CBSE Questions for Class 12 Medical Biology Organisms And Population Quiz 14 - MCQExams.com

Indian state having highest population density is
  • Kerala
  • West Bengal
  • Maharashtra
  • Punjab
World population is increasing continuously due to
  • Increased food supply
  • Increased mortality
  • Industrialisation
  • Decreased infant mortality
During the last phase of growth curve of a population, the number of births and deaths is
  • Unequal with less deaths
  • Equal as was also in the middle phase
  • Equal as was not so in middle phase
  • Unequal with more deaths
At present, growth of human population is represented in
  • Lag phase
  • Exponential phase
  • Exponential phase almost terminating stationary phase
  • Stationary phase
Lowest infant mortality rate in India, is in which of the following state?
  • Uttar Pradesh
  • Madhya Pradesh
  • Rajasthan
  • Kerala
Rapid decline in population due to high mortality rate is
  • Population density
  • Population explosion
  • Population crash
  • All of the above
Information of birth rate, death rate, sex ratio, age distribution of a population can be obtained from
  • Natality table
  • Mortality table
  • Age-distribution table
  • Life table
Which one has mainly controlled human population density?
  • Industry
  • Natural resources
  • Climate
  • Communication
Which one of the following factors has contributed most in the rapid rise of human population in the present century?
  • Decrease in infant mortality
  • Polygamy
  • Decrease in birth rate
  • Increase in death rate
Number of births per 1000 is
  • Growth rate
  • Conception rate
  • Reproduction rate
  • Crude birth rate
The country with maximum population density
  • China
  • U.S.A
  • Japan
  • India
  • Monaco
Growth of population is due to 
  • Natality and emigration
  • Natality and immigration
  • Mortality and immigration
  • Mortality and emigration
Exponential growth is shown by
  • Unicellular forms
  • A cell in tissue culture
  • Embryo
  • Multicellular plants
Main factor in increasing the population is
  • Early marriage
  • Suitable and favourable environment
  • More reproductive capacity
  • Higher natality and lower mortality
After 17$$^{th}$$ century, human population is in which stage
  • Zero growth stage
  • Exponential growth stage
  • Sigmoid stage
  • Constant stage
The density of population can be calculated
  • $$D = \displaystyle\frac{N}{S}$$
  • $$D = \displaystyle\frac{S}{N}$$
  • $$D = \displaystyle\frac{S}{W} $$
  • $$D = \displaystyle\frac{W}{S} $$
Which of the following factors affect human life with increasing to population density?
  • Availability of food housing and health facilities
  • Urbanization
  • Education
  • None of the above
The capacity of the environment in which a species can get maximum nutrition is called as
  • Growth capacity
  • Population capacity
  • Carrying capacity
  • Death rate
The semilog of per minute growing bacteria is ploted against time. What will the shape of graph?
  • Sigmoid
  • Hyperbolic
  • Ascending straight line
  • Descending straight line
Exponential growth phase in human population started about
  • First century A.D
  • 1500 A.D
  • 1750 A.D
  • 1951 A.D
Which one of the following is a correct pair of certain organism and the kind of association?
  • Shark and sucker fish- Commensalism
  • Algae and fungi in lichens- Mutualism
  • Orchids growing on trees- Parasitism
  • Cattle egret and grazing cattle - Amensalism
Forest officer who initiated people's participation in forest management was
  • Banerjee
  • Basu
  • Bahuguna
  • Tripathi
An unrestricted reproductive capacity is called as
  • Birth rate
  • Biotic potential
  • Carrying capacity
  • Fertility
Bacterial growth is the division of bacteria into its daughter cells. When bacteria are grown in a culture, they initially adjust to new medium and then start dividing rapidly, consuming available food reservoir uninhibited. In sometime, the growth becomes limited,bacteria stop dividing and eventually die. Which of the following graphs best exhibits bacterial growth in the culture at an optimum temperature over a 24-hour period?
Insects constitute the largest animal group on earth. About 25-30% of the insect species are known to be herbivores. In spite of such huge herbivore pressure, globally, green plants have persisted. One possible reason for this persistence is 
  • Food preference of insects has tended to change with time.
  • Herbivore insects have become inefficient feeders of green plants.
  • Herbivore population has been kept in control by predators.
  • Decline in reproduction of herbivores with time.
Terrestrial ecosystem having the highest primary productivity is
  • Pond
  • Ocean
  • Desert
  • Forest
If population of a species is transferred to more suitable environment, then it will show 
  • Protection against enemies
  • More individuals would survive
  • Rate of reproduction increases
  • Unlimitied food would be available
Which ones are true about interdependence?
(a) One is benefitted and other unaffected in mutualism.
(b) Both partners are benefitted in commensalism.
(c) One kills and feeds on another in predation.
(d) Both partners are benefitted in symbiosis.
  • a and b only
  • a and c only
  • b and c only
  • c and d only
Competition causes
  • Symbiosis
  • Extinction
  • Mutation
  • Larger number of niches
The orchid plants, which are found growing on the trees, are
  • Parasites
  • Epiphytes
  • Saprophytes
  • Lithophytes
A matching pair is
  • Shark and sucker flsh- Commensalism
  • Algae and Fungi in lichens- Mutualism
  • Orchids growing on trees- Parasitism
  • Both A and B
Association between entomophilous flowers and pollinating agent is
  • Commensalism
  • Coevolution
  • Mutualism
  • Cooperation
Animals have innate ability to escape from predation. Select the incorrect example.
  • Colour change in Chameleon
  • Enlargement of body by swallowing air in Puffer fish
  • Poison fangs of snakes
  • Melanin in moths
Which of the following biomass has few trees, hot climate throughout the year and alternating wet and dry seasons?
  • Tundra
  • Savannah
  • Tropical rain forest
  • Temperate grassland

The carrying capacity of a population is determined by its

  • Population growth rate
  • Natality
  • Mortality
  • Limiting resources
Clinging roots are found in
  • Orchids
  • Trapa
  • Podostemon
  • Screwpine
A bacterium divides after every $$35$$ min. If a culture containing $$10^5$$ cells per ml is grown, then cell concentration per ml after $$175$$ min. will be
  • $$175\times 10^5$$
  • $$125\times 10^5$$
  • $$48\times 10^5$$
  • $$32\times 10^5$$
Which of the following is a total root parasite?
  • Cuscuta
  • Rafflesia
  • Santalum
  • Monotropa
Which one of the following is a matching pair of certain organism(s) and the kind of association?
  • Shark and sucker fish- Commensalism
  • Algae and fungi in lichens- Mutualism
  • Orchids growing on tree- Parasitism
  • Both A and B
A cuckoo laying eggs in the nest of other species of birds, is an example of
  • Adelphoparasitism
  • Brood parasitism
  • Ectoparasitism
  • Hyperparasitism
Predation and parasitism are which type of interactions?
  • (+, +)
  • (+, 0 )
  • ( - )
  • (+, -)

What was the population density of India according to $$2001?$$

  • $$124$$ persons $$/km^2$$
  • $$224$$ persons $$/km^2$$
  • $$324$$ persons $$/km^2$$
  • $$424$$ persons $$/km^2$$
Match the following with correct combination.
Column IColumn II
A.Cuscuta1.Saprophyte
B.Eichhornia2.Pneumatophore
C.Monotropa3.Insectivorous plant
D.Rhizophora4.Parasite
E.Utricularia5.Root pocket
  • A- 3, B- 1, C- 5, D- 4, E- 2
  • A- 2, B- 3, C- 1, D- 5, E- 4
  • A- 4, B- 3, C- 1, D- 5, E- 2
  • A- 4, B- 5, C- 1, D- 2, E- 3
Exponential growth occurs when there is
  • A great environmental resistance
  • No environmental resistance
  • No biotic potential
  • A fixed carrying capacity
Choose the wrong combinations among the following.
S. No.
Interaction
Species A
Species B
A
Mutualism
+
+
B
Commensalism
+
O
C
Parasitism
+
+
D
Competition
O
-

  • A, B
  • B, C
  • C, D
  • A, D
The population growth of a plant species can be influenced by which of the following factors?
I. Intraspecies competition
II. Predation
III. Nutrient availability
  • I only
  • II only
  • III only
  • I, II and III
  • II and III

Read the passage and answer the following questions:

The following graphs show the growth of two closely related species of paramecia, both when grown alone (Figure 1) and when grown together (Figure 2). Both species consume bacteria as their food source and reproduce by binary fission as often as several times a day.

Figure 1

Figure 2

The data in Figure 2 indicate that
  • P. aurelia is preying on P. caudata.
  • P. aurelia is a better competitor than P. caudata.
  • P. aurelia and P. caudata are in a symbiotic relationship.
  • P. aurelia is a parasite of P. caudata.
  • P. aurelia grew better when combined with P. caudata than it did when grown alone.
The population size of a species over time is shown in the graph. The difference in population size between time 2 and time 3 is depicted by

480427_41d2708c5dec488dac1c8b97b5b9a69b.png
  • Decline in populations of parasitic species
  • Decline in predator population size
  • Decline in interspecies competition
  • Decline in intraspecies competition
  • Decline in available food resources
The adaptation exhibited by plants inhabiting warm, dry environments is
I. Conversion of carbon dioxide to a four-carbon compound
II. Closure of stomata throughout the night
III. Photorespiration
  • I only
  • II only
  • I and II
  • II and III
  • I and III
Two organisms live in close association with each other such as one is benefited and the other is neither benefited nor harmed. Which of the following terms best describes this relationship?
  • Mutualism
  • Commensalism
  • Symbiosis
  • Parasitism
  • Predator-prey relationship
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Medical Biology Quiz Questions and Answers