All Free Forestry MCQs with Answers
Every Forestry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
1,681 questions · page 41 of 85
- A. Lime rocks contribute to CO2 of water
- B. 75% of total carbon lies in geological component
- C. CO2 is returned by combustion of fuel
- D. Atmospheric CO2 gets dissolved in water
Explanation: Limestone weathering can add carbon dioxide to water, dissolved CO2 remains part of the cycle, and combustion returns CO2 to the…
Correct answer: 75% of total carbon lies in geological component- A. FeS and Fe2S3
- B. Organic sulphates and -SH
- C. Soluble inorganic sulphates
- D. All of these
Explanation: Soluble inorganic sulphates are carried into the ocean through leaching and contribute to marine sulphate deposits.
Correct answer: Soluble inorganic sulphates- A. Grasslands
- B. Epiphytes
- C. Planktons
- D. Forests
Explanation: Forests regulate the hydrological cycle by intercepting rainfall, promoting infiltration, storing water and releasing it through…
Correct answer: Forests- A. 8 x 10^12 kg
- B. 9 x 10^13 kg
- C. 9 x 10^11 kg
- D. 8 x 10^10 kg
Explanation: Global photosynthesis fixes roughly 9 × 10^13 kg of carbon dioxide annually, although the exact estimate varies with the method and period…
Correct answer: 9 x 10^13 kg- A. 150
- B. 1,500
- C. 300
- D. 3,000
Explanation: Odum gives approximately 1,500 kcal/m²/day as the light energy absorbed by plant cover.
Correct answer: 1,500- A. Metabolism of producers
- B. Metabolism of consumers
- C. Both (a) & (b)
- D. Combustion of fuel
Explanation: Combustion of coal, petroleum and other sulphur-containing fuels oxidizes sulphur and releases sulphur dioxide into the atmosphere.
Correct answer: Combustion of fuel- A. Atmospheric CO2
- B. CO2 of carbonic rocks
- C. Fossil fuel
- D. All of the above
Explanation: Plants obtain their carbon mainly by taking atmospheric CO₂ into leaves during photosynthesis and converting it into organic compounds.
Correct answer: Atmospheric CO2- A. Nitrogen
- B. Phosphorus
- C. Hydrologic
- D. Sulphur
Explanation: The hydrologic cycle is directly powered by solar energy, which evaporates water and drives atmospheric circulation and precipitation.
Correct answer: Hydrologic- A. Producers only
- B. Producers and consumers
- C. All of these
- D. Consumers and decomposers
Explanation: Consumers return sulphur through wastes and remains, while decomposers mineralize organic sulphur into inorganic forms in the soil.
Correct answer: Consumers and decomposers- A. 75
- B. 65
- C. 85
- D. 95
Explanation: About 95% of Earth’s water is commonly represented in this classification as being bound in the lithosphere and sedimentary rocks, leaving…
Correct answer: 95- A. Tertiary productivity
- B. Secondary productivity
- C. Both (a) & (b)
- D. Net productivity
Explanation: Storage or production at a consumer trophic level is called secondary productivity, because consumers derive their biomass from consumed…
Correct answer: Secondary productivity- A. 28.6
- B. 26.8
- C. 22.6
- D. 22.8
Explanation: Lindemann’s trophic-transfer calculations give about 28.6% of net production as being passed on to carnivores in the stated relationship.
Correct answer: 28.6- A. 0.2-0.4
- B. 2?4
- C. 4?6
- D. 0.6-0.8
Explanation: Sugarcane is a highly productive crop, with net productivity commonly placed around 2–4 kg/m²/year.
Correct answer: 2?4- A. Producers less than herbivores
- B. Producers equal to herbivores
- C. Producers more than herbivores
- D. Variable
Explanation: In forests, a relatively small number of large producer trees can support numerous herbivores such as insects, so producers may be fewer…
Correct answer: Producers less than herbivores- A. Herbivore and detrivore
- B. Carnivore and detrivore
- C. Herbivore and carnivore
- D. All of these
Explanation: An omnivore consumes both plant material and animal matter, so it combines herbivore and carnivore feeding habits.
Correct answer: Herbivore and carnivore- A. Rhomboidal
- B. Inverted
- C. Linear
- D. Upright
Explanation: A biomass pyramid in a parasitic food chain is generally upright because the host organisms contain more total biomass than their…
Correct answer: Upright- A. Elton
- B. Kormondy
- C. Warming
- D. Clements
Explanation: Charles Elton introduced ecological pyramids, especially pyramids of numbers, to represent relationships between successive trophic…
Correct answer: Elton- A. Always temporary
- B. Either of these
- C. Always permanent
- D. Rarely permanent
Explanation: An ecosystem may be temporary, such as a newly formed pond, or relatively permanent, such as a mature forest.
Correct answer: Either of these- A. All of these
- B. Rhizopus and Riccia
- C. Ulothrix and Yeast
- D. Yeast and Monotropa
Explanation: Yeast and Monotropa are both non-photosynthetic organisms that obtain organic matter from other organisms, placing them at the consumer or…
Correct answer: Yeast and Monotropa- A. 112,887
- B. 118,872
- C. 181,872
- D. 112,788
Explanation: Lindemann’s classic energy-flow account gives the total solar input as approximately 118,872 gram-calories per square centimetre per year.
Correct answer: 118,872