NEET Biology Organisms and Populations MCQs Set 01

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

Question. Father of Indian ecology is
(a) R. Deo Mishra
(b) Hutchinson
(c) G. S. Puri
(d) H. Reiter

Answer: A

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: A

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: A

Question. Ecology is basically concerned with how many basic levels of organisation?
(a) Four
(b) Eight
(c) Two
(d) Three

Answer: A

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: A

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: A

Question. Permafrost condition is characteristic feature of
(a) Cold desert biome
(b) Savanna biome
(c) Chaparral biome
(d) Hot desert biome

Answer: A

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: A

Question. Choose odd one w.r.t., features of tropical rain forest
(a) Permafrost
(b) Drip tips
(c) Epiphytes
(d) Woody climber

Answer: A

Question. The organisms found in boiling thermal springs are
(a) Archaebacteria
(b) Actinomycetes
(c) Protists
(d) Fungi

Answer: A

Question. Which of the following is most ecologically relevant factor?
(a) Temperature
(b)   None of these
(c) Precipitation
(d) SoilWind

Answer: A

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: A

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: A

Question. Mango, tuna fish, snow leopards are
(a) Stenothermal
(b) Eurythermal & euryhaline
(c) Euryhaline
(d) Eurythermal

Answer: A

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: A

Question. Two most important factors influencing the life of organisms are
(a) Water, temperature
(b) Soil, temperature
(c) Light, water
(d) Soil, Light

Answer: A

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: A

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: A

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: A

Question. Natural selection operates at
(a) Population level
(b) Community level
(c) Ecosystem level
(d) Organismal level

Answer: A

Question. Find odd one w.r.t. population
(a) Births
(b) Age pyramid
(c) Death rate
(d) Natality

Answer: A

Question. Which of the following contributes an increase in population density?
(a) Natality
(b) Predation
(c) Emigration
(d) Mortality

Answer: A

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: A

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: A

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: A

Question. ‘Resource partitioning’ is an important mechanism which promotes
(a) Co-existence
(b) Antibiosis
(c) Competitive release
(d) Competitive exclusion

Answer: A

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

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: A

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: A

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: A

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: A

Question. The taiga region is also known as
(a) Northern conifer forest
(b) Deciduous forest
(c) Tropical rain forest
(d) Tropical savannah

Answer: A

Question. Read the following statements w.r.t. features of biomes and select the correct option for tropical rain forests
e. 30-40 m tall canopy structure with 2-3 strata only
(a) Buttress roots
(b) Vines, lianas and epiphytes are abundant
(c) Highly leached soils
(d) Soil has high base content
(a) a, b & c
(b) c, d & e
(c) b, c & d
(d) a, b & e

Answer: A

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: A

Question. Soil porosity is maximum in
(a) Clay soil
(b) Silt
(c) Loam
(d) Sandy soil

Answer: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A

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: A