4
  • (e)A - 4, B - 2, C - 3, D - 1
The population density is highest in
  • USA
  • India
  • China
  • Japan
Assertion : Predation is an interspecific interaction with a feeding strategy.

Reason :  Predation and their prey maintain fairly stable population through time and rarely one population become abundant or scarce.
  • If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and reason are false
  • If the assertion is false but reason is true
When both partners/components are affected negatively, the nature of interaction is
  • Commensalism
  • Predation
  • Competition
  • Amensalism
If the rate of addition of new members increases with respect
to the individual host of the same population, then the
graph obtained has
  • Declined growth
  • Exponential growth
  • Zero population growth
  • None of these
Assertion : Natality rate increases the population size and population density both.

Reason : Natality increases the number of individuals in an area by births.
  • If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  • If both the assertion and the reason are true but the reason is not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and the reason are false
  • If the assertion is false but reason is true
Assertion : Relationship between sea anemone and hermit crab is said to be an example of obligate mutualism.

Reason : Obligate mutualism is a positive (benefical) interaction between two species.
  • If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and reason are false
  • If the assertion is false but reason is true
Assertion : Allelopathy is a form of ammensalism that occurs in plants

Reason : Association of rooting plants with fungal hyphae, is an important example of ammensalism.
  • If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and reason are false
  • If the assertion is false but reason is true
Mycorrhiza, a relationship between fungi and roots of higher plants is
  • Parasitic relationship
  • Saprophytic relationship
  • Symbiotic relationship
  • Epiphytic relationship
A phenomenon when parasite parasitizes themselves is known as
  • Hyperparasitism
  • Parasitoids
  • Monoxenous parasitism
  • Polyxenous parasitism
Which of the following statements regarding species interdependence are true
A. An association of two species where one is benefited and other remains unaffected is called mutualism
B. An interspecific association where both partners derive benefit from each other is called commensalism
C. A direct food relation between two species of animals in which one animals kills and feeds on another is referred as predation
D. A relationship between two species of organism where both the partners are benefited from each other is called symbiosis
  • A and B only
  • C and D only
  • A and C only
  • B and C only
  • B and D only
An association of two species where both the partners derive mutual benefit from each other is
  • Parasitism
  • Symbiosis
  • Commensalism
  • Predation
The Orobanche plant is
  • Partial root parasite
  • Total root parasite
  • Symbiont
  • Total stern parasite
One who gets food and other things at the cost of other is called a
  • parasite
  • Commensal
  • Saprophyte
  • Insectivorous
Two organisms, are showing commensalism type of interaction. In such relationship
  • One is benefitted, and the other is neither harmed nor benefitted
  • Mutual beneficial for both the organisms
  • One organism in harmed and the other is not affected
  • One is benefitted and the other is harmed
Barnacles growing on the back of whale is an example for
  • Mutualism
  • Commensalism
  • Parasitism
  • Amensalism
  • Predation
Which of the following statements is incorrect
  • Lichen, an association of fungus and algae is an example of Mutualism
  • Those Epiphytes which use other plants for support only and not for water or food supply are examples of commensalism
  • Sea-anemone on hermit-crab is an example of protocooperation
  • Mutualism, noncooperation, commensalism cannot be included under Symbiosis
A high density of elephant population in an area can result in :-
  • Predation on one another
  • Mutualism
  • Intra specific competition
  • Inter specific competition
Large unit of land having different types of plants and

animals is known as
  • Uniform vegetation
  • Biome
  • Ecosystem
  • Niche
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is: 
  • Ectoparasitism
  • Amensalism
  • Commensalism
  • All of the above
A large regional unit characterized by a major vegetation type and associated fauna found in a specific climatic zone
constitutes
  • Ecosystem
  • Biological community
  • Biome
  • Habitat
Rhododendron is the characteristic vegetation of
  • Tropical zone
  • Alpine zone
  • Gangetic plains
  • Mangrove belt
Temperate evergreen forests are found in
  • Himalayan ranges
  • Western ghats
  • Aravalli ranges
  • Assam
Match the following and choose the correct combination
from the options given below
Column I
(Population
interaction)
Column II
(Examples)
A. Mutualism
Ticks on dogs
B.Commensalism
Balanus and Chathamalus
C. Parasitism
Sparrow and any seed
D. Competition
Epiphyte on a mango branch
E. Predation
Orchid Ophrys and bee
  • 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-4, B-3, C-2, D-1, E-5
  • A-5, B-4, C-1, D-2, E-3
Study the four statements (ad) given below and select the two correct ones out of them

(a) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
(b) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
(c) Predators ultimately lead to the extinction of prey species
(d) Production of chemicals such as nicotine,strychnine by the plants are metaboilic disorders

The two correct statement are-
  • a and d
  • a and b
  • b and c
  • c and d
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