Biology ยท Environmental Studies

Ecosystem Nutrition and Energy Flow

1,235 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 source of food for most coral reef organisms?

  1. Plankton

  2. Seaweed

  3. Coral polyps

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

Plankton, microscopic organisms suspended in the water column, serve as the primary food source for a vast majority of coral reef organisms. These tiny creatures provide essential nutrients and energy to various marine life forms.

Multiple choice

What is the primary food source for most coral reef fish?

  1. Phytoplankton

  2. Zooplankton

  3. Algae

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

Zooplankton, tiny drifting animals, are the primary food source for most coral reef fish.

Multiple choice

What is the term for the practice of avoiding or reducing the consumption of meat and animal products?

  1. Vegetarianism

  2. Veganism

  3. Pescetarianism

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

Veganism is the practice of avoiding or reducing the consumption of all animal products, including meat, dairy, eggs, and honey.

Multiple choice

Which of the following is NOT a component of nutrient cycling?

  1. Decomposition

  2. Nitrogen Fixation

  3. Photosynthesis

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

Photosynthesis is a process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen. It is not a component of nutrient cycling.

Multiple choice

What is the primary source of food for organisms in coastal and marine ecosystems?

  1. Sunlight

  2. Organic matter from land

  3. Phytoplankton

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

Phytoplankton are microscopic algae that form the base of the food web in coastal and marine ecosystems.

Multiple choice

Which of the following is NOT a primary producer in marine ecosystems?

  1. Phytoplankton

  2. Seaweed

  3. Coral

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

Coral, while an important component of marine ecosystems, is not a primary producer as it relies on symbiotic relationships with photosynthetic organisms for sustenance.

Multiple choice

What is the primary diet of the Malabar Gliding Frog?

  1. Insects

  2. Fruits

  3. Seeds

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

The Malabar Gliding Frog primarily feeds on insects.

Multiple choice

What is the ecological role of freshwater invertebrates in aquatic ecosystems?

  1. Primary producers

  2. Secondary consumers

  3. Decomposers

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

Freshwater invertebrates play various ecological roles, including primary production through photosynthesis (e.g., some aquatic insects), secondary consumption of organic matter, and decomposition of dead organisms.

Multiple choice

What is the primary food source for freshwater mussels?

  1. Algae

  2. Bacteria

  3. Detritus

  4. Small aquatic insects
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Freshwater mussels are filter feeders, primarily consuming bacteria and other microorganisms suspended in the water.

Multiple choice

Which of the following is the primary source of food for humans?

  1. Plants

  2. Animals

  3. Fungi

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

Plants are the primary source of food for humans, as they provide the majority of the calories and nutrients that we need to survive.

Multiple choice

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

  1. They serve as primary producers

  2. They are top predators

  3. They decompose organic matter

  4. They are herbivores
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Freshwater fungi play a crucial role in aquatic food webs by breaking down organic matter and making it available to other organisms.

Multiple choice

What is the primary mode of nutrition in freshwater fungi?

  1. Photosynthesis

  2. Saprophytic absorption

  3. Parasitic absorption

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

Freshwater fungi primarily obtain nutrients through saprophytic absorption, breaking down organic matter and absorbing nutrients.

Multiple choice

What is the role of freshwater fish in the food chain?

  1. Prey for Larger Predators

  2. Top Predators

  3. Primary Producers

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

Freshwater fish primarily serve as prey for larger predators, such as birds, mammals, and other fish, in the aquatic food chain.

Multiple choice

Which keystone species is known for its role in maintaining coral reef ecosystems?

  1. Sea otter

  2. African elephant

  3. Coral trout

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

Coral trout are keystone species in coral reef ecosystems, as they prey on herbivorous fish that would otherwise overgraze corals. Their presence helps maintain the health and diversity of coral reefs.

Multiple choice

Which keystone species is known for its role in maintaining the structure and stability of kelp forests?

  1. Sea otter

  2. African elephant

  3. Polar bear

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

Sea otters are keystone species in kelp forests, as they prey on sea urchins that would otherwise overgraze kelp. Their presence helps maintain the health and diversity of kelp forests.