Free Forest Ecology MCQs with Answers

• A. Producers
• B. Tertiary consumers
• C. Primary consumers
• D. Secondary consumers
• E. Decomposers

Explanation: Bacteria and fungi break down dead organic matter and release nutrients back into the ecosystem, so they are decomposers.

• A. Elton
• B. Odum
• C. Reiter
• D. None of these

Explanation: Charles Elton introduced the ecological pyramid concept, particularly the pyramid of numbers, in studies of food chains and animal…

• A. Trophic level 1st and herbivores
• B. Primary consumers and herbivores
• C. Primary carnivore and trophic level 2nd
• D. Secondary consumer and herbivores

Explanation: Primary consumers are herbivores because they feed directly on producers, so these terms describe the same trophic group.

• A. Producer
• B. Biomass
• C. Solar energy
• D. Carbohydrates

Explanation: Solar energy is the ultimate energy source for most ecosystems because producers capture it through photosynthesis.

• A. Decomposers
• B. Consumers
• C. All the above
• D. Producers

Explanation: Weathering releases phosphate from rocks into the soil, where plants and other producers absorb it first.

• A. Macroconsumer
• B. Decomposer
• C. Omnivore
• D. Producer

Explanation: Fungi secrete enzymes that decompose dead plants and animals, converting complex organic matter into simpler substances and recycling…

• A. Autotrophs
• B. Organotrophs
• C. Heterotrophs
• D. Auto heterotrophs

Explanation: Decomposers obtain nutrients by breaking down dead organic matter, so they are heterotrophs rather than autotrophs.

• A. Unpredictable
• B. Variable
• C. Absent
• D. Uniform

Explanation: A climatic climax community is stable under the prevailing climate and is identified by a characteristic dominant life form, making it…

• A. Tropical rain forest
• B. Temperate coniferous forests
• C. Temperate broad-leaf forest
• D. Tropical deciduous forests

Explanation: Buttresses are large, plank-like root flanges that support tall trees in shallow, nutrient-poor soils.

• A. Snakes and frogs
• B. Water insects
• C. Insects and cattle
• D. Eagle and snakes

Explanation: Primary consumers feed directly on producers, so insects that eat plants and cattle that graze are primary consumers.

• A. Temperate broad-leaf forest
• B. Desert
• C. Chaparral
• D. Temperate coniferous forest

Explanation: Cupressus and Cedrus are coniferous gymnosperms commonly associated with temperate coniferous forests.

• A. Shorea and Tectona
• B. Zizyphus and Butea
• C. Larix and Abies
• D. All of these

Explanation: Moist tropical deciduous forests are typified by valuable deciduous trees such as Shorea and Tectona.

• A. Cupressus sp.
• B. Quercus sp.
• C. Diospyros sp.
• D. Dalbergia sp.

Explanation: Quercus, the oak genus, is a classic component of temperate broad-leaved forests.

• A. Cellulose
• B. Lipids
• C. Lignin
• D. Hemi-cellulose

Explanation: Lignin is a complex, resistant polymer that anaerobic microbes degrade poorly, so it commonly remains as undegraded residue during biogas…

• A. Algae
• B. Floating plants
• C. Suspended lower plants
• D. Animals associated with plants
• E. Organisms that swim in water

Explanation: Nekton are aquatic organisms capable of actively swimming against water currents, including fish, squid and some aquatic mammals.

• A. Tropical savannah
• B. Temperate grassland
• C. Tropical rain forest
• D. Desert

Explanation: Saccharum, Imperata, Capparis and Acacia are associated with tropical savannah vegetation, which combines grasses with scattered trees or…

• A. Grazing
• B. Detritus
• C. Soaking
• D. Depleting

Explanation: The detritus food chain begins with dead organic matter rather than living green plants, so it is not directly linked to solar energy.

• A. Third
• B. Second
• C. First
• D. Fourth

Explanation: Bamboo makes its own food by photosynthesis, so it is a producer occupying the first trophic level.

• A. Pyramids of energy
• B. Pyramids of number
• C. Pyramids of biomass
• D. Pyramids of dry biomass

Explanation: The pyramid of energy is never inverted because energy is progressively lost as heat at each trophic transfer.

• A. Pyramid of numbers in a grassland ecosystem
• B. Pyramid of biomass in a pond ecosystem
• C. Pyramid of biomass in a grassland ecosystem
• D. Pyramid of energy in a pond ecosystem

Explanation: A pond may have an inverted biomass pyramid because the standing biomass of rapidly reproducing phytoplankton can be smaller than the…