Life processes(Nutrition)
Question 1:
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
AnswerMulticellular organisms such as humans possess complex body designs. They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion cannot meet their oxygen requirements.
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
AnswerMulticellular organisms such as humans possess complex body designs. They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion cannot meet their oxygen requirements.
Question 2:
What criteria do we use to decide whether something is alive?
Answer
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.
What criteria do we use to decide whether something is alive?
Answer
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.
Question 3:
What are outside raw materials used for by an organism?
Answer
An organism uses outside raw materials mostly in the form of food and oxygen. The raw materials required by an organism can be quite varied depending on the complexity of the organism and its environment.
Answer
An organism uses outside raw materials mostly in the form of food and oxygen. The raw materials required by an organism can be quite varied depending on the complexity of the organism and its environment.
Question 4:
What processes would you consider essential for maintaining life?
Answer
Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for
maintaining life.
What processes would you consider essential for maintaining life?
Answer
Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for
maintaining life.
Internal questions.
Question 1:
What are the differences between autotrophic nutrition and heterotrophic nutrition?
Answer
What are the differences between autotrophic nutrition and heterotrophic nutrition?
Answer
Question 2:
Where do plants get each of the raw materials required for photosynthesis?
Answer
The following raw materials are required for photosynthesis:
Where do plants get each of the raw materials required for photosynthesis?
Answer
The following raw materials are required for photosynthesis:
- The raw material CO2 enters from the atmosphere through stomata.
- Water is absorbed from the soil by the plant roots.
- Sunlight, an important component to manufacture food, is absorbed by the chlorophyll and other green parts of the plants.
Question 3:
What is the role of the acid in our stomach?
Answer
The hydrochloric acid present in our stomach dissolves bits of food and creates an acidic medium. In this acidic medium, enzyme pepsinogen is converted to pepsin, which is a protein-digesting enzyme.
What is the role of the acid in our stomach?
Answer
The hydrochloric acid present in our stomach dissolves bits of food and creates an acidic medium. In this acidic medium, enzyme pepsinogen is converted to pepsin, which is a protein-digesting enzyme.
Question 4:
What is the function of digestive enzymes?
Answer
Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body.
What is the function of digestive enzymes?
Answer
Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body.
Question 5:
How is the small intestine designed to absorb digested food?
Answer
The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food absorption. Within these villi, many blood vessels are present that absorb the digested food and carry it to the blood stream. From the blood stream, the absorbed food is delivered to each and every cell of the body.
How is the small intestine designed to absorb digested food?
Answer
The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food absorption. Within these villi, many blood vessels are present that absorb the digested food and carry it to the blood stream. From the blood stream, the absorbed food is delivered to each and every cell of the body.
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