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Questions and Answers
What is the process of acquiring oxygen from outside the body for cellular needs?
What is the process of acquiring oxygen from outside the body for cellular needs?
What is the primary source of energy for organisms?
What is the primary source of energy for organisms?
Why do organisms need to break down food sources into a uniform source of energy?
Why do organisms need to break down food sources into a uniform source of energy?
What is the result of the body's inability to control its environment?
What is the result of the body's inability to control its environment?
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What is the relationship between the size of an organism and its nutritional needs?
What is the relationship between the size of an organism and its nutritional needs?
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What is the purpose of oxidation-reduction reactions in the body?
What is the purpose of oxidation-reduction reactions in the body?
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Why do single-celled organisms not need specific organs for exchanging gases and removing waste?
Why do single-celled organisms not need specific organs for exchanging gases and removing waste?
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What is the result of chemical reactions that use carbon sources and oxygen for energy generation?
What is the result of chemical reactions that use carbon sources and oxygen for energy generation?
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What is the main reason for the development of a transportation system in multi-cellular organisms?
What is the main reason for the development of a transportation system in multi-cellular organisms?
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What is the process by which waste by-products are removed from the body and discarded outside?
What is the process by which waste by-products are removed from the body and discarded outside?
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Why do all the cells in a multi-cellular organism not receive the necessary nutrients and oxygen through simple diffusion?
Why do all the cells in a multi-cellular organism not receive the necessary nutrients and oxygen through simple diffusion?
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What is the main difference between single-celled and multi-cellular organisms in terms of their body design?
What is the main difference between single-celled and multi-cellular organisms in terms of their body design?
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Study Notes
Energy and Nutrition
- Energy comes from outside the body of an individual organism through food, which is a carbon-based source.
- Nutrition is the process of transferring energy from outside the body to the inside.
Growth and Development
- For an organism to grow, additional raw materials are needed from outside the body.
- The complexity of an organism determines the type of nutritional process it uses.
Energy Sources
- The outside sources of energy are varied and come from the environment.
- Energy sources need to be broken down in the body and converted to a uniform source of energy for molecular movements.
Chemical Reactions
- Oxidising-reducing reactions are used to break down molecules.
- Many organisms use oxygen sourced from outside the body for these reactions.
Respiration
- Respiration is the process of acquiring oxygen from outside the body to break down food sources for cellular needs.
Simple and Complex Organisms
- In single-celled organisms, the entire surface is in contact with the environment, so no specific organs are needed for taking in food, exchanging gases, or removing waste.
- In multi-cellular organisms, not all cells are in direct contact with the environment, so specialized tissues are needed for these functions.
Specialized Tissues
- Specialized tissues are responsible for the uptake of food and oxygen.
- These tissues are organized in the body to perform specific functions.
Transportation System
- A transportation system is needed to carry food and oxygen from one place to another in the body.
- This system is necessary because food and oxygen are taken up at one place in the body, but all parts of the body need them.
Excretion
- Chemical reactions create by-products that are useless and potentially harmful to the body.
- Excretion is the process of removing these waste by-products from the body and discarding them outside.
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Description
Learn about the process of nutrition and how organisms obtain energy from outside sources. Understand the importance of carbon-based molecules in food and how they relate to the growth of an organism.
