Biology ยท Environmental Studies

Ecosystem Nutrition and Energy Flow

1,093 Questions

Ecosystem nutrition and energy flow questions cover trophic levels, food chains, and biodegradable materials. These concepts frequently appear in general science sections of major competitive exams. Review these questions to build a solid understanding of ecological interactions.

Trophic levels conceptFood chain orderAutotrophic nutritionEnergy assimilationScavengers and decomposers

Ecosystem Nutrition and Energy Flow Questions

Multiple choice

What is the primary reservoir for Salmonella?

  1. Humans

  2. Animals (e.g., poultry, cattle)

  3. Water

  4. Soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salmonella primarily resides in animals, particularly poultry and cattle, and can be transmitted to humans through contaminated food products.

Multiple choice

What is the ecological significance of freshwater protozoa in aquatic food webs?

  1. They serve as primary consumers, feeding on bacteria and other microorganisms.

  2. They are secondary consumers, feeding on primary consumers and other small organisms.

  3. They are tertiary consumers, feeding on secondary consumers and larger organisms.

  4. They are decomposers, breaking down organic matter and releasing nutrients back into the environment.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Freshwater protozoa occupy the position of primary consumers in aquatic food webs. They feed on bacteria, algae, and other small microorganisms, converting them into energy and biomass that can be passed up the food chain to higher trophic levels.

Multiple choice

What are some of the ways in which the interdependence of existence can be expressed?

  1. Through the food chain.

  2. Through the water cycle.

  3. Through the carbon cycle.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The interdependence of existence can be expressed in many ways, including through the food chain, the water cycle, and the carbon cycle.

Multiple choice

What is the primary feed source for organic livestock?

  1. Genetically modified crops

  2. Conventional feed grains

  3. Organic feedstuffs

  4. Animal by-products
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Organic livestock are fed organic feedstuffs, which are produced without the use of synthetic fertilizers, pesticides, or genetically modified organisms (GMOs).

Multiple choice

What is the term used to describe the practice of growing food in a symbiotic system with fish?

  1. Hydroponics

  2. Aeroponics

  3. Aquaponics

  4. Vertical farming
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aquaponics is a system that combines aquaculture (raising fish) and hydroponics (growing plants in water) in a symbiotic environment.

Multiple choice

What was the primary diet of most sauropods?

  1. Meat

  2. Plants

  3. Insects

  4. Fish
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sauropods were herbivores.

Multiple choice

What is the primary producer in most coastal and marine ecosystems?

  1. Phytoplankton

  2. Zooplankton

  3. Fish

  4. Sea turtles

  5. Marine mammals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phytoplankton are microscopic plants that are the primary producers in most coastal and marine ecosystems.

Multiple choice

What is the primary role of producers in an ecosystem?

  1. Decompose organic matter

  2. Consume other organisms

  3. Synthesize organic compounds from inorganic matter

  4. Regulate the flow of energy through the ecosystem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Producers, such as plants and algae, use photosynthesis or chemosynthesis to convert inorganic molecules into organic compounds, providing the foundation of the food chain.

Multiple choice

Which of the following is an example of a decomposer?

  1. Bacteria

  2. Fungi

  3. Earthworms

  4. Hawks
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteria are decomposers that break down dead organisms and organic matter, releasing nutrients back into the ecosystem.

Multiple choice

What is the primary source of food for a significant portion of the world's population?

  1. Marine ecosystems

  2. Agricultural systems

  3. Forest ecosystems

  4. Grassland ecosystems
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Agricultural systems, supported by ecosystems, provide the majority of the food consumed by humans worldwide.

Multiple choice

Which of the following is NOT a type of human diet?

  1. Omnivorous

  2. Herbivorous

  3. Carnivorous

  4. Frugivorous
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Humans are not carnivorous, as they consume both plant and animal foods.

Multiple choice

What is the primary source of food for a majority of the world's population?

  1. Agriculture

  2. Hunting

  3. Fishing

  4. Gathering
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Agriculture is the primary source of food for most of the world's population, as it involves the cultivation of crops and the raising of livestock for food production.

Multiple choice

What is the term used to describe the process by which energy and nutrients flow through an ecosystem?

  1. Food chain

  2. Food web

  3. Trophic level

  4. Ecological pyramid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A food web is a complex network of interconnected food chains, showing how energy and nutrients flow through an ecosystem.

Multiple choice

Which of the following is an example of a producer organism?

  1. Grass

  2. Lion

  3. Bacteria

  4. Mushroom
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Grass is an example of a producer organism, which is an organism that can produce its own food through photosynthesis or chemosynthesis.

Multiple choice

What is the term used to describe the practice of feeding livestock a diet that is high in energy and low in fiber?

  1. Concentrate feeding

  2. Roughage feeding

  3. Pasture-based feeding

  4. Organic feeding
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Concentrate feeding is the practice of feeding livestock a diet that is high in energy and low in fiber. This type of diet can lead to increased methane emissions from livestock, as the rumen microorganisms responsible for fermentation produce more methane when fed a high-energy diet.