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MATSEC SEC Environmental Studies study materials
MATSEC SEC Environmental Studies study resources

MATSEC SEC Environmental Studies practice questions

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Question 1Environmental Studies

Which gas is the main contributor to anthropogenic climate change because of its large total contribution to radiative forcing?

  1. Carbon dioxide Correct answer.
  2. Nitrogen
  3. Oxygen
  4. Argon

Explanation

Carbon dioxide is released in very large quantities by fossil fuel combustion and land-use change, and it persists in the atmosphere for centuries, so it accounts for the largest share of anthropogenic radiative forcing. Oxygen, nitrogen and argon are the main components of the atmosphere but are not greenhouse gases affected in the same way by human emissions.

Question 2Environmental Studies

Malta obtains most of its drinking water supply from which combination of sources?

  1. Import of bottled water from mainland Europe
  2. Melting snow and glacial runoff
  3. Desalination of seawater and extraction of groundwater from aquifers Correct answer.
  4. Large natural lakes and rivers

Explanation

Malta has no rivers or lakes and very limited rainfall, so it relies on reverse-osmosis desalination plants and on groundwater abstracted from its limestone aquifers. These two sources together supply the great majority of potable water on the islands.

Question 3Environmental Studies

Which term describes the variety of species, genetic diversity and ecosystems present in a given area?

  1. Biome
  2. Carrying capacity
  3. Biodiversity Correct answer.
  4. Biomagnification

Explanation

Biodiversity refers collectively to the variety of living organisms at genetic, species and ecosystem levels. The other terms describe different ecological concepts: pollutant accumulation, broad climatic regions, and population limits.

Question 4Environmental Studies

What is the primary purpose of an Environmental Impact Assessment (EIA) before a major development is approved?

  1. To replace national planning legislation with a private agreement
  2. To identify likely environmental effects and propose measures to avoid or reduce them Correct answer.
  3. To measure the exact construction cost of the project
  4. To guarantee that a project will be profitable for the developer

Explanation

An EIA is a structured process that predicts the environmental consequences of a proposed project and identifies mitigation before a decision is taken. It informs the consent decision but does not guarantee profitability or replace the legal planning framework.

Question 5Environmental Studies

Which practice is the most effective way for households to reduce the volume of waste sent to landfill?

  1. Placing all waste in one bag for convenience
  2. Buying products with extra layers of packaging
  3. Separating recyclable and organic waste for separate collection Correct answer.
  4. Burning household waste in the garden

Explanation

Source separation keeps recyclables and organic material out of the residual waste stream, allowing them to be recovered or composted instead of landfilled. Mixing wastes or burning them at home removes this recovery option and can create pollution.

Question 6Environmental Studies

Which of the following is a renewable energy source?

  1. Coal
  2. Natural gas
  3. Petroleum
  4. Wind Correct answer.

Explanation

Wind energy is continuously replenished by solar-driven atmospheric circulation and is therefore renewable. Coal, natural gas and petroleum are fossil fuels formed over millions of years and are finite.

Question 7Environmental Studies

What is the main cause of the enhanced greenhouse effect?

  1. Seasonal changes in day length
  2. Variations in the Earth's distance from the Sun
  3. Increased atmospheric concentrations of greenhouse gases from human activities Correct answer.
  4. Changes in the Moon's orbital cycle

Explanation

Human activities such as burning fossil fuels and clearing forests raise the concentration of greenhouse gases, which trap more outgoing infrared radiation and warm the surface. Astronomical and seasonal cycles do not explain the observed long-term warming trend.

Question 8Environmental Studies

Which term describes the process by which a lake gradually becomes enriched with nutrients, often leading to algal blooms?

  1. Desertification
  2. Acidification
  3. Salinisation
  4. Eutrophication Correct answer.

Explanation

Eutrophication is nutrient enrichment, usually by nitrogen and phosphorus, which stimulates excessive plant and algal growth and can deplete oxygen when the algae decay. The other terms refer to salt accumulation, land degradation in dry areas, and a fall in pH.

Question 9Environmental Studies

Why are Maltese limestone aquifers particularly vulnerable to contamination from agricultural nitrates?

  1. The aquifers are sealed by a thick clay layer
  2. The rock is highly permeable and water moves rapidly through fractures with little filtration Correct answer.
  3. Groundwater in Malta is not used for drinking
  4. The rock is completely impermeable and traps all pollutants on the surface

Explanation

Maltese limestone is heavily fissured and karstic, so water and dissolved pollutants can travel quickly through fractures with limited natural filtration. This makes groundwater easy to contaminate, and nitrate from fertilisers and livestock is a recognised problem.

Question 10Environmental Studies

A factory discharges warm cooling water into a small coastal inlet. Which effect is most likely?

  1. An increase in water density causing it to sink
  2. Complete removal of all nutrients from the water
  3. A fall in dissolved oxygen because warmer water holds less gas Correct answer.
  4. An immediate rise in dissolved oxygen

Explanation

The solubility of oxygen in water decreases as temperature rises, so thermal discharge can lower dissolved oxygen and stress aquatic organisms. Warm water is also less dense, so it tends to float rather than sink.

Question 11Environmental Studies

In a food chain, why does the concentration of a persistent fat-soluble pesticide increase at each higher trophic level?

  1. Predators drink more water than herbivores
  2. The substance is rapidly broken down before it can be stored
  3. Each higher level absorbs the chemical directly from the atmosphere
  4. The substance accumulates in body tissue faster than it is excreted and is passed up the chain Correct answer.

Explanation

Persistent fat-soluble pollutants are stored in tissue and are not readily excreted, so each organism retains the burden of all the prey it consumes. This produces biomagnification, with the highest concentrations in top predators.

Question 12Environmental Studies

Which characteristic makes a species particularly vulnerable to extinction?

  1. A generalist diet and high reproductive rate
  2. A small population confined to a single specialised habitat Correct answer.
  3. A long lifespan with wide geographic distribution
  4. A large population spread across many habitats

Explanation

Species with small populations, narrow habitat requirements and limited range have little resilience to disturbance or chance events. Generalists with large, widespread populations are generally more secure.

Question 13Environmental Studies

What is the main environmental concern associated with the use of single-use plastic bags?

  1. They persist in the environment for a long time and can harm wildlife Correct answer.
  2. They are easily digested by marine organisms
  3. They dissolve rapidly and release nutrients into soil
  4. They decompose into useful compost within days

Explanation

Conventional plastic bags are highly resistant to degradation, so they accumulate in the environment and can be ingested by or entangle wildlife. They do not break down quickly into harmless nutrients.

Question 14Environmental Studies

Which feature distinguishes a Natura 2000 site within the European Union?

  1. It is a privately owned site with no legal protection
  2. It is an area reserved solely for industrial development
  3. It is a site chosen for its high mineral deposits
  4. It is designated to protect habitats and species of European conservation importance Correct answer.

Explanation

Natura 2000 is a network of protected areas created under the Habitats and Birds Directives to conserve habitats and species of European importance. Member States must manage these sites to maintain their conservation status.

Question 15Environmental Studies

Why is the Mediterranean Sea considered especially sensitive to plastic pollution?

  1. It is semi-enclosed with limited water exchange, so pollutants accumulate Correct answer.
  2. Its water is completely frozen for most of the year
  3. It receives no shipping traffic
  4. It has no coastlines and cannot receive river input

Explanation

The Mediterranean is almost landlocked and its exchange with the Atlantic is restricted, so floating debris and pollutants tend to concentrate rather than disperse quickly. Heavy coastal population and shipping add to the input.

Question 16Environmental Studies

A coastal developer proposes building on the last remaining sand dune system on an island. Which argument best reflects the precautionary principle?

  1. Action should be delayed or modified where serious harm is possible despite scientific uncertainty Correct answer.
  2. Scientific uncertainty means no environmental rules should apply
  3. Development should always proceed because the developer bears no risk
  4. The decision should depend only on the developer's profit forecast

Explanation

The precautionary principle holds that where there is a threat of serious or irreversible damage, lack of full scientific certainty should not be used to postpone cost-effective measures. It calls for caution and mitigation rather than automatic approval or automatic prohibition.

Question 17Environmental Studies

Which of the following best describes a circular economy approach to product design?

  1. Designing products so materials can be reused, repaired or recycled at end of life Correct answer.
  2. Designing products for single use to reduce initial cost
  3. Maximising the quantity of raw material extracted per product
  4. Discarding products as soon as a newer model is available

Explanation

A circular economy keeps materials in use for as long as possible through reuse, repair, remanufacture and recycling. This contrasts with the linear take-make-dispose model that depletes resources and generates waste.

Question 18Environmental Studies

Which statement correctly explains why Malta's groundwater is affected by seawater intrusion?

  1. Freshwater is denser than seawater and sinks below it
  2. Seawater intrusion occurs only in completely dry rock
  3. Rainfall adds salt directly to the aquifer at all depths
  4. Over-abstraction lowers the freshwater lens, allowing saline water to move inland Correct answer.

Explanation

Fresh groundwater floats as a lens above denser seawater in coastal aquifers. Pumping too much freshwater lowers the lens and the interface rises and moves inland, so wells begin to draw brackish water.

Question 19Environmental Studies

Which factor most strongly increases the ecological footprint of a growing urban population?

  1. Increasing the share of waste that is recycled
  2. Rising consumption of energy, food and materials per person Correct answer.
  3. Switching from private cars to public transport
  4. Reducing household energy use

Explanation

Ecological footprint measures the land and resources needed to supply consumption and absorb wastes. Higher per-capita consumption of energy, food and materials raises demand on productive land and ecosystems.

Question 20Environmental Studies

Which type of radiation is trapped by greenhouse gases in the atmosphere?

  1. Infrared radiation emitted by the Earth's surface Correct answer.
  2. Visible light reflected by clouds
  3. Ultraviolet radiation arriving from the Sun
  4. Gamma radiation from cosmic sources

Explanation

The Earth absorbs shortwave solar radiation and re-emits energy as longwave infrared radiation, which greenhouse gases absorb and re-radiate. This trapping of outgoing infrared energy warms the surface and lower atmosphere.

Question 21Environmental Studies

A country introduces a tax on the carbon content of fuels. Which outcome is the most direct intended effect?

  1. Emissions become impossible to measure
  2. Firms and households face a price signal to reduce fossil fuel use Correct answer.
  3. The total quantity of fossil fuel burned automatically rises
  4. Renewable energy becomes more expensive relative to fossil fuels

Explanation

A carbon tax raises the cost of fossil fuels in proportion to their carbon content, giving consumers and firms an incentive to use less or switch to low-carbon alternatives. It does not by itself increase fuel use or make renewables relatively dearer.

Question 22Environmental Studies

A wind farm is proposed near an important bird migration route. Which approach best reflects the mitigation hierarchy?

  1. Compensate by building a new road and proceed without avoiding impacts
  2. Proceed as planned because compensation always fully replaces lost habitat
  3. Ignore the migration route because wind energy is renewable
  4. Avoid the sensitive location first, then minimise and compensate for any residual impact Correct answer.

Explanation

The mitigation hierarchy ranks measures in order of preference: avoid impacts, then minimise, then restore, and only then offset residual harm. Compensation is a last resort and cannot be assumed to fully replace lost ecological function.

Question 23Environmental Studies

Why does the loss of a keystone predator often cause large changes throughout an ecosystem?

  1. Predators only consume dead organic matter
  2. Removing a predator always increases total biodiversity
  3. Its removal releases prey populations, which then alter vegetation and other species Correct answer.
  4. Predators have no ecological role once they are removed

Explanation

Keystone predators exert strong top-down control on prey abundance and behaviour. When removed, prey may increase or change foraging patterns, triggering cascading effects on plants and other organisms.

Question 24Environmental Studies

Which statement best explains why Environmental Impact Assessment is considered a process rather than a single document?

  1. It consists only of a final report submitted to the developer
  2. It ends as soon as the report is printed and never involves consultation
  3. It involves scoping, baseline study, prediction, consultation, mitigation and monitoring across the project cycle Correct answer.
  4. It is a single measurement of noise at one location

Explanation

EIA is a sequence of stages including screening, scoping, baseline data collection, impact prediction, public consultation, mitigation design and post-decision monitoring. The environmental statement is a product of the process, not the whole of it.

Question 25Environmental Studies

Two coastal sites are compared for a marine protected area. Site A has high species richness and rare habitats but heavy fishing pressure; Site B is degraded but has strong community support and low enforcement costs. Which consideration best reflects an integrated conservation-planning decision?

  1. Choosing Site B automatically because it is cheaper to enforce
  2. Choosing Site A automatically because richness alone decides the outcome
  3. Weighing ecological value against threats, feasibility and social factors rather than using a single criterion Correct answer.
  4. Rejecting both sites because no site can satisfy every criterion

Explanation

Systematic conservation planning combines ecological criteria such as irreplaceability and richness with threat level, cost and social feasibility. A defensible decision balances these factors rather than relying on one indicator alone.

Question 26Environmental Studies

Which gas is the most abundant component of Earth's atmosphere and plays a central role in the nitrogen cycle?

  1. Nitrogen Correct answer.
  2. Carbon dioxide
  3. Oxygen
  4. Argon

Explanation

Nitrogen makes up roughly 78% of the atmosphere by volume, far exceeding oxygen at about 21%. Because most organisms cannot use atmospheric nitrogen directly, the nitrogen cycle depends on fixation by bacteria and lightning to convert it into usable compounds.

Question 27Environmental Studies

In the context of Maltese coastal management, what does the term 'carrying capacity' refer to?

  1. The maximum number of visitors or users an area can support without unacceptable environmental deterioration Correct answer.
  2. The amount of sand that longshore drift moves past a beach each year
  3. The total volume of sewage a treatment plant can process in one day
  4. The depth of water a harbour can safely accommodate for shipping

Explanation

Carrying capacity describes the level of use an environment can absorb before its ecological or physical quality declines. In coastal and tourism management it is used to set limits on visitor numbers so that beaches and marine habitats are not degraded.

Question 28Environmental Studies

Which process returns water vapour from plants to the atmosphere and is therefore a key component of the water cycle?

  1. Infiltration
  2. Transpiration Correct answer.
  3. Percolation
  4. Condensation

Explanation

Transpiration is the loss of water vapour through stomata in plant leaves, and together with evaporation it drives the flux of water from land surfaces back to the atmosphere. Infiltration and percolation move water downward into soil and rock, while condensation converts vapour back to liquid.

Question 29Environmental Studies

Which of the following best describes a primary consumer in an ecosystem?

  1. An organism that decomposes dead organic matter
  2. An organism that feeds only on other carnivores
  3. An organism that captures sunlight to make its own food
  4. An organism that feeds directly on producers Correct answer.

Explanation

Primary consumers are herbivores occupying the second trophic level, feeding directly on producers such as plants or algae. Decomposers and carnivores occupy different functional roles in the food web.

Question 30Environmental Studies

What is meant by 'biodiversity' in environmental studies?

  1. The number of individuals of a single endangered species
  2. The rate at which new species are discovered by science
  3. The variety of living organisms at genetic, species and ecosystem levels Correct answer.
  4. The total mass of living tissue in a given area

Explanation

Biodiversity encompasses variation within species (genetic), between species, and among ecosystems and habitats. It is broader than simply counting species in one location.

Question 31Environmental Studies

Which term describes the natural home or environment in which a particular organism lives?

  1. Habitat Correct answer.
  2. Niche
  3. Population
  4. Community

Explanation

A habitat is the physical place where an organism lives, providing the resources it needs. A niche, by contrast, describes the functional role of the species within its community, including its resource use and interactions.

Question 32Environmental Studies

Which practice is the most direct example of reusing a material rather than recycling it?

  1. Melting down aluminium cans to make new cans
  2. Composting vegetable peelings in a garden bin
  3. Refilling a glass bottle with a new product at the same facility Correct answer.
  4. Burning waste tyres to recover energy

Explanation

Reuse keeps an item in its existing form and extends its service life, avoiding the energy and processing needed to remake it. Recycling and energy recovery both involve breaking the material down or converting it.

Question 33Environmental Studies

Which unit is used to express the concentration of a pollutant in air as parts per million?

  1. Milligrams
  2. Micrometres
  3. Nanograms
  4. ppm Correct answer.

Explanation

Parts per million (ppm) is a dimensionless ratio expressing one unit of pollutant per million units of air, commonly by volume. Mass-per-volume units such as milligrams per cubic metre describe a different way of reporting concentration.

Question 34Environmental Studies

A sewage treatment plant discharges effluent containing high nitrate into a slow-flowing river. Which downstream consequence is most likely?

  1. Increased salinity of the river water
  2. Eutrophication with algal growth and later oxygen depletion Correct answer.
  3. A rise in dissolved oxygen throughout the river
  4. Immediate sedimentation of heavy metals in the riverbed

Explanation

Nitrate is a limiting nutrient in many fresh waters, so an extra input stimulates algal growth; when the algae die and decompose, oxygen is consumed and the river can become hypoxic. The other options do not follow from a nutrient input.

Question 35Environmental Studies

Why is the use of a Life Cycle Assessment (LCA) valuable when comparing two packaging materials?

  1. It compares the visual appearance of the finished products
  2. It reports the recyclability of a material without considering energy use
  3. It measures only the cost of production and transport to the retailer
  4. It quantifies environmental impacts across all stages from raw material extraction to disposal Correct answer.

Explanation

LCA systematically accounts for inputs, emissions and impacts at each stage of a product's life, allowing fair comparison between alternatives on a whole-system basis. Restricting analysis to one stage can shift burdens rather than remove them.

Question 36Environmental Studies

A population of rabbits increases rapidly after a predator is removed. Which factor is most likely to bring the population back under control naturally?

  1. A permanent increase in the birth rate of the rabbits
  2. Continued growth without any limiting factor
  3. An increase in the number of predators
  4. Depletion of food and spread of disease at high density Correct answer.

Explanation

Density-dependent factors such as food shortage and disease intensify as population density rises and act to reduce growth. An increase in predators would also limit the population, but the question specifies that predators have been removed.

Question 37Environmental Studies

Which statement best explains why an environmental management plan should include monitoring indicators?

  1. Indicators are required only to satisfy public relations goals
  2. Indicators allow managers to detect changes and adjust actions before unacceptable harm occurs Correct answer.
  3. Indicators guarantee that no environmental impact will ever occur
  4. Indicators replace the need for any baseline survey data

Explanation

Monitoring indicators provide measurable signals of environmental condition, allowing adaptive management so that corrective action can be taken early. They complement baseline data rather than replacing it.

Question 38Environmental Studies

Which of the following is an example of a point source of water pollution?

  1. A discharge pipe from an industrial plant into a river Correct answer.
  2. Leaching of nutrients from an entire agricultural region
  3. Runoff carrying fertiliser from many scattered fields
  4. Atmospheric deposition of pollutants over a wide catchment

Explanation

A point source enters the environment at a single identifiable location, such as a pipe or outfall, making it easier to regulate and treat. Diffuse sources, by contrast, arise across broad areas and are harder to control.

Question 39Environmental Studies

A developer plans to build on a floodplain. Which measure best reflects sustainable drainage principles?

  1. Channelising the river into a straight concrete culvert
  2. Installing permeable paving and retention basins to slow runoff Correct answer.
  3. Paving the entire site with impermeable concrete
  4. Removing all vegetation to increase the buildable area

Explanation

Sustainable drainage systems (SuDS) aim to manage runoff close to its source by promoting infiltration and temporary storage, reducing peak flows to downstream areas. Impermeable surfaces and channelisation increase flood risk downstream.

Question 40Environmental Studies

Why is energy from the Sun described as a renewable resource?

  1. It is only available in tropical regions
  2. It is continuously replenished on human timescales by ongoing natural processes Correct answer.
  3. It is stored in finite fossil fuel deposits
  4. It can be manufactured in laboratories on demand

Explanation

Solar energy is continuously supplied by nuclear fusion in the Sun, so its use does not deplete a finite stock on human timescales. Fossil fuels, by contrast, are finite stores of ancient solar energy.

Question 41Environmental Studies

Which approach best describes Integrated Coastal Zone Management (ICZM)?

  1. Restricting all development within one kilometre of the shore
  2. Coordinating land use, marine activities and stakeholder interests across the whole coastal zone Correct answer.
  3. Managing each coastal activity independently within separate administrative boundaries
  4. Relying solely on hard engineering structures to protect the coast

Explanation

ICZM is a cross-sectoral, participatory process that balances economic, social and environmental objectives across the coastal zone. It explicitly avoids fragmented, single-sector management.

Question 42Environmental Studies

Which statement best describes the role of decomposers in nutrient cycling?

  1. They break down dead organic matter and release mineral nutrients for reuse by producers Correct answer.
  2. They convert atmospheric nitrogen into nitrates inside root nodules
  3. They fix carbon dioxide into organic compounds during photosynthesis
  4. They transfer energy from producers to primary consumers

Explanation

Decomposers such as bacteria and fungi mineralise dead organic material, releasing nutrients like nitrogen and phosphorus back into the soil for uptake by producers. This closes the nutrient loop within ecosystems.

Question 43Environmental Studies

A country wants to reduce household waste going to landfill. Which policy instrument acts most directly on the waste producer?

  1. A tax reduction for companies that manufacture packaging
  2. A subsidy for landfill operators to expand site capacity
  3. A pay-as-you-throw charge based on the weight of residual waste collected Correct answer.
  4. A public holiday to encourage recycling awareness

Explanation

Pay-as-you-throw charges create a direct financial incentive for households to reduce residual waste and separate recyclables. Subsidies for landfill capacity work in the opposite direction.

Question 44Environmental Studies

Which statement correctly distinguishes an environmental impact from an environmental pressure?

  1. A pressure is always a natural event, while an impact is always caused by humans
  2. A pressure and an impact are interchangeable terms in environmental reporting
  3. A pressure is measured only in monetary terms, while an impact is measured in species numbers
  4. A pressure is the human activity or emission causing change, while an impact is the resulting effect on the environment Correct answer.

Explanation

In the DPSIR framework, pressures are drivers such as emissions or land take, and impacts are the changes in ecosystem condition or human welfare that result. Keeping the terms separate helps target policy at the cause rather than the symptom.

Question 45Environmental Studies

A small island state imports most of its food. Which change would most improve its food security while lowering transport emissions?

  1. Increasing imports of out-of-season produce by air freight
  2. Substituting imported food with more processed packaged products
  3. Expanding local climate-appropriate horticulture and reducing dependence on imports Correct answer.
  4. Building more refrigerated warehouses for imported goods

Explanation

Local production reduces the distance food travels and the associated emissions while diversifying supply away from import dependence. Air-freighted imports and energy-intensive storage increase both emissions and vulnerability.

Question 46Environmental Studies

An Environmental Management System following the ISO 14001 model requires an organisation to do which of the following?

  1. Replace all legal environmental obligations with internal targets
  2. Publish its financial accounts alongside its environmental report
  3. Guarantee that the organisation has zero environmental impact
  4. Establish environmental objectives and systematically monitor and review performance against them Correct answer.

Explanation

ISO 14001 is based on continual improvement through setting objectives, monitoring performance and management review. It complements legal compliance and does not promise zero impact.

Question 47Environmental Studies

In a cost-benefit analysis of a proposed desalination plant, which item is most often under-represented because it is difficult to price?

  1. The capital cost of the membrane equipment
  2. The electricity tariff paid by the operator
  3. The loss of ecosystem services from the intake and brine discharge Correct answer.
  4. The wages of plant technicians

Explanation

Ecosystem service losses are often externalities that lack market prices and are therefore undervalued in conventional cost-benefit analysis. Capital, energy and labour costs are readily quantifiable in monetary terms.

Question 48Environmental Studies

Which feature best indicates that an environmental indicator is robust for reporting purposes?

  1. It changes randomly from year to year
  2. It relies on a single unverified observation
  3. It responds predictably to the pressure it represents and is repeatable across surveys Correct answer.
  4. It is only measurable during a rare seasonal event

Explanation

A robust indicator must be sensitive to the pressure it tracks, scientifically defensible and reproducible so that trends reflect real change rather than measurement noise. Randomness or one-off observations undermine its usefulness.

Question 49Environmental Studies

A proposed road will fragment a forest used by a wide-ranging mammal. Which mitigation sequence is correctly ordered according to the mitigation hierarchy?

  1. Avoid the sensitive route, then minimise disturbance, then restore affected habitat, finally offset residual harm Correct answer.
  2. Restore habitat, then offset harm without attempting avoidance
  3. Offset residual harm first, then avoid the route if offsets prove insufficient
  4. Minimise disturbance, then offset harm, then avoid the route

Explanation

The mitigation hierarchy places avoidance first, followed by minimisation, restoration and only then offsetting of residual impacts. Offsetting is a last resort and cannot substitute for avoiding harm in the first place.

Question 50Environmental Studies

Which statement best explains why biodiversity offsetting can fail to achieve 'no net loss'?

  1. Offsets are designed only to compensate for noise impacts
  2. Offsets always produce more habitat than is destroyed
  3. Offsetting removes the need for any ecological survey
  4. Ecological equivalence is hard to prove and time lags mean gains may not offset immediate losses Correct answer.

Explanation

Offsetting depends on demonstrating equivalence between losses and gains, yet habitats differ in quality and gains often take decades to establish, creating temporary net loss. Offsets also require robust ecological survey and monitoring rather than replacing them.