12 Questions
What is the process of acquiring oxygen from outside the body for cellular needs?
Respiration
What is the primary source of energy for organisms?
Food sources from outside the body
Why do organisms need to break down food sources into a uniform source of energy?
To facilitate molecular movements
What is the result of the body's inability to control its environment?
Energy sources are varied and unpredictable
What is the relationship between the size of an organism and its nutritional needs?
Larger organisms require more nutrition
What is the purpose of oxidation-reduction reactions in the body?
To break down molecules for energy
Why do single-celled organisms not need specific organs for exchanging gases and removing waste?
Because they are in direct contact with the environment
What is the result of chemical reactions that use carbon sources and oxygen for energy generation?
The creation of harmful by-products for the cells
What is the main reason for the development of a transportation system in multi-cellular organisms?
To provide oxygen and nutrients to all parts of the body
What is the process by which waste by-products are removed from the body and discarded outside?
Excretion
Why do all the cells in a multi-cellular organism not receive the necessary nutrients and oxygen through simple diffusion?
Because the cells are not in direct contact with the environment
What is the main difference between single-celled and multi-cellular organisms in terms of their body design?
Multi-cellular organisms have a more complex body design
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.
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.
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