Podcast
Questions and Answers
Why is energy needed for organisms, as described in the text?
Why is energy needed for organisms, as described in the text?
- To facilitate the transfer of carbon-based molecules.
- To directly stimulate cellular growth.
- To control the external environment of the organism.
- To prevent damage and breakdown through maintenance processes. (correct)
All organisms can use a single kind of nutritional process, irrespective of the complexity of carbon sources.
All organisms can use a single kind of nutritional process, irrespective of the complexity of carbon sources.
False (B)
What is the primary role of oxidizing-reducing reactions in the context of energy acquisition by organisms?
What is the primary role of oxidizing-reducing reactions in the context of energy acquisition by organisms?
to break down molecules
The process of acquiring oxygen from outside the body for the breakdown of food sources for cellular needs is known as ______.
The process of acquiring oxygen from outside the body for the breakdown of food sources for cellular needs is known as ______.
Match the following processes with their descriptions:
Match the following processes with their descriptions:
What primarily necessitates the need for a transportation system in multi-cellular organisms?
What primarily necessitates the need for a transportation system in multi-cellular organisms?
Waste by-products from chemical reactions are beneficial for the cells of the body and enhance their functionality.
Waste by-products from chemical reactions are beneficial for the cells of the body and enhance their functionality.
What is the fundamental requirement for life on Earth concerning the composition of food sources?
What is the fundamental requirement for life on Earth concerning the composition of food sources?
In multi-cellular organisms, specialized tissues for excretion require the transportation system to move ______ away from cells.
In multi-cellular organisms, specialized tissues for excretion require the transportation system to move ______ away from cells.
What is the final form of energy that the body converts varied external energy sources into?
What is the final form of energy that the body converts varied external energy sources into?
Single-celled organisms require specialized organs for taking in food and exchanging gases due to their limited surface area.
Single-celled organisms require specialized organs for taking in food and exchanging gases due to their limited surface area.
What must happen to external energy sources within the body before they can be utilized?
What must happen to external energy sources within the body before they can be utilized?
The increasing body size of an organism necessitates additional ______ from outside the organism.
The increasing body size of an organism necessitates additional ______ from outside the organism.
Match the following terms with their importance in maintaining life:
Match the following terms with their importance in maintaining life:
Why might simple diffusion be insufficient for meeting the requirements of all cells in multi-cellular organisms?
Why might simple diffusion be insufficient for meeting the requirements of all cells in multi-cellular organisms?
The environment of an organism is completely under its control, influencing the type of energy sources it can access.
The environment of an organism is completely under its control, influencing the type of energy sources it can access.
What is the purpose of converting external energy sources into a uniform energy source within the body?
What is the purpose of converting external energy sources into a uniform energy source within the body?
Specialized tissues in multi-cellular organisms facilitate the ______ of food and oxygen.
Specialized tissues in multi-cellular organisms facilitate the ______ of food and oxygen.
Which of the following is the primary reason for the development of specialized tissues in multi-cellular organisms?
Which of the following is the primary reason for the development of specialized tissues in multi-cellular organisms?
Match the following terms with their biological roles:
Match the following terms with their biological roles:
Flashcards
Nutrition
Nutrition
The process of transferring a source of energy (food) from outside the body to the inside.
Respiration
Respiration
The process of acquiring oxygen and using it to break down food sources for cellular needs.
Excretion
Excretion
The removal of waste by-products from the body after chemical reactions.
Transportation system
Transportation system
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Oxidising-reducing reactions
Oxidising-reducing reactions
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Study Notes
- Maintenance processes prevent damage and breakdown, requiring energy.
- This energy is obtained from outside the organism's body through a process called nutrition, using food as the energy source.
- Organisms require additional raw materials from external sources for body size growth.
- Life on Earth depends on carbon-based molecules, making most food sources carbon-based as well.
- Different organisms employ various nutritional processes based on the complexity of carbon sources.
- External energy sources vary and need to be broken down or built up in the body to be converted into a uniform energy source.
- This uniform energy source powers molecular movements for maintaining living structures and facilitates the creation of molecules needed for growth.
- A series of chemical reactions, including oxidising-reducing reactions, are necessary for these processes.
- Respiration is the process of acquiring oxygen from outside the body and using it to break down food sources for cellular needs.
Single-celled vs. Multi-cellular Organisms
- Single-celled organisms don't need specific organs for food intake, gas exchange, or waste removal because their entire surface is in contact with the environment.
- Multi-cellular organisms require specialized tissues because not all cells are in direct contact with the environment, and simple diffusion is insufficient.
- Multi-cellular organisms have specialized tissues for food and oxygen uptake
- This creates the need for a transportation system to carry food and oxygen throughout the body.
Waste Removal
- Chemical reactions using carbon and oxygen for energy generate by-products that can be harmful to cells.
- Excretion is the process of removing waste by-products from the body.
- Multi-cellular organisms develop specialized excretory tissues for waste removal.
- This also necessitates a transportation system to carry waste from cells to the excretory tissue.
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