#1 . Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
#2 What criteria do we use to decide whether something is alive?
#3 What are outside raw materials used for by an organism?
#4 What processes would you consider essential for maintaining life?
Answers
Answered by
69
1ans :-
In multicellular organisms like humans the body design is very complex and the oxygen demand is quite high. The oxygen requirements of an animal cannot be met by the process of diffusion as diffusion is a very slow process.
To overcome this, multicellular organisms have specialized cells and tissues for performing various necessary functions of the body such as intake of oxygen and food. This helps for the higher animals like humans to meet the sufficient oxygen requirement. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion simply cannot meet their oxygen requirements.
2ans:-
Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not.
3ans:-
Various outside raw materials used by an organism are as follows:
1) Food as source of supplying energy and materials.
2) Oxygen for breakdown of food to obtain energy.
3) Water for proper digestion of food and other functions inside the body.
The raw materials required by an organism will vary depending on the complexity of the organism and its environment.
4ans :-
Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for maintaining life.
In multicellular organisms like humans the body design is very complex and the oxygen demand is quite high. The oxygen requirements of an animal cannot be met by the process of diffusion as diffusion is a very slow process.
To overcome this, multicellular organisms have specialized cells and tissues for performing various necessary functions of the body such as intake of oxygen and food. This helps for the higher animals like humans to meet the sufficient oxygen requirement. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion simply cannot meet their oxygen requirements.
2ans:-
Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not.
3ans:-
Various outside raw materials used by an organism are as follows:
1) Food as source of supplying energy and materials.
2) Oxygen for breakdown of food to obtain energy.
3) Water for proper digestion of food and other functions inside the body.
The raw materials required by an organism will vary depending on the complexity of the organism and its environment.
4ans :-
Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for maintaining life.
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Answered by
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1) In multicellular organisms like humans, all the body cells are not in direct contact with the surrounding environment . Thus , every cell of the body will not get oxygen by the process of diffusion . Therefore diffusion is insufficient to meet the oxygen requirements of multicellular organisms .
2) The main criteria used to decide whether something is alive are breathing and respiration . However , living beings also show growth and movement .
3) Any organism uses organic molecules as raw material and oxygen for respiration . Heteroptrophs use food and autotrophs use carbon dioxide , minerals & water .
4) The prrocesses essential for maintaining life are :-
• Nutrition
• Respiration
• Transportation
• Excretion
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