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 40 of 85
- A. Saprophytes
- B. Primary consumers
- C. Second trophic level
- D. None of these
Explanation: Snakes are not fixed at one trophic level because their position depends on their prey; they may act as secondary or tertiary consumers.
Correct answer: None of these- A. Herbivores levels
- B. Consumer levels
- C. Producer levels
- D. Trophic levels
Explanation: The feeding or nutritional positions in an ecosystem are called trophic levels.
Correct answer: Trophic levels- A. Primary consumers
- B. Producers
- C. Secondary consumers
- D. Disinfectants
Explanation: Producers contain the greatest energy because they capture solar energy and form the base of the energy pyramid.
Correct answer: Producers- A. T3
- B. T2
- C. T1
- D. T4
Explanation: The first trophic level, T1, consists of producers such as green plants, which capture solar energy.
Correct answer: T1- A. Flow of energy
- B. Cycling of material
- C. Consumption of materials
- D. Flow of energy and cycling of materials
Explanation: An ecosystem is characterized by one-way flow of energy and repeated cycling of materials between biotic and abiotic components.
Correct answer: Flow of energy and cycling of materials786. Ecosystem contains:
- A. All of the above
- B. Consumers
- C. Decomposers
- D. Producers
Explanation: A complete ecosystem includes producers, consumers, and decomposers along with abiotic factors.
Correct answer: All of the above- A. Only two types of organisms
- B. Only bacteria and fungi
- C. Only microscopic animals
- D. Only two types of organisms plus macroscopic animals
Explanation: In the standard ecological classification, decomposers are chiefly microorganisms such as bacteria and fungi that chemically break down…
Correct answer: Only bacteria and fungi- A. Phagocytosis
- B. Food web
- C. Symbiosis
- D. Food chain
Explanation: A food chain shows the direct sequence of organisms in which one eats another, transferring energy upward.
Correct answer: Food chain- A. Biosphere
- B. Decomposers
- C. Consumers and decomposers
- D. Producers
Explanation: The biosphere is the global zone containing life and all ecosystems, so it collectively includes the living organisms found in them.
Correct answer: Biosphere- A. Straight
- B. Inverted
- C. Horizontal
- D. Indefinite
Explanation: A tree may support many herbivorous insects and other consumers, so one large producer is represented by numerous organisms at the next…
Correct answer: Inverted- A. Producers and consumers
- B. Producers and decomposers
- C. Producers, consumers and decomposers
- D. Producers and light
Explanation: Biological equilibrium results from interacting controls among producers, consumers and decomposers, including energy flow and nutrient…
Correct answer: Producers, consumers and decomposers- A. Microconsumers
- B. Secondary consumers
- C. Primary consumers
- D. None of these
Explanation: Bacteria are commonly classified as microconsumers because they obtain nutrients by decomposing organic matter and absorbing dissolved…
Correct answer: Microconsumers- A. Detrivores
- B. Herbivores
- C. Carnivores
- D. Omnivores
Explanation: Primary consumers feed directly on producers such as green plants, making them herbivores.
Correct answer: Herbivores- A. Net primary productivity
- B. Gross secondary productivity
- C. Gross primary productivity
- D. Net secondary productivity
Explanation: Gross primary productivity is the total rate at which producers convert light energy into chemical energy through photosynthesis.
Correct answer: Gross primary productivity- A. Primary carnivore and trophic level II
- B. Secondary consumers and herbivores
- C. Primary consumers and herbivores
- D. Trophic level I and herbivores
Explanation: Primary consumers feed directly on producers, so they are herbivores and occupy trophic level II.
Correct answer: Primary consumers and herbivores- A. Fe
- B. P
- C. Mg
- D. Ca
Explanation: Phosphorus can be carried into ocean sediments and become unavailable for rapid biological recycling, making it a critical limiting…
Correct answer: P- A. Oxygen and nitrogen
- B. Phosphorus and CO2
- C. Phosphorus and Sulphur
- D. Phosphorus and nitrogen
Explanation: Sedimentary cycles have their main reservoirs in rocks and sediments; phosphorus and sulphur are the standard examples.
Correct answer: Phosphorus and Sulphur- A. 25%
- B. 50%
- C. 10%
- D. 5%
Explanation: Only about 10% of the energy at one trophic level is typically transferred to the next, with the remainder lost mainly as heat and through…
Correct answer: 10%- A. Place of occurrence
- B. Competitive ability
- C. Centre of origin
- D. Function at its place of occurrence
Explanation: A habitat describes where a species lives, whereas its niche describes how it lives, including its role and function in the ecosystem.
Correct answer: Function at its place of occurrence- A. All the above
- B. Electrification of nitrogen
- C. Industries
- D. Biological nitrogen fixation
Explanation: Nitrogen enters ecosystems through biological fixation, lightning, and industrial processes such as fertilizer production.
Correct answer: All the above