Gr 8 Natural Sciences Ch 1.2: Feeding relationships
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Questions and Answers

What is the primary source of energy for producers?

  • Dead organisms
  • Sunlight (correct)
  • Insects
  • Meat

Which group of organisms breaks down dead or decaying organisms?

  • Producers
  • Decomposers (correct)
  • Herbivores
  • Consumers

What is an organism that eats both plants and animals called?

  • Insectivore
  • Omnivore (correct)
  • Carnivore
  • Herbivore

What is the by-product of photosynthesis?

<p>Oxygen (D)</p> Signup and view all the answers

Which type of organism forms the base of the food chain?

<p>Producers (B)</p> Signup and view all the answers

What is the general equation for photosynthesis?

<p>Carbon Dioxide + Water → Glucose + Oxygen (D)</p> Signup and view all the answers

What do producers use to synthesize their own food?

<p>All of the above (D)</p> Signup and view all the answers

Which type of consumer eats primarily insects?

<p>Insectivore (C)</p> Signup and view all the answers

What type of consumer is a cow?

<p>Herbivore (A)</p> Signup and view all the answers

What is the role of decomposers in an ecosystem?

<p>To break down dead or decaying matter (B)</p> Signup and view all the answers

What type of consumer is a hawk in a food chain?

<p>Quaternary consumer (D)</p> Signup and view all the answers

What is the main difference between a food chain and a food web?

<p>Food chains depict a single pathway, while food webs depict multiple pathways (B)</p> Signup and view all the answers

What happens to energy as it is transferred from one trophic level to the next?

<p>It is lost as heat (A)</p> Signup and view all the answers

What is the role of predators in an ecosystem?

<p>To regulate population sizes (B)</p> Signup and view all the answers

What type of consumer is a bear?

<p>Omnivore (A)</p> Signup and view all the answers

What is the primary function of insectivores in an ecosystem?

<p>To control insect populations (B)</p> Signup and view all the answers

What is an example of a biotic component in a pond ecosystem?

<p>Fish (C)</p> Signup and view all the answers

What is the result of energy loss at each trophic level?

<p>Energy decreases (A)</p> Signup and view all the answers

What is the primary function of producers in an ecosystem?

<p>To form the base of the food chain and supply energy to consumers (C)</p> Signup and view all the answers

What is the main difference between a carnivore and an omnivore?

<p>A carnivore eats only meat, while an omnivore eats both plants and animals (D)</p> Signup and view all the answers

What is the ultimate source of energy for consumers in an ecosystem?

<p>Producers (D)</p> Signup and view all the answers

What is the role of herbivores in an ecosystem?

<p>To consume producers for energy (D)</p> Signup and view all the answers

What is the primary function of decomposers in an ecosystem?

<p>To recycle nutrients back into the ecosystem (D)</p> Signup and view all the answers

What is the result of energy flow in an ecosystem?

<p>Energy is lost at each trophic level (C)</p> Signup and view all the answers

What is the significance of producers in carbon and oxygen cycling?

<p>They produce oxygen and absorb carbon dioxide (C)</p> Signup and view all the answers

What is the role of consumers in an ecosystem?

<p>To obtain energy by consuming other organisms (A)</p> Signup and view all the answers

What is the primary function of herbivores in an ecosystem?

<p>To transfer energy from producers to higher trophic levels (A)</p> Signup and view all the answers

What is the characteristic of omnivores in terms of their position in the food chain?

<p>They can occupy multiple trophic levels (D)</p> Signup and view all the answers

What is the primary reason for the limitation of trophic levels in an ecosystem?

<p>The energy loss at each trophic level (B)</p> Signup and view all the answers

What is the role of decomposers in maintaining ecosystem health?

<p>To recycle nutrients and support ecosystem health (B)</p> Signup and view all the answers

What is the benefit of food webs over food chains?

<p>They provide a more accurate representation of ecosystem complexity (C)</p> Signup and view all the answers

What is the significance of predator-prey relationships in ecosystems?

<p>They help regulate population sizes and maintain ecosystem balance (C)</p> Signup and view all the answers

What is the primary characteristic of a food chain?

<p>It is a linear sequence of energy and nutrient flow (D)</p> Signup and view all the answers

What is the result of the recycling of nutrients by decomposers?

<p>The availability of essential nutrients for producers (B)</p> Signup and view all the answers

What is the primary function of carnivores in an ecosystem?

<p>To feed on other animals, transferring energy from one trophic level to the next (D)</p> Signup and view all the answers

What is the characteristic of a pond ecosystem?

<p>It is an aquatic ecosystem with interactions between biotic and abiotic components (A)</p> Signup and view all the answers

What is the primary function of producers in an ecosystem?

<p>To synthesize their own food from inorganic substances (A)</p> Signup and view all the answers

What is the ultimate source of energy for consumers in an ecosystem?

<p>Sunlight (B)</p> Signup and view all the answers

What is the primary role of decomposers in an ecosystem?

<p>To recycle nutrients back into the ecosystem (C)</p> Signup and view all the answers

What is the characteristic of consumers in an ecosystem?

<p>They cannot produce their own food and must obtain energy by consuming other organisms (B)</p> Signup and view all the answers

What is the significance of producers in carbon and oxygen cycling?

<p>They release oxygen and absorb carbon dioxide (B)</p> Signup and view all the answers

What is the flow of energy in an ecosystem?

<p>From producers to consumers (B)</p> Signup and view all the answers

What is the result of energy transfer from one trophic level to the next?

<p>Energy is lost as heat (D)</p> Signup and view all the answers

What is the primary function of herbivores in an ecosystem?

<p>To consume plants for energy (D)</p> Signup and view all the answers

What is the primary function of herbivores in an ecosystem?

<p>To transfer energy stored in plants to higher trophic levels (B)</p> Signup and view all the answers

What is the main difference between a food chain and a food web?

<p>A food chain is a simpler representation of feeding relationships, while a food web is more complex (C)</p> Signup and view all the answers

Why do ecosystems typically have a pyramidal energy structure?

<p>Because energy is lost as heat at each trophic level (D)</p> Signup and view all the answers

What is the role of insectivores in an ecosystem?

<p>To help control insect populations and serve as prey for higher-level carnivores (D)</p> Signup and view all the answers

What is the result of the continuous recycling of nutrients by decomposers?

<p>The availability of essential nutrients for producers (C)</p> Signup and view all the answers

What is the significance of predator-prey relationships in ecosystems?

<p>They help regulate the population of herbivores and maintain balance in ecosystems (D)</p> Signup and view all the answers

What is the primary characteristic of a food chain?

<p>It is a linear sequence of energy transfer from one organism to another (B)</p> Signup and view all the answers

What is the role of omnivores in an ecosystem?

<p>To occupy multiple trophic levels and play a flexible role in food webs (C)</p> Signup and view all the answers

What is the primary function of carnivores in an ecosystem?

<p>To control the population of herbivores and maintain balance in ecosystems (C)</p> Signup and view all the answers

What is the benefit of food webs over food chains?

<p>Food webs provide a more accurate representation of the complexity of feeding relationships in ecosystems (C)</p> Signup and view all the answers

Which type of consumer has the most flexible role in a food web?

<p>Omnivore (A)</p> Signup and view all the answers

What is the primary reason for the limitation of trophic levels in an ecosystem?

<p>Energy loss at each trophic level (C)</p> Signup and view all the answers

What is the significance of decomposers in maintaining ecosystem health?

<p>They recycle organic matter, returning nutrients to the soil (C)</p> Signup and view all the answers

What is the characteristic of a food web that distinguishes it from a food chain?

<p>It illustrates the interconnectedness of various food chains (C)</p> Signup and view all the answers

What is the primary function of producers in an ecosystem?

<p>To provide energy to consumers (C)</p> Signup and view all the answers

What is the result of energy transfer from one trophic level to the next?

<p>Energy is lost as heat at each trophic level (B)</p> Signup and view all the answers

What is the significance of predator-prey relationships in ecosystems?

<p>They control the populations of herbivores (B)</p> Signup and view all the answers

What is the primary function of insectivores in an ecosystem?

<p>To regulate the insect population (D)</p> Signup and view all the answers

What is the characteristic of a pyramidal energy structure in an ecosystem?

<p>Energy decreases as you move up the trophic levels (C)</p> Signup and view all the answers

What is the primary role of decomposers in nutrient cycling?

<p>To release nutrients back into the soil (C)</p> Signup and view all the answers

What is the primary function of producers in an ecosystem, other than producing their own food?

<p>To form the base of the food chain and supply energy to other organisms. (C)</p> Signup and view all the answers

What is the consequence of energy loss at each trophic level in an ecosystem?

<p>A reduction in the energy available to organisms at the next trophic level. (C)</p> Signup and view all the answers

What is the significance of producers in carbon and oxygen cycling?

<p>They produce oxygen as a by-product of photosynthesis and absorb carbon dioxide from the atmosphere. (A)</p> Signup and view all the answers

What is the primary characteristic of a carnivore in an ecosystem?

<p>It primarily eats other animals. (A)</p> Signup and view all the answers

What is the role of decomposers in maintaining ecosystem health?

<p>To break down dead or decaying organisms and recycle nutrients. (D)</p> Signup and view all the answers

What is the primary difference between a food chain and a food web?

<p>A food chain is a complex network of trophic interactions, while a food web is a linear sequence of trophic levels. (B)</p> Signup and view all the answers

What is the ultimate source of energy for consumers in an ecosystem?

<p>Producers, through the process of photosynthesis. (C)</p> Signup and view all the answers

What is the primary characteristic of an ecosystem with a pyramidal energy structure?

<p>Energy is lost at each trophic level, resulting in a decrease in energy availability. (B)</p> Signup and view all the answers

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