CBSE Questions for Class 12 Medical Biology Organisms And Population Quiz 6 - MCQExams.com

When a bird consumes insect pests from a rhino's back, what is the relationship between bird and rhino?
  • Mutualism
  • Parasitism
  • Saprophytism
  • Commensalism
  • Autotrophism
Which of the following pairs do not show parasitism?
  • Bird and rhinoceros
  • Virus and host cell
  • Tapeworm and human
  • Tuberculosis bacteria and human
  • Flukes and fish
What type of interaction is shown by a tapeworm residing in human intestine?
  • Predation
  • Commensalism
  • Interspecific competition
  • Mutualism
  • Parasitism
What type of interaction is shown by an algae growing on the shell of a turtle without harming it?
  • Predation
  • Commensalism
  • Interspecific competition
  • Mutualism
  • Parasitism
A relationship in which one organism is benefited while other is neither benefited nor harmed is known as
  • Commensalism
  • Mutualism
  • Parasitism
  • Symbiosis
Microorganism found in a termite's gut for cellulose digestion is best exemplified by
  • Mutualism
  • Parasitism
  • Saprophytism
  • Commensalism
  • Autotrophism
Which kind of interaction exists between hermit crab and sea anemone in which hermit crab provides for the movement of sea anemone while crab is protected from predators.
  • Parasitism
  • Predation
  • Mutualism
  • Commensalism
  • Competition
A close, long term association between two or more organisms is known as
  • Commensalism
  • Mutualism
  • Parasitism
  • Symbiosis
A relationship in which both the organisms are benefited is known as
  • Commensalism
  • Mutualism
  • Parasitism
  • Symbiosis
A scientist grew her bacterial colonies in a variety of different concentration of nutrient to determine the concentration at which they grow best. The results of her experiments are summarized in the following bar graph.
On the basis of the information depicted in the figure, the optimum concentration of nutrient supplement is
485629.png
  • 10 U/mL
  • 20 U/mL
  • 30 U/mL
  • 40 U/mL
  • 50 U/mL
This is a typical food web in a pond.
................. in this food web are in direct competition.

486889.PNG
  • Bass and minnows
  • Minnows and sunfish
  • Frogs and sunfish
  • Bass and algae
  • Frogs and algae
What is true about panting (a means of cooling used by many animals)?
  • Rapidly increase carbon dioxide expiration
  • Moisten the mucosa of the respiratory passages
  • Decrease body heat via evaporation
  • None of the above
A type of relationship in which one organism is benefited while other is harmed is called as
  • Commensalism
  • Mutualism
  • Parasitism
  • Symbiosis
What is mycorrhizae?
  • Plants that have no vascular tissue
  • Nitrogen-fixing bacteria that live in nodules on the roots of legumes
  • Primitive plants like mosses, which show a dominant gametophyte stage
  • Vascular bundles in the stems of tracheophytes
  • Symbiotic structures living in the roots of plants that increase uptake of nutrients from the soil
Which of the following shows that predators are beneficial to communities?
  • They control the prey population growth
  • They practice predation harvest
  • Predators enhance species diversity
  • Both A and B
  • All of the above
What type of interaction takes place between two animals fighting over same food?
  • Mutualism
  • Competition
  • Commensalism
  • Parasitism
  • Predation
What type of curve is shown by the graph?
490975_73473baf07a54310a7432a4f9d538f3d.png
  • Biotic potential curve
  • Carrying capacity
  • Density-dependent curve
  • Density-independent curve
  • Sigmoid curve
Which of the following explains, two dogs fighting for one bone?
  • Exploitative and interspecific competition
  • Interference and intraspecific competition
  • Exploitative and intraspecific competition
  • Exploitative and interference competition
  • Interference and interspecific competition
A population of aphids feed on the leaves of a host plant that produces a toxin. Within a time span, some aphids become immune to the toxin. The host  plant produces another toxin that is lethal to aphids. Such kind of association is known as
  • Parasitism
  • Commensalism
  • Predation
  • Mutualism
  • Coevolution
Which of the following best represents the human population, from stone age times to the present?
  • An exponential growth curve
  • A logistic growth curve
  • A bimodel distribution curve
  • A normal distribution curve
  • A random growth curve
Competition between members of a prairie dog population could be expected to increase as a result of an increase in the
  • Prairie dog intrinsic reproductive rate
  • Spread of disease among the prairie dogs
  • Mortality rate of prairie dogs
  • Natality rate of prairie dog predators
  • Number of secondary consumers
Which of the following is the advantage of social dominance hierarchies?
I. keep lowers on the pecking order from being abused.
II. Reduce interference competition.
III. keep organisms that are closely related closer together.
  • I is true.
  • II is true.
  • III is true.
  • I and II are both true.
  • I and III are both true.
The role of predators in an ecosystem is
  • Help the community by keeping the number of prey from outstripping their resources
  • Help the prey population by removing the sick and less fit individuals
  • Enhance species diversity
  • Reduce the possibility of competitive exclusion
  • All of the above
Even, clumped or random represents which property of the population?
  • Habitat
  • Dispersion
  • Size
  • Density
  • Growth rate
An example of exploitative competition is
  • A woodpecker and a wren
  • A sturgeon and a minnow
  • A mouse and a mole
  • A lichen and a rock
  • Mistletoe and a tree
The competitive exclusion principle can be best explained when
  • Predators exert a cyclic effect on the population size of their prey.
  • Two populations in the same ecosystem cannot occupy the same niche.
  • Pollutants accumulate in greater concentrations at higher trophic levels.
  • The trophic structure of ecosystems describes energy flow through a community.
  • An ecosystem has limited resources and cannot support an unlimited population.
Due to the increased average global temperature on fish populations, the fish will show
I. Movement from saline to fresh waters
II. Movement to deeper waters
III. Movement to higher latitudes
  • I only
  • II only
  • III only
  • I and II
  • II and III
According to the given graph, the size of the population reaches the carrying capacity for the ecosystem at time point 
497802.jpg
  • 3
  • 4
  • 6
  • 9
  • 12
The number of people that can be supported by the environmental resources without the degradation of environment is known as
  • Carrying capacity
  • Population density
  • Limiting factor
  • $$K$$-selection
  • $$r$$-selection
The population growth in the graph is best described by
497333.jpg
  • On day 1, the resources of the population limit its growth
  • On day 2, the birthrate per individual is greater than on day 1
  • On day 3, the population size is equal to K
  • On day 4, the curve is most similar an exponential growth curve
  • On day 5, the number of deaths approaches the number of births
The growth pattern demonstrated by population at time 1 is
497628.jpg
  • Gradual
  • Declining
  • Continual
  • Oscillating
  • Exponential
In which of these relationships one species harms the other species?
I. Commensalism
II. Predation
III. Herbivory
  • I only
  • III only
  • I and II
  • II and III
  • I, II, and III
Interspecific resource competition is shown by
  • Hare and rat
  • Rat and beetle
  • Hawk and tree
  • Deer and hare
  • Hawk and hare
All interactions show a kind of relationship between two organisms in which one is benefited at the expense of other except
  • Competition
  • Herbivory
  • Predation
  • Parasitism
  • Commensalism
In an experiment, E. coli bacteria are spread uniformly throughout the agar petri dish. The dish was then incubated at $$37^o$$C for $$24$$ hours.

On the completion of the experiment, most likely distribution of bacterial colonies represented by dots is shown by 
497925.png
A herd of cattle was moved by a rancher to a different pasture. The carrying capacity of that pasteur exceeded is known by the fact that
  • The herd increased in size
  • The pasture became overgrazed and barren
  • The pasture had more grasses
  • The cows gained weight
  • The cows had more calves
Which of the following does not cause a large number of density dependent deaths in a population?
  • Winter storms disease carrying insects
  • Disease carrying insects
  • Predators
  • Limited resources
  • Small forest fire
I. Temperature
II. Humidity
III. Vegetation 
The abiotic factors of ecosystem include
  • I only
  • II only
  • III only
  • I and II only
  • I, II and III
Population growth in an aquatic ecosystem can be limited by
  • Depth
  • Competition
  • Light penetration
  • Nutrient availability
  • Dissolved oxygen level
The least precipitation in Taiyuan, China is seen in the month of 
497834.jpg
  • April
  • December
  • February
  • January
  • July
What type of interaction takes place between a lion and haeyna fighting over a dead zebra?
  • Mutualism
  • Competition
  • Commensalism
  • Parasitism
  • Predation
Adventure world and Fun Park are 30 miles apart. Both amusement parks have thriving pigeon populations. People drop food throughout both parks, providing the main food source for the pigeons.
Adventure world has the more exciting rides and Fun Park is forced to close when it is unable to bring in enough people to cover operating costs. Upon closing, wildlife from the surrounding areas begins to take over.
In terms of evolutionary change, what is likely to happen to the two pigeon populations in the future?
  • Both populations are likely to remain fairly constant
  • Both populations will change at the same rate
  • The adventure world population will change more significantly than the fun park population
  • The fun park population will change more significantly than the adventure world population
Using lady beetles to prey upon aphids and mealy bugs is an example of 
  • Resource allocation
  • A biological control method
  • A biological magnification method
  • An increased use of insecticides
  • The benefits of invasive species
Various relationships exist between the species of a community. Identify the relationship between the species of a community described.
Flowers provide insects with nectar and pollen for food and insects help flowers to reproduce 
  • Mutualism
  • Commensalism
  • Predation
  • Competition
  • Parasitism
Various relationships exist between the species of a community. Identify the relationship between the species of a community described.
Barnacles attach to a whale's skin. The moving water carries food particles to the barnacles while the whale is neither harmed nor helped.
  • Mutualism
  • Commensalism
  • Predation
  • Competition
  • Parasitism
A red-tailed hawk hunts, kills and eats a squirrel. What role does the squirrel play in this interaction? 
  • Producer
  • Predator
  • Host
  • Scavenger
  • Prey
Which of these best describes population density? 
  • Carrying capacity
  • Rapid increase in the number of individuals in an area
  • Demography
  • Number of different populations in a community
  • Number of individuals per unit area
Which are density-dependent factors that limit population size?
 I. Disease
 II. Space
 III. Earthquake
  • I only
  • II only
  • III only
  • I and II only
  • II and III only
The population size that an environment can sustain is called the 
  • Maximum population
  • Habitat
  • Exponential limit 
  • Logistic goal
  • Carrying capacity
All the following interaction are mutualism, except
  • Association of algae and fungi in lichens.
  • Association of fungi and roots of higher plants in mycorrhiza.
  • Plant and animal relation for pollination.
  • Association of cattle egret and grazing cattle.
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