Free Forest Ecology MCQs with Answers

• A. All the above
• B. Biological control
• C. Natural barriers
• D. Food chains

Explanation: The transfer of energy through successive organisms creates a feeding sequence called a food chain.

• A. Inverted
• B. Inverted in forest ecosystem
• C. Both of these/Horizontal
• D. Upright

Explanation: The energy pyramid is always upright because energy is progressively lost as heat during transfer between trophic levels.

• A. Solar energy
• B. Biomass
• C. Carbohydrates in plants
• D. Producers

Explanation: Solar energy drives ecosystems because producers capture it through photosynthesis and convert it into chemical energy.

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

Explanation: Producers depend directly on atmospheric carbon dioxide to manufacture organic food by photosynthesis.

• A. Open sea
• B. Grasslands and pastures
• C. Coniferous forests
• D. Tropical and sub-tropical forest

Explanation: Tropical and subtropical forests generally have the highest gross primary production because warm temperatures, abundant moisture and a…

• A. Inverted
• B. Upright
• C. Anything possible
• D. None is correct

Explanation: The biomass pyramid in a lake is commonly inverted because the small standing crop of phytoplankton reproduces rapidly and supports a…

• A. Cycling of materials
• B. Both (a) & (b)
• C. Flow of energy
• D. None of the above

Explanation: Ecosystems are important because energy moves through trophic levels while nutrients and minerals are continuously recycled.

• A. Tiger and wild beer
• B. Snake and earthworm
• C. Deer and honey bee
• D. Crow and cow

Explanation: Deer and honey bees are primary consumers because both obtain food directly from plants, placing them at the same trophic level.

• A. No general statement can be made about relative biomass of different ecological groups
• B. The biomass of producers is less than the combined biomass of consumers and decomposers
• C. The biomass of secondary consumers is usually greater than the biomass of primary consumers
• D. The biomass of producers is generally greater than the biomass of primary consumers

Explanation: No single biomass relationship applies to every ecosystem: terrestrial systems often have more producer biomass, whereas aquatic systems…

• A. Nitrogen fixing organisms
• B. Photosynthesizing organisms
• C. Respiration
• D. Decomposers

Explanation: A food chain begins with photosynthesizing producers, such as green plants and algae, which convert solar energy into chemical energy.

• A. Herbivore
• B. Carnivore
• C. Omnivore
• D. Autotroph

Explanation: Humans are omnivores because they can obtain nutrition from both plant foods and animal foods.

• A. Forest ecosystem
• B. Grassland ecosystem
• C. Desert ecosystem
• D. Pond ecosystem

Explanation: A pond commonly supports very large numbers of microscopic primary producers, especially phytoplankton, within a limited area.

• A. The second trophic level
• B. The first trophic level
• C. The third trophic level
• D. The fourth trophic level

Explanation: Green plants produce organic food and therefore occupy the first trophic level. Herbivores that feed on them form the second trophic level.

• A. They are widely distributed
• B. They are firmly fixed to soil
• C. They alone have the capacity to fix the atmospheric CO2 in the presence of sunlight
• D. There are more herbivorous animals than the carnivorous

Explanation: Green plants are the first link because photosynthesis fixes atmospheric carbon dioxide into organic food using sunlight.

• A. Producers and primary consumers
• B. Producer, herbivores and carnivores
• C. Producers, carnivores and decomposers
• D. Producers, consumers and decomposers

Explanation: In the broad ecological sense, a food chain involves producers, consumers and decomposers, showing the transfer and recycling of energy…

• A. Area occupied by living beings
• B. Plants of a particular area
• C. Plants of world
• D. Spherical plants

Explanation: The biosphere is the global zone of life, comprising all regions of Earth where living organisms occur.

• A. Producer
• B. Primary consumer only
• C. Primary and Secondary consumer
• D. Secondary consumer only

Explanation: Humans may be primary consumers when eating plants and secondary consumers when eating herbivorous animals.

• A. Mineralization
• B. Humification
• C. Nutrient immobilization
• D. Microbe immobilization

Explanation: Nutrient immobilization is the conversion or incorporation of mineral nutrients into microbial biomass, temporarily making them…

• A. Usually primary consumers
• B. Usually secondary consumers
• C. Usually decomposers rather than consumers
• D. Usually secondary or tertiary consumers

Explanation: Carnivores feed on other animals, so they are generally secondary consumers when they eat herbivores or tertiary consumers when they eat…

• A. Both (a) & (b)
• B. Cycling of matters
• C. Flow of energy
• D. None of the above

Explanation: An ecosystem is sustained by one-way energy flow through trophic levels and the repeated cycling of nutrients such as carbon and nitrogen.