CBCS Objective Botany

Thursday, April 9, 2026

Biodiversity and its conservation:

Which index is commonly used to measure species diversity?
A. Simpson’s Index
B. Hardy-Weinberg Index
C. pH Index
D. Trophic Index
Answer: A
Shannon-Wiener index considers:
A. Only species richness
B. Only evenness
C. Both richness and evenness
D. Only biomass
Answer: C
According to IUCN, “Vulnerable” species are those:
A. Already extinct
B. Facing high risk of extinction
C. Least concern
D. Not evaluated
Answer: B
Which of the following is NOT a biodiversity hotspot in India?
A. Western Ghats
B. Eastern Himalaya
C. Thar Desert
D. Indo-Burma
Answer: C
“Ecosystem services” term was popularized by:
A. Odum
B. Daily
C. Darwin
D. Haeckel
Answer: B

Competitive exclusion principle states that:
A. Two species can coexist indefinitely
B. One species excludes the other
C. Both species evolve
D. No interaction occurs
Answer: B
Which curve represents logistic growth?
A. J-shaped
B. S-shaped
C. Linear
D. Exponential
Answer: B
Maximum sustainable yield is related to:
A. Biodiversity loss
B. Resource management
C. Extinction
D. Pollution
Answer: B
Edge effect is highest in:
A. Core habitat
B. Ecotone
C. Desert
D. Ocean
Answer: B
Species-area relationship is expressed by:
A. S = cA^z
B. E = mc²
C. PV = nRT
D. H = q/t
Answer: A

Island biogeography theory was proposed by:
A. Darwin
B. MacArthur & Wilson
C. Odum
D. Mendel
Answer: B
Species richness increases with:
A. Decrease in area
B. Increase in area
C. Climate only
D. Soil only
Answer: B
Which factor increases extinction risk?
A. Large population
B. Small population size
C. High diversity
D. Stable habitat
Answer: B
“Umbrella species” concept is used for:
A. Soil conservation
B. Habitat protection
C. Water management
D. Climate study
Answer: B

Project Tiger in India was launched in:
A. 1965
B. 1973
C. 1982
D. 1991
Answer: B
Convention on Biological Diversity (CBD) was signed in:
A. 1971
B. 1982
C. 1992
D. 2002
Answer: C
Ex-situ conservation includes:
A. National park
B. Wildlife sanctuary
C. Zoo
D. Biosphere reserve
Answer: C
Which is a biosphere reserve in India?
A. Kaziranga
B. Nilgiri
C. Corbett
D. Gir
Answer: B

Realized niche is smaller than fundamental niche due to:
A. Abiotic factors
B. Biotic interactions
C. Climate
D. Soil
Answer: B
r-selected species are favored in:
A. Stable habitats
B. Disturbed habitats
C. Forests
D. Mountains
Answer: B
Genetic drift causes:
A. Directed change
B. Random change
C. Selection
D. Adaptation
Answer: B
Biodiversity loss affects:
A. Food chain
B. Ecosystem services
C. Climate
D. All
Answer: D

Which is NOT an ecosystem service?
A. Pollination
B. Soil formation
C. Mining
D. Nutrient cycling
Answer: C
Indicator species are useful for:
A. Soil fertility
B. Environmental monitoring
C. Water storage
D. Climate change
Answer: B
Keystone species concept was introduced by:
A. Paine
B. Darwin
C. Odum
D. Haeckel
Answer: A
Lichens are indicators of:
A. Water pollution
B. Air pollution
C. Soil fertility
D. Temperature
Answer: B

Extinction debt refers to:
A. Immediate extinction
B. Future extinction due to past habitat loss
C. No extinction
D. Rapid growth
Answer: B
Minimum viable population depends on:
A. Genetics
B. Demography
C. Environment
D. All
Answer: D
Ecological resilience is:
A. Resistance to change
B. Recovery after disturbance
C. Stability
D. Productivity
Answer: B
Biopiracy involves:
A. Conservation
B. Illegal use of genetic resources
C. Protection
D. Awareness
Answer: B

Most species-rich biome is:
A. Desert
B. Grassland
C. Tropical rainforest
D. Tundra
Answer: C
Maximum biodiversity in India occurs in:
A. Gangetic plains
B. Western Ghats
C. Thar Desert
D. Deccan plateau
Answer: B
Conservation hotspot concept was given by:
A. Myers
B. Darwin
C. Odum
D. Haeckel
Answer: A
Largest cause of biodiversity loss globally:
A. Pollution
B. Habitat destruction
C. Climate change
D. Mining
Answer: B
Ecotourism should be:
A. Exploitative
B. Sustainable
C. Industrial
D. Urban
Answer: B

Wednesday, April 8, 2026

Soil Formation, Properties & Conservation

🌍 Soil Origin, Formation & Composition

Soil is formed from:
A. Water
B. Parent rock
C. Air
D. Plants
Answer: B
Soil formation is also called:
A. Pedogenesis
B. Photosynthesis
C. Respiration
D. Weathering
Answer: A
Weathering of rocks is:
A. Biological only
B. Physical, chemical & biological
C. Chemical only
D. Physical only
Answer: B
Parent material of soil is known as:
A. Horizon
B. Regolith
C. Profile
D. Biomass
Answer: B
Soil forming factors include:
A. Climate
B. Organisms
C. Relief
D. All
Answer: D
Residual soil is formed by:
A. Transport
B. In-situ weathering
C. Deposition
D. Erosion
Answer: B
Transported soil is moved by:
A. Water
B. Wind
C. Glacier
D. All
Answer: D
Major component of soil is:
A. Organic matter
B. Minerals
C. Water
D. Air
Answer: B
Soil organic matter mainly consists of:
A. Sand
B. Humus
C. Clay
D. Silt
Answer: B
Ideal soil composition is:
A. 100% minerals
B. Minerals + air + water + organic matter
C. Only organic matter
D. Only water
Answer: B

🌱 Soil Profile & Types

Topsoil is called:
A. A-horizon
B. B-horizon
C. C-horizon
D. O-horizon
Answer: A
Subsoil is:
A. A-horizon
B. B-horizon
C. C-horizon
D. D-horizon
Answer: B
Bedrock layer is:
A. A
B. B
C. C
D. R
Answer: D
Horizon rich in humus is:
A. A
B. B
C. C
D. R
Answer: A
Black soil is also called:
A. Laterite
B. Regur
C. Alluvial
D. Desert
Answer: B
Alluvial soil is deposited by:
A. Wind
B. Rivers
C. Glaciers
D. Volcano
Answer: B
Laterite soil forms in:
A. Dry areas
B. High rainfall
C. Cold regions
D. Mountains
Answer: B
Red soil color is due to:
A. Calcium
B. Iron oxide
C. Magnesium
D. Nitrogen
Answer: B

🦠 Soil Microorganisms & Processes

Nitrogen fixation is carried out by:
A. Fungi
B. Bacteria
C. Algae
D. Protozoa
Answer: B
Rhizobium lives in:
A. Leaves
B. Root nodules
C. Stem
D. Soil only
Answer: B
Decomposition is done by:
A. Producers
B. Decomposers
C. Consumers
D. Herbivores
Answer: B
Nitrification converts:
A. N₂ → NH₃
B. NH₃ → NO₃⁻
C. NO₃⁻ → N₂
D. NH₃ → N₂
Answer: B
Denitrification converts:
A. NH₃ → NO₃⁻
B. NO₃⁻ → N₂
C. N₂ → NH₃
D. NO₂ → NH₃
Answer: B
Humification leads to formation of:
A. Sand
B. Humus
C. Clay
D. Silt
Answer: B
Mineralization releases:
A. Organic nutrients
B. Inorganic nutrients
C. Water
D. Air
Answer: B

🌪️ Soil Erosion

Removal of topsoil is called:
A. Weathering
B. Soil erosion
C. Leaching
D. Deposition
Answer: B
Wind erosion is common in:
A. Wet areas
B. Arid regions
C. Forest
D. Mountains
Answer: B
Sheet erosion occurs on:
A. Flat surface
B. Gentle slope
C. Steep slope
D. Mountains
Answer: B
Gully erosion forms:
A. Small cracks
B. Deep channels
C. Flat soil
D. Sand dunes
Answer: B
Soil erosion leads to:
A. Fertility increase
B. Land degradation
C. Soil formation
D. Humus formation
Answer: B

🔄 Biogeochemical Cycles

Carbon cycle involves:
A. Oxygen only
B. Carbon movement
C. Water
D. Nitrogen
Answer: B
Photosynthesis fixes:
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen
Answer: B
Major reservoir of carbon is:
A. Soil
B. Atmosphere
C. Oceans
D. Forest
Answer: C
Water cycle is driven by:
A. Wind
B. Sun
C. Soil
D. Plants
Answer: B
Transpiration occurs in:
A. Soil
B. Plants
C. Water
D. Rocks
Answer: B

🌿 Soil Conservation Methods

Contour farming reduces:
A. Wind erosion
B. Water erosion
C. Pollution
D. Salinity
Answer: B
Mulching helps in:
A. Moisture conservation
B. Erosion increase
C. Salinity
D. Pollution
Answer: A
Strip cropping controls:
A. Wind erosion
B. Water erosion
C. Salinity
D. Pollution
Answer: A
Terracing is used in:
A. Plains
B. Slopes
C. Deserts
D. Wetlands
Answer: B
Afforestation helps in:
A. Soil erosion
B. Soil conservation
C. Pollution
D. Mining
Answer: B

🔧 Soil Reclamation

Gypsum is used for:
A. Acidic soil
B. Alkaline soil
C. Sandy soil
D. Clay soil
Answer: B
Lime is used to treat:
A. Alkaline soil
B. Acidic soil
C. Saline soil
D. Desert soil
Answer: B
Leaching helps in removal of:
A. Salts
B. Water
C. Soil
D. Nutrients
Answer: A
Drainage improves:
A. Waterlogging
B. Soil aeration
C. Salinity
D. Erosion
Answer: B

🔥 High-Level Competitive Questions

Pedology deals with:
A. Soil formation
B. Soil physics
C. Soil chemistry
D. Soil biology
Answer: A
Edaphic factors relate to:
A. Climate
B. Soil
C. Water
D. Air
Answer: B
Soil texture depends on:
A. Color
B. Particle size
C. Water
D. Humus
Answer: B
Clay soil has:
A. High permeability
B. Low permeability
C. No water
D. No nutrients
Answer: B
Sandy soil has:
A. High water retention
B. Low water retention
C. High nutrients
D. No air
Answer: B
Loamy soil is best for:
A. Construction
B. Agriculture
C. Mining
D. Industry
Answer: B
Soil pH affects:
A. Texture
B. Nutrient availability
C. Color
D. Air
Answer: B
Buffer capacity of soil depends on:
A. Sand
B. Clay & organic matter
C. Water
D. Air
Answer: B
Soil salinity reduces:
A. Growth
B. Fertility
C. Yield
D. All
Answer: D
Conservation tillage reduces:
A. Yield
B. Soil erosion
C. Fertility
D. Water
Answer: B
Overgrazing leads to:
A. Soil formation
B. Land degradation
C. Fertility
D. Growth
Answer: B

Ecology & Ecosystem

🌱 Basic Ecology & Interactions

Ecology is the study of:
A. Plants
B. Animals
C. Organisms & environment
D. Soil
Answer: C
The term “Ecology” was coined by:
A. Darwin
B. Haeckel
C. Odum
D. Mendel
Answer: B
Autecology deals with:
A. Community
B. Individual species
C. Ecosystem
D. Population
Answer: B
Synecology studies:
A. Individual organism
B. Community interactions
C. Cells
D. Genes
Answer: B
Temperature is a:
A. Biotic factor
B. Abiotic factor
C. Genetic factor
D. Chemical factor
Answer: B
Competition is a:
A. Positive interaction
B. Negative interaction
C. Neutral interaction
D. Symbiosis
Answer: B
Mutualism is:
A. Harmful to both
B. Beneficial to both
C. Neutral
D. Parasitic
Answer: B
Amensalism means:
A. Both benefit
B. One harmed, other unaffected
C. Both harmed
D. One benefits
Answer: B
Predation is:
A. Positive interaction
B. Negative interaction
C. Neutral
D. Commensalism
Answer: B
Commensalism is:
A. Both benefit
B. One benefits, other unaffected
C. Both harmed
D. Competition
Answer: B

🌍 Ecosystem Concept & Structure

Ecosystem term was given by:
A. Tansley
B. Odum
C. Darwin
D. Haeckel
Answer: A
Ecosystem includes:
A. Biotic only
B. Abiotic only
C. Biotic + Abiotic
D. Soil only
Answer: C
Producers are:
A. Heterotrophs
B. Autotrophs
C. Consumers
D. Decomposers
Answer: B
Primary consumers are:
A. Carnivores
B. Herbivores
C. Omnivores
D. Decomposers
Answer: B
Decomposers mainly include:
A. Plants
B. Bacteria & fungi
C. Animals
D. Algae
Answer: B
Detritivores feed on:
A. Live plants
B. Dead organic matter
C. Animals
D. Soil
Answer: B
Standing crop refers to:
A. Total biomass
B. Energy
C. Soil
D. Water
Answer: A

⚡ Energy Flow & Productivity

Energy flow in ecosystem is:
A. Cyclic
B. Unidirectional
C. Bidirectional
D. Static
Answer: B
10% law was given by:
A. Odum
B. Lindeman
C. Darwin
D. Elton
Answer: B
Primary productivity is:
A. Energy loss
B. Biomass production
C. Respiration
D. Decomposition
Answer: B
GPP stands for:
A. Gross Primary Productivity
B. General Productivity
C. Growth Production
D. Global Productivity
Answer: A
NPP =
A. GPP + R
B. GPP – R
C. R – GPP
D. GPP only
Answer: B
Secondary productivity occurs in:
A. Producers
B. Consumers
C. Decomposers
D. Soil
Answer: B

🔄 Ecological Succession

Succession is:
A. Sudden change
B. Gradual change in community
C. No change
D. Soil loss
Answer: B
Primary succession starts on:
A. Existing soil
B. Bare area
C. Forest
D. Grassland
Answer: B
Secondary succession occurs in:
A. New land
B. Disturbed area
C. Desert
D. Ocean
Answer: B
Pioneer species are:
A. Final species
B. First colonizers
C. Predators
D. Decomposers
Answer: B
Climax community is:
A. Unstable
B. Stable
C. Temporary
D. Transitional
Answer: B
Hydrosere begins in:
A. Desert
B. Water
C. Forest
D. Grassland
Answer: B
Xerosere starts in:
A. Water
B. Dry habitat
C. Forest
D. Wetland
Answer: B
Autogenic succession is driven by:
A. External factors
B. Community itself
C. Climate only
D. Soil only
Answer: B
Allogenic succession is caused by:
A. Internal factors
B. External factors
C. Plants
D. Animals
Answer: B
Autotrophic succession has:
A. Heterotroph dominance
B. Producer dominance
C. No plants
D. Animals only
Answer: B
Heterotrophic succession begins with:
A. Plants
B. Animals
C. Organic matter
D. Soil
Answer: C

🌐 Food Chain, Web & Pyramids

Food chain shows:
A. Energy flow
B. Water flow
C. Soil formation
D. Climate
Answer: A
Food web is:
A. Single chain
B. Interconnected chains
C. Soil network
D. Water cycle
Answer: B
Grazing food chain starts with:
A. Dead matter
B. Producers
C. Carnivores
D. Decomposers
Answer: B
Detritus food chain starts with:
A. Plants
B. Dead organic matter
C. Animals
D. Water
Answer: B
Pyramid of energy is always:
A. Inverted
B. Upright
C. Neutral
D. Circular
Answer: B
Pyramid of biomass is inverted in:
A. Forest
B. Grassland
C. Aquatic ecosystem
D. Desert
Answer: C

🌳 Types of Ecosystems

Forest ecosystem has:
A. Low biodiversity
B. High biodiversity
C. No producers
D. No consumers
Answer: B
Grassland ecosystem is dominated by:
A. Trees
B. Grasses
C. Shrubs
D. Algae
Answer: B
Crop land ecosystem is:
A. Natural
B. Artificial
C. Marine
D. Desert
Answer: B
Aquatic ecosystem includes:
A. Forest
B. Water bodies
C. Desert
D. Grassland
Answer: B
Pond ecosystem is:
A. Terrestrial
B. Freshwater
C. Marine
D. Desert
Answer: B

🌵 Ecological Adaptations

Hydrophytes are adapted to:
A. Dry habitat
B. Water
C. Saline soil
D. Air
Answer: B
Xerophytes are found in:
A. Wet areas
B. Dry areas
C. Forest
D. Water
Answer: B
Halophytes grow in:
A. Freshwater
B. Saline soil
C. Desert
D. Mountains
Answer: B
Epiphytes grow on:
A. Soil
B. Other plants
C. Water
D. Rocks
Answer: B
Xerophytes show:
A. Large leaves
B. Thick cuticle
C. Thin cuticle
D. No roots
Answer: B
Hydrophytes have:
A. Reduced roots
B. Deep roots
C. Thick bark
D. No leaves
Answer: A
Halophytes maintain osmotic balance by:
A. Salt excretion
B. Water loss
C. Drying
D. Respiration
Answer: A

🔥 High-Level Competitive (Very Important)

Ecological niche refers to:
A. Habitat
B. Functional role
C. Population
D. Species
Answer: B
Ecotone is:
A. Core area
B. Transition zone
C. Desert
D. Forest
Answer: B
Edge effect leads to:
A. Low diversity
B. High diversity
C. No change
D. Soil loss
Answer: B
Biomagnification increases along:
A. Same level
B. Trophic levels
C. Soil layers
D. Atmosphere
Answer: B
Bioaccumulation occurs in:
A. Ecosystem
B. Organisms
C. Soil
D. Water
Answer: B
Carrying capacity depends on:
A. Climate
B. Resources
C. Population
D. All
Answer: D
Limiting factor concept was given by:
A. Liebig
B. Darwin
C. Odum
D. Haeckel
Answer: A
Law of tolerance was proposed by:
A. Shelford
B. Liebig
C. Darwin
D. Mendel
Answer: A

Natural resources & Sustainable utilization

🌱 Land Utilization, Soil Degradation & Restoration

Land capability classification system was developed by?
A. FAO
B. USDA
C. UNEP
D. ICAR
Answer: B
Laterization is common in which climate?
A. Arid
B. Semi-arid
C. Tropical high rainfall
D. Temperate
Answer: C
Desertification is mainly due to?
A. Afforestation
B. Overgrazing
C. Irrigation
D. Flooding
Answer: B
Universal Soil Loss Equation (USLE) estimates?
A. Soil fertility
B. Soil erosion
C. Crop yield
D. Rainfall
Answer: B
Which process removes nutrients from soil?
A. Humification
B. Leaching
C. Aggregation
D. Mineralization
Answer: B
Sheet erosion is most common in?
A. Steep slopes
B. Gentle slopes
C. Forest areas
D. Wetlands
Answer: B
Salinity problem is mainly associated with?
A. Rainfed farming
B. Irrigated agriculture
C. Forest soil
D. Desert soil
Answer: B
Contour bunding controls?
A. Wind erosion
B. Water erosion
C. Salinity
D. Pollution
Answer: B
Gully erosion is severe in?
A. Flat land
B. Loose soil slopes
C. Wetlands
D. Forests
Answer: B
Land degradation neutrality concept is promoted by?
A. FAO
B. UNCCD
C. WHO
D. UNESCO
Answer: B
Soil acidification is mainly due to?
A. Organic manure
B. Excess fertilizers
C. Irrigation
D. Rainfall
Answer: B
Wind erosion is maximum in soils with?
A. High moisture
B. Coarse texture
C. Clay content
D. Vegetation
Answer: B
Strip cropping controls?
A. Wind erosion
B. Water erosion
C. Salinity
D. Pollution
Answer: A
Waterlogging causes deficiency of?
A. Nitrogen
B. Oxygen
C. Carbon
D. Sulphur
Answer: B
Soil structure deterioration leads to?
A. High fertility
B. Reduced infiltration
C. Better aeration
D. Higher yield
Answer: B
Biochar improves?
A. Soil fertility
B. Erosion
C. Salinity
D. Pollution
Answer: A
Phytoremediation uses?
A. Microbes
B. Plants
C. Chemicals
D. Animals
Answer: B
Bioremediation involves?
A. Plants
B. Microorganisms
C. Machines
D. Radiation
Answer: B
Gypsum is used to reclaim?
A. Acidic soil
B. Saline soil
C. Alkaline soil
D. Sandy soil
Answer: C
Lime is used for?
A. Acidic soil
B. Saline soil
C. Alkaline soil
D. Clay soil
Answer: A
Agroforestry promotes?
A. Soil erosion
B. Sustainable land use
C. Pollution
D. Desertification
Answer: B

💧 Water Resources & Wetlands

Largest freshwater reserve is?
A. Rivers
B. Lakes
C. Groundwater
D. Glaciers
Answer: D
BOD indicates?
A. Oxygen production
B. Organic pollution
C. Temperature
D. Salinity
Answer: B
COD measures?
A. Biological oxygen
B. Chemical oxygen demand
C. Dissolved oxygen
D. Solids
Answer: B
Eutrophication leads to?
A. Clear water
B. Algal bloom
C. Low nutrients
D. Cooling
Answer: B
Hardness of water is due to?
A. Sodium
B. Calcium & Magnesium
C. Potassium
D. Iron
Answer: B
Water harvesting helps in?
A. Flooding
B. Groundwater recharge
C. Pollution
D. Salinity
Answer: B
High BOD indicates?
A. Clean water
B. Polluted water
C. Neutral water
D. Hard water
Answer: B
Thermal pollution affects?
A. Soil
B. Aquatic life
C. Air
D. Forest
Answer: B
Wetlands are rich in?
A. Minerals
B. Organic matter
C. Sand
D. Rocks
Answer: B
Mangroves occur in?
A. Desert
B. Freshwater
C. Coastal wetlands
D. Mountains
Answer: C
Wetlands are called kidneys because they?
A. Store water
B. Filter pollutants
C. Provide habitat
D. Recharge water
Answer: B
Ramsar Convention year?
A. 1965
B. 1971
C. 1982
D. 1992
Answer: B
Montreux Record includes?
A. Forests
B. Threatened wetlands
C. Parks
D. Deserts
Answer: B
India joined Ramsar in?
A. 1971
B. 1982
C. 1991
D. 2000
Answer: B
Chilika Lake is?
A. Freshwater
B. Brackish lagoon
C. River
D. Glacier
Answer: B

🌳 Forests & Biological Invasion

Timber is?
A. Minor product
B. Major forest product
C. Waste
D. Fuel
Answer: B
Lac & resin are?
A. Major
B. Minor forest products
C. Fossil
D. Crops
Answer: B
NPP is highest in?
A. Desert
B. Tundra
C. Tropical rainforest
D. Grassland
Answer: C
Biological invasion means?
A. Soil erosion
B. Alien species entry
C. Fire
D. Grazing
Answer: B
Parthenium is?
A. Crop
B. Invasive weed
C. Tree
D. Medicinal
Answer: B
Social forestry aims at?
A. Industry
B. Community needs
C. Export
D. Mining
Answer: B
Joint Forest Management involves?
A. Industry
B. Local people
C. Foreign agencies
D. Government only
Answer: B
Deforestation leads to?
A. Stability
B. Soil erosion
C. Rainfall increase
D. Cooling
Answer: B
Keystone species help in?
A. Growth
B. Ecosystem balance
C. Invasion
D. Pollution
Answer: B

⚡ Energy Resources

Coal is?
A. Renewable
B. Non-renewable
C. Inexhaustible
D. Solar
Answer: B
Hydropower depends on?
A. Sun
B. Flowing water
C. Wind
D. Biomass
Answer: B
Nuclear energy is based on?
A. Combustion
B. Fission
C. Respiration
D. Photosynthesis
Answer: B
Biogas contains mainly?
A. CO₂
B. Methane
C. O₂
D. N₂
Answer: B
LPG contains?
A. Methane
B. Propane & Butane
C. Ethane
D. Hydrogen
Answer: B
Geothermal energy comes from?
A. Sun
B. Earth heat
C. Wind
D. Water
Answer: B
Hydrogen fuel produces?
A. CO₂
B. Water
C. SO₂
D. Smoke
Answer: B
Calorific value indicates?
A. Mass
B. Energy content
C. Volume
D. Density
Answer: B

♻️ Resource Management

Tragedy of Commons given by?
A. Darwin
B. Hardin
C. Malthus
D. Odum
Answer: B
Sustainable development means?
A. Present only
B. Future only
C. Present + future balance
D. Industry
Answer: C
Carbon footprint measures?
A. Water
B. GHG emission
C. Soil
D. Energy
Answer: B
Circular economy promotes?
A. Waste
B. Reuse & recycling
C. Mining
D. Cutting
Answer: B
Carrying capacity is?
A. Growth
B. Max sustainable load
C. Industry
D. Energy
Answer: B
Ecological footprint shows?
A. Soil
B. Resource demand
C. Rainfall
D. Energy
Answer: B
Life Cycle Assessment studies?
A. Soil
B. Product impact
C. Water
D. Forest
Answer: B
Drip irrigation helps in?
A. Erosion
B. Water saving
C. Pollution
D. Salinity
Answer: B
Rainwater harvesting reduces?
A. Runoff loss
B. Fertility
C. Pollution
D. Energy
Answer: A
Sustainable yield ensures?
A. Overuse
B. Continuous availability
C. Depletion
D. Waste
Answer: B

🌱 Advanced Land, Soil & Restoration

Soil compaction reduces:
A. Runoff
B. Infiltration
C. Fertility
D. Salinity
Answer: B
Desertification is most severe in:
A. Humid regions
B. Drylands
C. Mountains
D. Wetlands
Answer: B
Laterite soil is rich in:
A. Nitrogen
B. Iron & Aluminum
C. Calcium
D. Potassium
Answer: B
Alkali soil has high:
A. pH
B. Moisture
C. Nitrogen
D. Organic matter
Answer: A
Soil erosion tolerance limit is defined as:
A. Maximum rainfall
B. Acceptable soil loss
C. Crop yield
D. Water loss
Answer: B
Shelter belts are used to control:
A. Water erosion
B. Wind erosion
C. Salinity
D. Pollution
Answer: B
Check dams are used in:
A. Soil testing
B. Watershed management
C. Mining
D. Industry
Answer: B
Mulching helps in:
A. Increasing erosion
B. Conserving soil moisture
C. Increasing salinity
D. Soil compaction
Answer: B

💧 Water Resources (Advanced)

DO (Dissolved Oxygen) is highest in:
A. Polluted water
B. Clean water
C. Warm water
D. Stagnant water
Answer: B
Minimum DO required for aquatic life is about:
A. 1 mg/L
B. 3 mg/L
C. 5 mg/L
D. 10 mg/L
Answer: C
Hard water does not form lather due to:
A. Na⁺
B. Ca²⁺ & Mg²⁺
C. K⁺
D. Fe³⁺
Answer: B
Fluoride contamination causes:
A. Cholera
B. Fluorosis
C. Malaria
D. Typhoid
Answer: B
Arsenic contamination mainly affects:
A. Skin
B. Bones
C. Blood
D. Lungs
Answer: A
Reverse osmosis is used for:
A. Soil cleaning
B. Water purification
C. Air cleaning
D. Forest conservation
Answer: B

🌾 Wetlands (Advanced)

Peat formation occurs in:
A. Forests
B. Wetlands
C. Deserts
D. Mountains
Answer: B
Wetlands act as carbon:
A. Sources
B. Sinks
C. Pollutants
D. Filters only
Answer: B
Ramsar sites are selected based on:
A. Economic value
B. Ecological importance
C. Industrial use
D. Population
Answer: B
Loktak Lake is famous for:
A. Coral reefs
B. Floating vegetation (phumdis)
C. Mangroves
D. Sand dunes
Answer: B

🌳 Forests & Biodiversity (Advanced)

Primary productivity depends on:
A. Soil only
B. Climate & sunlight
C. Water only
D. Minerals only
Answer: B
Clear cutting leads to:
A. Soil conservation
B. Biodiversity loss
C. Rainfall increase
D. Cooling
Answer: B
Monoculture forestry causes:
A. Biodiversity increase
B. Vulnerability to pests
C. Soil improvement
D. Stability
Answer: B
Exotic species are:
A. Native
B. Introduced species
C. Endemic
D. Extinct
Answer: B
Lantana camara is:
A. Crop
B. Invasive species
C. Tree
D. Grass
Answer: B

⚡ Energy (Advanced)

Solar constant is approx:
A. 1.36 kW/m²
B. 2 kW/m²
C. 0.5 kW/m²
D. 5 kW/m²
Answer: A
Wind energy depends on:
A. Velocity³
B. Velocity²
C. Velocity
D. Constant
Answer: A
Biomass energy is:
A. Non-renewable
B. Renewable
C. Fossil
D. Nuclear
Answer: B
Ethanol fuel is produced from:
A. Coal
B. Sugarcane
C. Petroleum
D. Uranium
Answer: B
Biodiesel is obtained from:
A. Algae/vegetable oils
B. Coal
C. Gas
D. Water
Answer: A
Nuclear fusion occurs in:
A. Reactors
B. Sun
C. Earth
D. Ocean
Answer: B

♻️ Resource Management (Advanced)

Agenda 21 is related to:
A. Energy
B. Sustainable development
C. Forests
D. Soil
Answer: B
REDD+ program deals with:
A. Soil erosion
B. Forest conservation
C. Water pollution
D. Mining
Answer: B
Green GDP includes:
A. Only income
B. Environmental cost
C. Population
D. Industry
Answer: B
Ecosystem services include:
A. Only food
B. Benefits from ecosystems
C. Minerals
D. Energy
Answer: B
Payment for Ecosystem Services (PES) means:
A. Free use
B. Paying for ecosystem benefits
C. Tax
D. Fine
Answer: B
Blue economy focuses on:
A. Forest
B. Oceans
C. Soil
D. Air
Answer: B

🔥 Mixed High-Level (Very Important)

Maximum water use in India is in:
A. Industry
B. Agriculture
C. Domestic
D. Transport
Answer: B
Groundwater depletion is highest due to:
A. Rainfall
B. Irrigation
C. Industry
D. Forest
Answer: B
Soil organic matter improves:
A. Structure
B. Pollution
C. Salinity
D. Erosion
Answer: A
Buffer capacity of soil depends on:
A. Texture & organic matter
B. Rainfall
C. Temperature
D. Wind
Answer: A
Carrying capacity exceedance leads to:
A. Stability
B. Degradation
C. Growth
D. Balance
Answer: B
Ecological succession leads to:
A. Instability
B. Stable climax community
C. Desert
D. Pollution
Answer: B
Bioaccumulation occurs in:
A. Soil
B. Organisms
C. Air
D. Water
Answer: B
Biomagnification increases along:
A. Same level
B. Trophic levels
C. Soil layers
D. Atmosphere
Answer: B
Sustainable agriculture includes:
A. Chemicals
B. Crop rotation
C. Deforestation
D. Mining
Answer: B
Conservation tillage reduces:
A. Yield
B. Soil erosion
C. Fertility
D. Water
Answer: B
Over-extraction of groundwater causes:
A. Flood
B. Land subsidence
C. Forest growth
D. Rainfall
Answer: B
Climate change mainly affects:
A. Soil only
B. Water cycle
C. Rocks
D. Minerals
Answer: B
Ozone depletion is caused by:
A. CO₂
B. CFCs
C. O₂
D. N₂
Answer: B
Sustainable forestry ensures:
A. Deforestation
B. Continuous supply
C. Mining
D. Pollution
Answer: B
Agro-ecosystem stability depends on:
A. Monoculture
B. Diversity
C. Chemicals
D. Irrigation
Answer: B
Urbanization leads to:
A. Soil conservation
B. Land degradation
C. Forest growth
D. Stability
Answer: B
Renewable energy reduces:
A. Pollution
B. Fertility
C. Water
D. Soil
Answer: A
Resource conservation means:
A. Overuse
B. Sustainable use
C. Waste
D. Mining
Answer: B
Ecological balance is maintained by:
A. Humans
B. Biodiversity
C. Industry
D. Mining
Answer: B
Food security depends on:
A. Soil health
B. Industry
C. Mining
D. Transport
Answer: A
Green revolution caused:
A. Soil degradation
B. Forest growth
C. Water saving
D. Biodiversity increase
Answer: A
Sustainable future depends on:
A. Resource conservation
B. Overuse
C. Pollution
D. Mining
Answer: A