NEET Biology Organisms and Populations MCQs Set A

Question:  A population is

• a) A group of organisms of one species occupying a defined area
• b) A group of organisms of different species occupying a defined area
• c) A group of organisms of different species occupying different geographical area
• d) A group of sexually isolated organisms occupying a defined area

Answer: A group of organisms of one species occupying a defined area

Question:  Which is the correct order of ecological hierarchy?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Father of Indian ecology is

• a) R. Deo Mishra
• b) Hutchinson
• c) G. S. Puri
• d) H. Reiter

Answer: R. Deo Mishra

Question: Ecology describes

• a) Interactions of organisms among themselves as well as with their surrounding abiotic components
• b) Intraspecific competitions only
• c) Interactions between members of a single species only
• d) Interactions between living organisms only

Answer: Interactions of organisms among themselves as well as with their surrounding abiotic components

Question: Members of a population

• a) More than one option is correct
• b) Share a common gene pool
• c) Can interbreed and produce fertile offsprings
• d) Share or compete for similar resources

Answer: More than one option is correct

Question: Ecology is basically concerned with how many basic levels of organisation?

• a) Four
• b) Eight
• c) Two
• d) Three

Answer: Four

Question: Ecological equivalents meant for

• a) Organisms that occupy similar ecological niche in different geographical locations
• b) Two similar ecological niche in two different geographical locations
• c) Two similar ecological niche in same geographical location
• d) Organisms that occupy different ecological niche in different geographical locations

Answer: Organisms that occupy similar ecological niche in different geographical locations

Question: Factors which play significant role in the formation of major biomes are

• a) Temperature and precipitation
• b) Precipitation and atmosphere
• c) Temperature only
• d) Precipitation and wind

Answer: Temperature and precipitation

Question: Permafrost condition is characteristic feature of

• a) Cold desert biome
• b) Savanna biome
• c) Chaparral biome
• d) Hot desert biome

Answer: Cold desert biome

Question: Find out incorrect match

• a) Topographic factors – Soil texture
• b) Climatic factors – Wind, humidity
• c) Edaphic factors – Soil factors
• d) Physiographic factors – Mountain slope

Answer:  Topographic factors – Soil texture

Question: Choose odd one w.r.t., features of tropical rain forest

• a) Permafrost
• b) Drip tips
• c) Epiphytes
• d) Woody climber

Answer: Permafrost

Question: The organisms found in boiling thermal springs are

• a) Archaebacteria
• b) Actinomycetes
• c) Protists
• d) Fungi

Answer: Archaebacteria

Question: Which of the following is most ecologically relevant factor?

• a) Temperature
• b)  None of these
• c) Precipitation
• d) SoilWind

Answer: Temperature

Question: A habitat is constituted by

• a) Abiotic and biotic factors
• b) Topographic, climatic and edaphic factors
• c) Climatic and edaphic factors
• d) Predators and pathogens

Answer:  Abiotic and biotic factors

Question: A kind of similarity found in polar regions and high altitudes is

• a) Low temperature, snowfall, scanty or no vegetation
• b) High temperature, low precipitation and deciduous forest
• c) Moderate rainfall, high temperature, no vegetation
• d) High humidity, high rainfall, low temperature

Answer: Low temperature, snowfall, scanty or no vegetation

Question: Mango, tuna fish, snow leopards are

• a) Stenothermal
• b) Eurythermal & euryhaline
• c) Euryhaline
• d) Eurythermal

Answer: Stenothermal

Question: Find out correct match w.r.t. salinity (in parts per thousand)

• a) Hyper saline logoons = >100
• b) In land water = >5
• c) Sea water = 60–65
• d) Fresh water = >3

Answer:  Hyper saline logoons = >100

Question:

• a) a(ii), b(iii), c(i)
• b) a(iii), b(i), c(ii)
• c) a(i), b(iii), c(ii)
• d) a(i), b(ii), c(iii)

Answer: a(ii), b(iii), c(i)

Question: Two most important factors influencing the life of organisms are

• a) Water, temperature
• b) Soil, temperature
• c) Light, water
• d) Soil, Light

Answer:  Water, temperature

Question:

• a) A-plants, B-birds
• b) A-birds, B-mammals
• c) C-mammals, B-plantsA-birds, B-plants
• d) A-birds, B-plants

Answer:  A-plants, B-birds

More Questions...........................................

Question: Smaller animals tend to lose body heat very fast as compared to larger animals because they have

• a) Higher surface to volume ratio
• b) Lower surface to volume ratio
• c) Equal values of surface and volume
• d) Very low BMR (basal metabolic rate)

Answer:  Higher surface to volume ratio

Question:

• a) a(ii), b(i), c(iii)
• b) a(iii), b(i), c(ii)
• c) a(i), b(iii), c(ii)
• d) a(i), b(ii), c(iii)

Answer: a(ii), b(i), c(iii)

Question: Thick cuticle, sunken and scotoactive stomata, CAM photosynthesis and conversion of leaves into spines are some of the important characters of

• a) More than one option is correct
• b) Hydrophytes
• c) Desert plants
• d) Xerophytes

Answer: More than one option is correct

Question: Warm blooded animals like mammals from colder climates generally have shorter ear and limbs. This is an explanation of

• a) Allen’s rule
• b) Rensch’s rule
• c) Bergman’s rule
• d) Jordan’s rule

Answer: Allen’s rule

Question: Natural selection operates at

• a) Population level
• b) Community level
• c) Ecosystem level
• d) Organismal level

Answer: Population level

Question: Find odd one w.r.t. population

• a) Births
• b) Age pyramid
• c) Death rate
• d) Natality

Answer: Births

Question: Which of the following contributes an increase in population density?

• a) Natality
• b) Predation
• c) Emigration
• d) Mortality

Answer: Natality

Question: Which of the following is considered as more realistic growth model?

• a) Logistic growth
• b) Exponential growth
• c)  Geometric growth
• d) Arithmetic growth

Answer: Logistic growth

Question: In nature, a given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible. This characteristic feature of nature is known as

• a) Carrying capacity
• b) Natural selection
• c)  Homeostasis
• d) Biotic potential

Answer: Carrying capacity

Question: Predators play important role in

• a) More than one option is correct
• b) Maintainance of species diversity
• c) Conduction of energy across trophic levels
• d) Control of prey population

Answer: More than one option is correct

Question: ‘Resource partitioning’ is an important mechanism which promotes

• a) Co-existence
• b) Antibiosis
• c) Competitive release
• d) Competitive exclusion

Answer:  Co-existence

Question:

a. Loss of unnecessary sense organs
b. Pressence of adhesive organs
c. Presence of suckers
d. High reproductive capacity
e. Well developed digestive system
Choose correct option w.r.t. parasites

• a) Only a, b, c, d are correct
• b) All a-e are correct
• c) Only a, b, d & e are correct
• d) Only d & e are incorrect

Answer: Only a, b, c, d are correct

Question:  Select the incorrect match

• a)

  

  

• b)

  

  

• c)

  

  

• d) None of these 

Answer:

Question: Camouflage is an important mechanism where

• a) Prey species are cryptically coloured to avoid being detected easily by the predator
• b) Predators are never cryptically coloured for easy capturing of their prey
• c) Prey produces some poisonous chemicals in their surroundings to protect themselves from predators
• d) Predators evolved some physiological adaptations to reach to the prey present in some harsh habitats

Answer: Prey species are cryptically coloured to avoid being detected easily by the predator

Question: A J-shaped growth curve depicts

• a) Exponential growth when conditions are unlimited
• b) Exponential growth when conditions are limited
• c) Logistic growth when conditions are limited
• d) Logistic growth when conditions are unlimited

Answer: Exponential growth when conditions are unlimited

Question: Which of the following statement is correct ?

• a) Both
• b) Two species within a given community cannot have exactly the same niche
• c) None of these
• d) Two species can live permanently together

Answer: Both

Question: Organisms occupying similar ecological niche but different geographical areas of distribution are called as

• a) Ecological equivalents
• b) nquilines
• c) Edge species
• d) Ecoclines

Answer: Ecological equivalents

Question: The taiga region is also known as

• a) Northern conifer forest
• b) Deciduous forest
• c) Tropical rain forest
• d) Tropical savannah

Answer: Northern conifer forest

Question: Read the following statements w.r.t. features of biomes and select the correct option for tropical rain forests

a. Buttress roots
b. Vines, lianas and epiphytes are abundant
c. Highly leached soils
d. Soil has high base content
e. 30-40 m tall canopy structure with 2-3 strata only

• a) a, b & c
• b) c, d & e
• c) b, c & d
• d) a, b & e

Answer: a, b & c

Question: A good soil is that which

• a) Has moderate water holding capacity
• b) Allows water to pass through it quickly
• c) Has very high water holding capacity
• d) Has very low water holding capacity

Answer:  Has moderate water holding capacity

Question: Soil porosity is maximum in

• a) Clay soil
• b) Silt
• c) Loam
• d) Sandy soil

Answer: Clay soil

Question: Rise in the temperature and air humidity can be observed from

• a) Poles to equator region during latitudinal transition
• b) Equator towards polar region
• c) Plains to mountain top during altitudinal movement
• d) More than one option is correct

Answer:  Poles to equator region during latitudinal transition

Question:

• a) a(ii), b(i), c(iii)
• b) a(ii), b(iii), c(i)
• c) a(i), b(iii), c(ii)
• d) a(i), b(ii), c(iii)

Answer: a(ii), b(i), c(iii)

Question: A process which maintains constancy of internal body environment of organisms despite varying external environmental conditions is called as

• a) Homeostasis
• b) Epistasis
• c) Heterosis
• d) Antibiosis

Answer: Homeostasis

Question: Nearly all plants and an overwhelming majority (99 percent) of animals are categorised as

• a) Conformers – They cannot maintain a constant internal environment
• b) Conformers – They can maintain a constant internal environment
• c) Regulators – They can maintain a constant internal environment
• d) Regulators – They cannot maintain a constant internal environment

Answer:  Conformers – They cannot maintain a constant internal environment

Question: Keolado national park is situated at ______ and is famous for ______.

• a) Bharatpur (Rajasthan), Siberian cranes
• b) Gir (Gujarat), Lion
• c) Ranthambhore (Rajasthan), Tiger
• d) Hazaribag (Jharkhand), Tiger

Answer: Bharatpur (Rajasthan), Siberian cranes

Question: Altitude sickness which includes nausea, fatigue and heart palpitations occurs due to

• a) Low atmospheric pressure at high altitude
• b) High mountain height and high temperature
• c) High atmospheric pressure at high altitudes
• d) Heavy snowfall at high altitude and low temperature

Answer:  Low atmospheric pressure at high altitude

Question: Consider the following statements (A - D) each with one or two blanks.

(A) Some snails go into _____(i)_____ to avoid ____(ii)_____ related problems.
(B) Since small animals have a ____(iii)___ surface area relative to their volume, they tend to lose body heat_____(iv)______ when it is cold outside.
(C) Next to temperature, _____(v)____ is the most ecologically important environmental factor.
(D) Every ____(vi)____ the famous Keolado National Park in Rajasthan host thousands of migrating birds.
Which one of the following option gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements?

• a) (iii) Larger, (iv) Very fast, (v) Water
• b) (i) Aestivation, (ii) Winter, (v) Light
• c) (i) Hibernation, (ii), Summer, (v) Light
• d) (iv) Very slow, (v) Water, (vi) Summer

Answer: (iii) Larger, (iv) Very fast, (v) Water

Question: Select the correct statement w.r.t adaptations

• a) Desert lizards bask in the sun and absorb heat when their body temperature drops below comfort zone
• b) To stop experiencing altitude sickness, the body compensates low oxygen availability by increasing binding affinity of haemoglobin
• c) Mammals of colder climate generally have larger ears and limbs to minimise heat loss
• d) Many desert plants have thin cuticle on their leaf surface and have their stomata arranged on upper surface to minimise water loss

Answer:  Desert lizards bask in the sun and absorb heat when their body temperature drops below comfort zone

Question: Select the incorrect statement w.r.t. ecotypes

• a) They are interfertile
• b) They are different from each other on the basis of morphological and physiological characters
• c) They are genetically similar
• d) There may be several ecotypes of the same organism

Answer: They are interfertile

Question: Altitude sickness is managed by the body by

• a) Decreasing binding capacity of hemoglobin
• b) Increasing fat oxidation
• c) Decreasing breathing rate
• d) Decreasing RBC production

Answer: Decreasing binding capacity of hemoglobin

Question: Select incorrect statement

• a) Organisms living in oceans, lakes and rivers do not face any water related problems
• b) Productivity and distribution of plants is dependent on water
• c) The levels of thermal tolerance of different species determine to a large extent their geographical distribution
• d) Foraging, reproductive and migratory activities of some animals are dependent on seasonal variation in light

Answer:  Organisms living in oceans, lakes and rivers do not face any water related problems

Question: A group of individuals living in a particular geographical area at a particular time is called

• a) Both
• b) Deme
• c) Local population
• d) None of these

Answer: Both

Question: Which is not true for J-shaped growth curve

• a) Population never grows beyond carrying capacity
• b) Exponential phase is prolonged
• c) Population crash occurs
• d) Population seldom reaches equilibrium

Answer: Population never grows beyond carrying capacity

Question: The interaction between two living organisms of different species which is beneficial to both but is not obligatory because they can live without each other is known as

• a) Proto-cooperation
• b) Commensalism
• c) Mutualism or symbiosis
• d) Amensalism

Answer: Proto-cooperation

Question: Competition for food, light and space is most severe between two

• a) Closely related species growing in the same area
• b) Closely related species growing in different habitat
• c) Distantly related species growing in the same habitat
• d) Distantly related species growing in different habitat

Answer: Closely related species growing in the same area

Question: Which of the following type of age pyramid reflects a stable population growth?

• a) Bell-shaped
• b) Both bell-shaped and urn-shaped
• c) Triangular
• d) Urn-shaped

Answer:  Bell-shaped

Question: Biotic potential is

• a) Intrinsic rate of natural increase under environmental unlimited condition
• b) Intrinsic rate of natural increase under environmental limited condition
• c) Extrinsic rate of natural increase under environmental limited conditions
• d) Extrinsic rate of natural increase under environmental unlimited conditions

Answer: Intrinsic rate of natural increase under environmental unlimited condition

Question: Cattle or goats are never browsing on Calotropis growing in abandoned fields because of the presence of

• a) Poisonous glycosides
• b) Opium
• c) Alkaloids like quinine
• d) Long chain fatty acids

Answer: Poisonous glycosides

Question: Pollination in Ophrys (a mediterranean orchid) occurs by

• a) Insect through pseudocopulation mechanism
• b) Insect through clip mechanism
• c) Insect through trap door mechanism
• d) Insect through lever mechanism

Answer: Insect through pseudocopulation mechanism