All Free Forestry MCQs with Answers

• A. 5%
• B. 3.50%
• C. 1%
• D. 0.20%

Explanation: Only about 1% of the solar energy reaching an ocean is generally converted into primary production because light penetration, nutrients…

• A. 78.2, 29.3
• B. 78.2, 3.5
• C. 29.3, 3.5
• D. 23.9, 5.3

Explanation: In Lindemann’s energy budget, approximately 29.3 gcal/cm²/year of the gross autotrophic production is used in respiration and about 3.5…

• A. Upright
• B. Inverted
• C. Rhomboidal
• D. Linear

Explanation: A forest contains a large standing biomass of trees and progressively less biomass at higher trophic levels, so its biomass pyramid is…

• A. Cyclic only
• B. Cyclic and linear
• C. Linear and cyclic
• D. Linear only

Explanation: Materials such as nutrients circulate repeatedly between organisms and the physical environment, whereas energy enters mainly as sunlight…

• A. Standing quality
• B. Climatic regime
• C. Humification and mineralization
• D. Transducers

Explanation: Humification converts dead organic matter into humus, while mineralization releases inorganic nutrients that plants can absorb.

• A. Alpine zone
• B. Sub-tropical zone
• C. Temperate zone
• D. Sub-alpine zone

Explanation: Taiga is the cold coniferous forest belt between temperate forests and tundra, commonly classified in the sub-alpine or subarctic zone.

• A. T3
• B. T4
• C. T2
• D. T1

Explanation: In a parasitic chain, plants form T1, their herbivores form T2, and parasites such as lice or parasitic bugs feeding on those herbivores…

• A. Biosphere
• B. Ecosphere
• C. Ecosystem
• D. Biome

Explanation: An ecosystem is a local functional unit containing organisms and their physical environment.

• A. Any of these
• B. Less than one
• C. More than one
• D. One

Explanation: In a mature, stabilized ecosystem, energy production through photosynthesis approximately balances community respiration.

• A. Trophic level efficiency
• B. Photosynthetic efficiency
• C. Net production efficiency
• D. Assimilation efficiency

Explanation: Assimilation efficiency is the proportion of ingested food energy that is absorbed or assimilated rather than egested.

• A. Tundra
• B. Autotrophic
• C. Heterotrophic
• D. Savana

Explanation: Tundra occurs in the cold zone near the upper limit of tree growth and extends toward the polar ice region.

• A. Transducers
• B. Converters
• C. Herbivores
• D. All of these

Explanation: Primary consumers feed directly on producers, so they are herbivores. Converters and transducers are broader functional descriptions and…

• A. 100
• B. 50
• C. 10
• D. 1

Explanation: Higher plants typically use roughly 1% of incoming solar radiation for photosynthesis, although the exact value varies with species and…

• A. Both (a) & (b)
• B. Detritivores
• C. Decomposers
• D. Heterotrophs

Explanation: Reducers are organisms that break down or reduce dead organic matter; the term is used broadly for decomposers and detritivores.

• A. Only when he lives in big cities
• B. Always
• C. Only when he lives in forest
• D. Never

Explanation: Humans are living organisms and therefore form part of the biotic community wherever they live.

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

Explanation: Plants are producers, capturing energy and forming the first trophic level.

• A. The 'balance' will be restored by an increase in the wolf population
• B. The balance will be permanently upset because the rabbits will eat the grass in the system and die of starvation
• C. Epidemics will break out in the rabbits and kill all of them
• D. Rabbits will starts eating each other

Explanation: A sudden rise in rabbits provides more prey for wolves, allowing the wolf population to increase and exert greater predation pressure.

• A. Grassland ecosystems
• B. Pond ecosystems
• C. Parasitic ecosystems
• D. Forest ecosystems

Explanation: Ponds may show an inverted or otherwise variable biomass pyramid because rapidly reproducing phytoplankton can have less standing biomass…

• A. sugar stored in plants
• B. Heat liberated during fermentation
• C. Light received from the sun
• D. Heat liberated during respiration

Explanation: Sunlight is the primary external energy source for most ecosystems, entering through photosynthesis by plants and other producers.

• A. Energy
• B. Oxygen
• C. Living organism
• D. Bacteria

Explanation: Energy must continuously enter an ecosystem because it flows through trophic levels and is eventually lost as heat.