Question

Give all answers please...​

Answer 1

A•1) Diffusion is unable to meet the oxygen requirements of multi-cellular organisms such as humans because diffusion is one of the slow processes. ... Besides, in humans oxygen requirement is more at cellular and tissue level. Therefore, through diffusion, it becomes difficult for oxygen to reach all the cells.

A•2) 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.

A•3) Various outside raw materials used by an organism are as follows: → Food as source of supplying energy and materials. → Oxygen for breakdown of food to obtain energy.

A•4) In humans and other vertebrates, there are certain processes which are considered critical for sustaining life. These include respiration, nutrition, digestion, excretion, reproduction and metabolism.

Answer 2

$\bf\huge{Questions \:with \:answers:-}$

$\bf{1.}$ Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

$\bf{Answer:-}$ The process of diffusion is not sufficient to meet the oxygen requirement of multicellular organisms lije humans because :

• In multicellular organisms, all the cells are not in direct contact with the environment so they cannot acquire oxygen from their surrounding through the process of diffusion.
• They have a complex body design with specialised organs to perform specific functions, oxygen has to be supplied to each cell of the tissue and organs to help them function efficiently.

$\bf{2.}$ What criteria do we use to decide whether something is alive?

$\bf{Answer:-}$ The criteria that we need to observe to decide whether something is alive are —

• If it is breathing.
• If it is exhibiting some kind of growth.
• If it shows some physical movement, even if invisible to the naked eye.
• If its molecules display movement.
• If it performs the life processes of nutrition, respiration, transportation, excretion, etc.

$\bf{3.}$ What are outside raw materials used for by an organism?

$\bf{Answer:-}$ The outside raw materials used by an organism, and their purposes are—

• Food : Provides energy to the body to perform different functions.
• Oxygen : Stimulates energy for classification and dispersal of food sources.
• Water : Acts as medium for smooth functioning of various processes in the body. e.g. digestion.
• Minerals : Provides energy for carrying out different processes of the body.

$\bf{4.}$ What processes would you consider essential for maintaining life ?

$\bf{Answer:-}$ The processes essential for maintaining life are nutrition, respiration, transportation, movement and excretion.

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