1The study of the relationship between a single insect species and its environment is known as:
A.Synecology
B.Autoecology
C.Demecology
D.Biome ecology
Correct Answer: Autoecology
Explanation:Autoecology is the study of the ecology of individual species or populations in relation to their environment, whereas synecology studies communities.
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2Which component of the insect environment includes temperature, humidity, light, and wind?
A.Biotic factors
B.Edaphic factors
C.Abiotic factors
D.Nutritional factors
Correct Answer: Abiotic factors
Explanation:Abiotic factors are non-living physical and chemical elements in the ecosystem, such as temperature, humidity, light, and soil conditions.
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3Insects are primarily organisms whose body temperature varies with the environmental temperature. This condition is called:
A.Homeothermic
B.Poikilothermic
C.Endothermic
D.Isothermic
Correct Answer: Poikilothermic
Explanation:Insects are poikilothermic (or ectothermic), meaning they cannot regulate their internal body temperature effectively and rely on external heat sources.
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4The specific physical place where an insect lives is called its:
A.Niche
B.Habitat
C.Trophic level
D.Biome
Correct Answer: Habitat
Explanation:A habitat is the physical location where an organism lives, while a niche refers to its functional role within that ecosystem.
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5Which term describes a state of arrested development in insects, often triggered by photoperiod, to survive unfavorable environmental conditions?
A.Quiescence
B.Diapause
C.Metamorphosis
D.Ecdysis
Correct Answer: Diapause
Explanation:Diapause is a physiological state of dormancy with very specific initiating and inhibiting factors, unlike quiescence which is a direct response to immediate adverse conditions.
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6The mathematical representation of the thermal constant for insect development is given by the formula . What does '' represent?
A.Maximum lethal temperature
B.Developmental period in days
C.Threshold temperature (Developmental zero)
D.Average daily temperature
Correct Answer: Threshold temperature (Developmental zero)
Explanation:In the formula, represents the threshold temperature or developmental zero, below which no development occurs.
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7Insects that are active during the twilight hours (dawn and dusk) are classified as:
A.Diurnal
B.Nocturnal
C.Crepuscular
D.Matinal
Correct Answer: Crepuscular
Explanation:Crepuscular insects are active primarily during twilight (dawn and dusk). Diurnal are active during the day, and nocturnal during the night.
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8The relative humidity zone in which most insects thrive is typically:
A.10-20%
B.40-80%
C.90-100%
D.0-10%
Correct Answer: 40-80%
Explanation:Most agricultural insects prefer a relative humidity range of 40-80%. Extremes outside this range can lead to desiccation or fungal infections.
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9Summer dormancy in insects to avoid high temperatures and desiccation is known as:
A.Hibernation
B.Aestivation
C.Vernalization
D.Acclimatization
Correct Answer: Aestivation
Explanation:Aestivation is the state of dormancy undertaken by animals during hot or dry periods (summer), whereas hibernation occurs during winter.
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10Which category of pests has a General Equilibrium Position (GEP) that is consistently above the Economic Injury Level (EIL)?
A.Occasional pest
B.Key pest
C.Sporadic pest
D.Seasonal pest
Correct Answer: Key pest
Explanation:Key pests are severe pests where the population density (GEP) is always above the EIL, requiring repeated intervention.
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11The population density at which control measures should be initiated to prevent an increasing pest population from reaching the Economic Injury Level is called:
A.General Equilibrium Position (GEP)
B.Economic Threshold Level (ETL)
C.Damage Boundary (DB)
D.Maximum Carrying Capacity
Correct Answer: Economic Threshold Level (ETL)
Explanation:The Economic Threshold Level (ETL) is the density at which action must be taken to prevent the pest from reaching the Economic Injury Level (EIL).
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12What is the primary ecological role of 'parasitoids' in insect ecology?
A.They consume dead organic matter.
B.They live on a host without killing it.
C.They develop inside or on a host and eventually kill it.
D.They compete with the host for food.
Correct Answer: They develop inside or on a host and eventually kill it.
Explanation:Unlike true parasites, parasitoids ultimately kill their host to complete their development.
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13Which of the following is an example of a density-independent factor affecting insect populations?
A.Predation
B.Disease
C.Competition
D.Rainfall
Correct Answer: Rainfall
Explanation:Rainfall is a density-independent abiotic factor because its occurrence and intensity do not depend on the size of the insect population.
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14The response of insects to the length of daylight and darkness is termed:
A.Phototaxis
B.Photoperiodism
C.Photonasty
D.Photosynthesis
Correct Answer: Photoperiodism
Explanation:Photoperiodism is the physiological reaction of organisms to the length of day or night, often regulating diapause and reproduction.
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15A pest that occurs in a specific season every year is termed a:
A.Sporadic pest
B.Seasonal pest
C.Persistent pest
D.Endemic pest
Correct Answer: Seasonal pest
Explanation:Seasonal pests occur during a specific season every year (e.g., Red Hairy Caterpillar during the monsoon).
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16Which law states that 'No two species can occupy the exact same niche in the same habitat at the same time'?
Explanation:Gause’s Competitive Exclusion Principle states that two species competing for the same limiting resources cannot coexist at constant population values.
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17Which of the following is a biotic factor that limits insect populations?
A.Temperature
B.Soil texture
C.Entomopathogenic fungi
D.Wind velocity
Correct Answer: Entomopathogenic fungi
Explanation:Entomopathogenic fungi are living organisms (biotic factors) that cause disease in insects, thereby limiting their populations.
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18The lowest temperature at which an insect can survive is known as the:
A.Threshold temperature
B.Optimum temperature
C.Lower lethal limit
D.Critical photoperiod
Correct Answer: Lower lethal limit
Explanation:The lower lethal limit is the temperature below which the insect dies, often due to freezing of body fluids.
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19Insects that feed on a wide variety of plant species are called:
A.Monophagous
B.Oligophagous
C.Polyphagous
D.Saprophagous
Correct Answer: Polyphagous
Explanation:Polyphagous insects feed on many different plant species across different families (e.g., Locusts, Helicoverpa).
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20Which type of pest causes no economic damage under normal conditions but requires monitoring?
A.Key pest
B.Negligible pest / R-pest
C.Major pest
D.Potential pest
Correct Answer: Negligible pest / R-pest
Explanation:Negligible pests (sometimes called potential pests or r-pests) have a GEP far below the EIL and typically do not cause economic damage unless conditions change drastically.
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21The movement of insects in response to light stimuli is called:
A.Chemotaxis
B.Phototaxis
C.Geotaxis
D.Thigmotaxis
Correct Answer: Phototaxis
Explanation:Phototaxis is the movement of an organism either towards (positive) or away from (negative) a source of light.
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22The symbiotic relationship between termites and the protozoa in their gut is an example of:
A.Parasitism
B.Commensalism
C.Mutualism
D.Amensalism
Correct Answer: Mutualism
Explanation:This is mutualism, as the termites provide a habitat and food, while the protozoa digest cellulose for the termites. Both benefit.
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23Phoresy is a type of commensalism where:
A.One insect eats another
B.One insect uses another for transport
C.Two insects compete for food
D.An insect mimics a plant
Correct Answer: One insect uses another for transport
Explanation:Phoresy is a non-parasitic interaction where one organism attaches itself to another solely for the purpose of travel.
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24What is the General Equilibrium Position (GEP)?
A.The population level causing economic damage
B.The average population density over a long period of time
C.The maximum number of insects an environment can support
D.The minimum temperature for survival
Correct Answer: The average population density over a long period of time
Explanation:GEP is the average population density of an insect species over a long period in the absence of permanent environmental changes.
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25Which edaphic (soil) factor most significantly affects soil-pupating insects?
A.Soil color
B.Soil moisture and texture
C.Soil magnetism
D.Soil depth (below 5 meters)
Correct Answer: Soil moisture and texture
Explanation:Soil moisture and texture (hardness/softness) are critical for insects that pupate or lay eggs in the soil, affecting survival and emergence.
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26An insect population that rises to damaging levels only in isolated areas or at irregular intervals is a:
A.Key pest
B.Sporadic pest
C.Regular pest
D.Persistent pest
Correct Answer: Sporadic pest
Explanation:Sporadic pests occur in few isolated localities or during certain years, often controlled by environmental factors (e.g., White grub).
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27The term used for an insect that feeds on only one species of plant (or a few closely related species) is:
A.Polyphagous
B.Monophagous
C.Omnivorous
D.Carnivorous
Correct Answer: Monophagous
Explanation:Monophagous insects have a highly specialized diet restricted to a single host species or genus (e.g., Silkworm on mulberry).
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28Which of the following describes 'Cannibalism' in insects?
A.Interspecific competition
B.Intraspecific competition
C.Symbiosis
D.Hyperparasitism
Correct Answer: Intraspecific competition
Explanation:Cannibalism is an extreme form of intraspecific competition (competition within the same species) often occurring when food is scarce or density is high.
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29What is the Economic Injury Level (EIL)?
A.The lowest population density that will cause economic damage
B.The level at which pest control is initiated
C.The point where the cost of control equals the value of yield saved
D.The level where pests are extinct
Correct Answer: The lowest population density that will cause economic damage
Explanation:The Economic Injury Level (EIL) is defined as the lowest population density of a pest that will cause economic damage.
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30An insect that parasitizes another parasite is known as a:
A.Predator
B.Hyperparasitoid
C.Endoparasite
D.Cleptoparasite
Correct Answer: Hyperparasitoid
Explanation:A hyperparasitoid is a parasitoid that develops on or inside another parasitoid.
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31Locust swarms migrating via wind currents is an example of:
A.Active flight
B.Passive dispersal
C.Phoresy
D.Taxis
Correct Answer: Passive dispersal
Explanation:While locusts fly, long-distance migration is largely aided by wind currents, which is a form of passive dispersal (anemochory).
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32High humidity combined with high temperature usually favors the population buildup of:
A.Aphids
B.Gall midges and fungi
C.Grasshoppers
D.Stored grain pests
Correct Answer: Gall midges and fungi
Explanation:High humidity and temperature generally favor rapid reproduction of mosquitoes, gall midges, and the spread of fungal pathogens.
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33The functional role of an organism in a food chain (e.g., Primary Consumer) is related to its:
A.Trophic level
B.Biomass
C.Habitat
D.Phylogeny
Correct Answer: Trophic level
Explanation:The trophic level refers to the position an organism occupies in a food chain (Producers Primary Consumers Secondary Consumers).
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34Which of the following is considered a 'Major Pest'?
A.GEP is always above EIL
B.GEP is very close to EIL and crosses it frequently
C.GEP is far below EIL
D.Pest causes no damage
Correct Answer: GEP is very close to EIL and crosses it frequently
Explanation:A Major Pest has a GEP close to the EIL, meaning small environmental changes can push the population to damaging levels frequently.
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35In the context of insect ecology, what is 'antibiosis'?
A.A symbiotic relationship
B.An adverse effect of a host plant on the biology of the insect
C.The use of antibiotics in insects
D.Competition between two insect species
Correct Answer: An adverse effect of a host plant on the biology of the insect
Explanation:Antibiosis is a mechanism of host plant resistance where the plant negatively affects the biology (survival, growth, reproduction) of the pest.
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36Short-day insects initiate diapause when:
A.Day length exceeds a critical duration
B.Day length falls below a critical duration
C.Temperature exceeds
D.Humidity is below 20%
Correct Answer: Day length falls below a critical duration
Explanation:Short-day insects are active during short days but enter diapause when the photoperiod falls below (or day length shortens to) a critical threshold.
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37A pest confined to a particular locality is known as:
A.Epidemic pest
B.Endemic pest
C.Pandemic pest
D.Sporadic pest
Correct Answer: Endemic pest
Explanation:Endemic pests are those that are regularly present in a specific region or locality.
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38The sudden outbreak of a pest in a severe form over a large area is termed:
A.Endemic
B.Epidemic
C.Sporadic
D.Regular
Correct Answer: Epidemic
Explanation:Epidemic refers to a sudden, widespread increase in the population of a pest causing severe damage.
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39Which range of temperatures is generally considered the 'Zone of Effective Activity' for most insects?
A. to
B. to
C. to
D. to
Correct Answer: to
Explanation:Most insects are active and develop normally within the range of to .
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40In a food chain, insects that feed on plants (herbivores) are classified as:
A.Producers
B.Primary Consumers
C.Secondary Consumers
D.Decomposers
Correct Answer: Primary Consumers
Explanation:Plants are producers; herbivores that eat plants are Primary Consumers.
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41What is the effect of wind on the rate of transpiration in insects?
Explanation:Wind removes the boundary layer of humid air around the insect, thereby increasing the rate of transpiration, which can lead to desiccation.
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42Camouflage and mimicry are adaptations primarily used for:
A.Thermoregulation
B.Defense against predation
C.Digestion
D.Flight mechanics
Correct Answer: Defense against predation
Explanation:Camouflage (crypsis) and mimicry are biotic adaptations to avoid detection by or deter predators.
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43Total heat energy required to complete a specific stage of development in an insect is known as:
A.Thermal constant / Degree-days
B.Specific heat
C.Latent heat
D.Solar constant
Correct Answer: Thermal constant / Degree-days
Explanation:The Thermal constant (measured in Degree-days) is the accumulation of heat units required for an insect to complete its development.
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44An insect that feeds on dead and decaying organic matter is called a:
A.Phytophage
B.Saprophage / Detritivore
C.Predator
D.Parasite
Correct Answer: Saprophage / Detritivore
Explanation:Saprophages (or detritivores) feed on decaying organic matter, playing a key role in nutrient cycling.
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45If the GEP < EIL, but environmental changes temporarily raise the population above EIL, the pest is classified as:
A.Key pest
B.Occasional pest
C.Regular pest
D.Potential pest
Correct Answer: Occasional pest
Explanation:Occasional pests have a GEP substantially below the EIL, but unusual environmental conditions can cause temporary outbreaks exceeding the EIL.
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46The aggregation of ladybird beetles in rock crevices during winter is an example of:
A.Aestivation
B.Hibernation
C.Migration
D.Parasitism
Correct Answer: Hibernation
Explanation:This overwintering behavior to survive cold temperatures is hibernation.
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47Biotic potential refers to:
A.The innate ability of a population to reproduce and survive
B.The resistance of the environment to population growth
C.The carrying capacity of the habitat
D.The death rate of the population
Correct Answer: The innate ability of a population to reproduce and survive
Explanation:Biotic potential is the maximum reproductive capacity of an organism under optimum environmental conditions.
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48Environmental Resistance includes:
A.Only abiotic factors
B.Only biotic factors
C.Both abiotic and biotic factors limiting population growth
D.The reproductive rate of the insect
Correct Answer: Both abiotic and biotic factors limiting population growth
Explanation:Environmental resistance is the sum of all physical (abiotic) and biological (biotic) factors that prevent a species from reproducing at its maximum rate.
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49Which of the following is NOT a characteristic of a predator?
A.Usually larger than the prey
B.Kills and consumes multiple prey items
C.Specific to a single host for development
D.Free-living organism
Correct Answer: Specific to a single host for development
Explanation:Predators consume multiple prey items. Being specific to a single host for development is a characteristic of a parasitoid, not a typical predator.
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50The concept that limiting factors (like temperature or food) determine the distribution and abundance of insects is encapsulated in:
A.Liebig’s Law of the Minimum
B.Newton's First Law
C.The Second Law of Thermodynamics
D.The Law of Segregation
Correct Answer: Liebig’s Law of the Minimum
Explanation:Liebig’s Law of the Minimum states that growth is dictated not by total resources available, but by the scarcest resource (limiting factor).