Science 7 Organism Quiz

Multicellular organisms are composed of more than one cell. This means that their bodies are made up of multiple cells that work together to perform various functions. Unlike unicellular organisms, which are made up of a single cell, multicellular organisms have specialized cells that are organized into tissues, organs, and systems. This allows them to carry out complex processes such as growth, reproduction, and response to stimuli. Multicellularity is a defining characteristic of higher organisms like plants, animals, and fungi.

Decomposers are organisms that obtain their food by breaking down the nutrients in dead animals or animal wastes. They play a crucial role in the ecosystem by breaking down organic matter and recycling nutrients back into the environment. Decomposers such as bacteria and fungi break down complex organic compounds into simpler forms that can be used by other organisms. This process of decomposition helps to maintain the balance of nutrients in the ecosystem and is essential for the recycling of organic matter.

The term "abiotic" refers to something that is dead or never was alive, meaning it does not possess the characteristics of being alive. This is the correct answer because the other options do not accurately define the term "abiotic."

The term "unicellular" refers to organisms that are composed of only one cell. This means that these organisms are made up of a single cell that carries out all of their life processes. They do not have specialized structures like organs or tissues, but instead, all of their functions are performed by this single cell. Examples of unicellular organisms include bacteria and protists.

An organism refers to a living thing that can carry out essential life processes such as reproduction, growth, and metabolism. It can be made up of a single cell (unicellular) or multiple cells (multicellular). Organisms can be classified as biotic, meaning they are living and derived from living matter. Autotrophs, on the other hand, are organisms that can produce their own food through processes like photosynthesis. Therefore, the term "organism" encompasses all these characteristics and is the most appropriate answer among the given options.

Organelles are specialized structures within a cell that carry out specific functions necessary for the cell's survival and life processes. These structures are responsible for various activities such as energy production, protein synthesis, and waste removal. Each organelle has a specific role and contributes to the overall functioning of the cell. Without organelles, cells would not be able to perform essential tasks and would not be able to maintain their characteristic functions. Therefore, the presence of organelles is crucial for the survival and proper functioning of cells.

The correct answer is "inhalation and exhalation of air." Respiration refers to the process of breathing, which involves the inhalation and exhalation of air. It is the mechanism by which organisms take in oxygen and release carbon dioxide, allowing for the exchange of gases necessary for cellular respiration. This process is essential for obtaining the energy needed to carry out the cell's life processes.

The word "characteristic" refers to a distinguishing trait or quality. It is a word used to describe a feature or attribute that is typical or unique to someone or something. In the context of the given options, "biotic," "photosynthesis," and "homeostasis" are all scientific terms related to living organisms and their processes. However, "characteristic" is a more general term that can be applied to a wide range of subjects, making it the correct answer.

Asexual reproduction is the correct answer because it involves the process of one cell splitting into two, with each new cell containing an identical copy of the DNA from the original cell. This process does not require the involvement of another organism and is commonly seen in unicellular organisms. Heterotrophs, biotic, and unicellular are not directly related to the given explanation.

Homeostasis refers to the ability of living organisms to maintain a stable internal environment despite changes in the external environment. This process involves various physiological mechanisms that regulate temperature, pH, and other vital parameters within a narrow range. By maintaining homeostasis, organisms can ensure optimal functioning of their cells and organs, allowing them to survive and adapt to different environmental conditions.

Heterotrophs are organisms that cannot produce their own food and instead rely on consuming other organisms or organic matter to obtain the energy and nutrients they need for survival. They are unable to perform photosynthesis or chemosynthesis like autotrophs, so they must take in food from their environment to meet their energy needs. This characteristic distinguishes heterotrophs from autotrophs in terms of their ability to obtain and utilize energy.

Reproduction refers to the natural process by which new individuals are generated and the species is perpetuated. It is the biological mechanism through which organisms produce offspring, ensuring the continuation of their species. Reproduction can occur through various methods, including sexual reproduction, which involves the fusion of gametes from two parents, and asexual reproduction, which involves the production of offspring without the involvement of gametes. Reproduction plays a crucial role in maintaining the genetic diversity and survival of a species.

The term "heredity" refers to the transmission of characteristics from one generation to the next. It involves the passing down of genetic information from parents to offspring, which determines the traits and features that an organism inherits. This process is responsible for the similarities and differences observed between individuals within a species.

The correct answer is "a large molecule in which heredity material is encoded." DNA is a molecule that contains the genetic instructions for the development, functioning, and reproduction of all known living organisms. It is composed of nucleotides and forms a double helix structure. DNA carries the genetic information that is passed down from parents to offspring, encoding traits and characteristics.

The term "biotic" refers to living organisms or factors that are associated with living organisms. In the context of the given options, "biotic" is the only term that directly relates to having life or being alive. "Abiotic" refers to non-living factors, "heredity" refers to the passing of traits from parents to offspring, and "metabolism" refers to the chemical processes that occur within living organisms. Therefore, "biotic" is the correct answer as it is the only option that pertains to living organisms.

The correct answer is the conversion of water and carbon dioxide into energy-rich substances such as sugars and starches. This is known as photosynthesis, a process in which plants and some other organisms use sunlight to convert water and carbon dioxide into glucose (sugar) and oxygen. This process is essential for the production of food and oxygen in the ecosystem.

Stimulus refers to a physical or chemical change in the internal or external environment that triggers a response in an organism. It can be any factor that provokes a reaction or behavior in an organism. In this context, stimulus is the correct answer as it is the only term that directly relates to the concept of a change in the environment leading to a response in an organism.

Metabolism refers to the sum of all the chemical reactions that occur in an organism. These reactions involve the transformation of energy and materials obtained from the environment. Metabolism encompasses processes such as digestion, respiration, and synthesis of molecules. It is responsible for converting food into energy, building and repairing cells, and eliminating waste products. Therefore, metabolism is the correct answer as it accurately describes the overall chemical reactions involved in energy and material transformation within an organism.

Autotrophs are organisms that can produce their own food using energy from sunlight or inorganic substances. They are able to convert this energy into organic compounds through the process of photosynthesis or chemosynthesis. Autotrophs play a crucial role in ecosystems as they are the primary producers, providing energy and nutrients for other organisms. In contrast, heterotrophs rely on consuming other organisms or organic matter to obtain energy. DNA and metabolism are not directly related to the question and do not specifically refer to organisms that make their own food.

The correct answer explains sexual reproduction as the process by which a new organism is formed with cells containing genetic information from both parents. This process involves the combination of genetic material from two parent organisms, resulting in offspring that inherit a complete set of hereditary information. This explanation accurately describes sexual reproduction and distinguishes it from other options such as energy conversion, environmental changes, and species perpetuation.