10th Grade Biology Ecosystems Quiz | Food Chains 20 Questions with Answers

Explanation: An energy pyramid shows how energy decreases as it moves up the food chain. Only a small percentage of energy is transferred from one level to the next.

Explanation: A top predator is an organism that is at the highest level of the food chain and has no natural predators. Lions hunt other animals but are rarely hunted themselves.

Explanation: Every food chain begins with producers because they are the only organisms that can directly capture energy from the Sun. This energy is then passed on to consumers when they eat plants or other animals.

Explanation: A food chain shows a simple and direct path of energy transfer from one organism to another. In this example, energy moves from grass to deer and then to lion in a straight line.

Explanation: Decomposers such as bacteria and fungi break down dead organisms into simpler substances. This process returns important nutrients back to the soil, which helps plants grow and keeps the ecosystem balanced.

Explanation: Producers are organisms like plants and algae that can make their own food through a process called photosynthesis. They use sunlight, water, and carbon dioxide to produce energy-rich food, which becomes the main energy source for all other organisms in the ecosystem.

Explanation: Marine ecosystems exist in saltwater environments such as oceans and seas. They include organisms like fish, whales, coral, and plankton.

Explanation: Humans are omnivores, meaning they eat both plants and animals. While humans cannot make their own food like plants, they consume producers and consumers, placing them at multiple levels of the food chain.

Explanation: A food web shows how different food chains are linked together in an ecosystem. It gives a more realistic picture of feeding relationships because most organisms eat more than one type of food.

Explanation: Herbivores depend completely on plants for food. Animals like deer, cows, and rabbits are herbivores. They are also known as primary consumers because they eat producers.

Explanation: Abiotic factors are non-living parts of the environment. Water, sunlight, temperature, and soil are all examples of abiotic factors that affect living organisms.

Explanation: Mushrooms are decomposers and do not need sunlight to make food. They get energy by breaking down dead organic matter.

Explanation: The Sun is the primary source of energy for nearly all ecosystems. Plants capture sunlight during photosynthesis and convert it into chemical energy, which then flows through the food chain.

Explanation: Producers have the most energy because they receive energy directly from the Sun. As energy moves up the food chain, a large amount is lost as heat, so higher levels have less energy available.

Explanation: Energy decreases at each higher level of the food chain because organisms use most of the energy for growth, movement, and survival. Only a small portion of energy is passed on.

Explanation: Secondary consumers eat primary consumers. Since snakes often eat animals like rabbits that feed on plants, they are classified as secondary consumers.

Explanation: An ecosystem includes all living organisms such as plants, animals, and microorganisms along with non-living components like air, water, sunlight, soil, and temperature. These parts interact with each other and depend on one another to survive. Without both living and non-living components working together, an ecosystem cannot function properly.

Explanation: Producers are the foundation of every ecosystem. Without them, energy cannot enter the food chain. As a result, consumers and decomposers would eventually die due to lack of food.

Explanation: Decomposers return nutrients from dead plants and animals back to the soil. This allows producers to reuse those nutrients and keeps the ecosystem functioning smoothly.

Explanation: Plants absorb carbon dioxide from the atmosphere during photosynthesis. This helps regulate the amount of carbon dioxide in the air and supports life on Earth.