Sustainability and Ecosystem

What is sustainability?

• The ability to generate renewable energy

• The ability to meet the needs of the present without compromising the ability of future generations to meet their own needs.

• The process of recycling materials

• The ability to maintain suitable living conditions for a community

Answer explanation

Sustainability is best defined as the ability to meet the needs of the present without compromising the ability of future generations to meet their own needs. While all options touch upon aspects of sustainability, the correct answer focuses on maintaining suitable living conditions for a community, which is a component of the definition but not the entire concept.

In an ecosystem food is

Answer explanation

In an ecosystem, food is indeed essential. Ecosystems consist of various organisms that depend on food for survival. This food comes from different sources, such as plants (for herbivores) and other animals (for carnivores and omnivores). Without food, the organisms would not be able to survive, thus disrupting the balance of the ecosystem.

What are producers?

• Organisms that can make their own food

• Organisms that rely on other organisms for food.

• Organisms that only eat meat.

• Organisms that live in water.

Answer explanation

Producers are organisms that can make their own food, often through a process known as photosynthesis. They do not rely on other organisms for food nor are they restricted to a carnivorous diet or to living in water. The term 'producers' generally refers to plants, algae, and some bacteria which transform sunlight into a usable form of energy.

What are consumers?

• Organisms that eat other organisms as their source for food

• Organisms that obtain energy by consuming inorganic matter.

• Organisms that obtain energy through photosynthesis.

• Organisms that obtain energy by consuming only plants.

Answer explanation

Consumers, in biology, are organisms that rely on others for food, rather than producing their own through photosynthesis or consuming inorganic matter. The correct option is 'Organisms that eat other organisms as their source for food', which succinctly defines the term 'consumers' in the context of the question.

What is this formula for?

• Photosynthesis.

• Circumference of a circle.

• Predator and Prey.

• Chemical reaction of a bushfire.

Answer explanation

The formula mentioned in the question is related to photosynthesis. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities. The other options: circumference of a circle, predator and prey, and chemical reaction of a bushfire, do not align with the formula provided in the question.

Glucose is produced during photosynthesis. True or False?

• True

• False

Answer explanation

The statement is correct. During photosynthesis, plants take in carbon dioxide and water, and under the influence of sunlight, they produce glucose and oxygen. Glucose is used as a primary source of energy by the plant.

In this food chain the snake doesn't have a food source without what?

• Snake

• Soil

• Frog

• Grass

Answer explanation

In the given food chain, if we remove the frog, the snake, which is a higher order predator, will not have a food source. This is because the frog is a direct prey of the snake. Without frogs, the snake's survival becomes difficult as it loses a major food source.

Explain what a food web is. Use this diagram.

Define decomposers.

• Organisms that consume dead or decaying organic matter.

• Organisms that produce dead or decaying organic matter.

• Organisms that convert dead or decaying organic matter into energy.

• Organisms that break down dead or decaying organic matter

Answer explanation

Decomposers are organisms that break down dead or decaying organic matter. They don't consume or convert it into energy, nor do they produce it. Instead, they perform a vital role in ecosystems by recycling nutrients back into the soil, which enhances its fertility and supports new life. This process sets them apart from other types of organisms.

In the process of one organism eating another, some energy is lost. True or False?

• False

• True

Answer explanation

The statement in the question is correct. In the process of one organism eating another, some energy is lost. This happens because energy transfer in a food chain is not completely efficient, and some energy is always lost as heat during metabolic processes.