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## Compare the functioning of alveoli in the lungs

[question] Question. Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning. [solution] solution: [/solution]...

## What are the differences between the transport

[question] Question. What are the differences between the transport of materials in xylem and phloem? [/question] [solution] solution: [/solution]...

## What is the role of acid

[question] Question. What is the role of acid in our stomach ? [/question] [solution] solution: Hydrochloric acid (HCl) is component of gastric juice. It has five functions, (i) Softening of food, (ii) Conversion of pepsinogen and prorennin into active forms of pepsin and rennin (iii) Acidify the food for proper action of pepsin. (iv) Killing of microoganisms present in food. (v) Stoppage of action of salivary amylase. [/solution]...

## Where does the plants get each of the

[question] Question. Where does the plants get each of the raw materials for photosynthesis ? [/question] [solution] solution: (i) Carbon Dioxide - Air through stomata. (ii) Water - Soil through roots. (iii) Minerals - Soil through roots [/solution]...

## What are the difference between autotrophic

[question] Question. What are the difference between autotrophic nutrition and heterotrophic nutrition ? [solution] solution: Autotrophic nutrition : The process through which organisms are able to build up their own organic food from raw materials which are obtained from outside, in the form of carbon dioxide and water in the presence of chlorophyll and sunlight. The organisms having autotrophic mode of nutrition or can make their own food are called autotrophs or autotrophic organisms. e.g. Gr...

## What processes would you consider

[question] Question. What processes would you consider essential for maintaining life ? [/question] [solution] solution: Life processes nutrition, metabolism, respiration, exchange of materials, transportation, excretion and awareness. [/solution]...

## What are outside raw materials

[question] Question. What are outside raw materials used by an organism ? [/question] [solution] solution: Food by heterotrophic organisms ; carbon dioxide, minerals and water by autotrophic organisms ; oxygen by all aerobic organisms. [/solution]...

## What criteria do we use to decide

[question] Question. What criteria do we use to decide whether something is alive ? [/question] [solution] solution: The major criterion which is used to decide whether something is alive is movements. Movements may be that of locomotion (e.g. running of dog), movement of a part (e.g. chewing cud by cow), breathing movements, growth movements (in plants) and movement of molecules in metabolic reactions, maintenance and repair of cellular structures. Besides movements, other criteria found in liv...

## Why is diffusion insufficient to meet the oxygen requirements

[question] Question. Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans? [/question] [solution] solution: Every living cell requires oxygen for performing cellular respiration. In unicellular organisms (e.g., Amoeba), the single cell is in direct contact with environment. Oxygen passes into it through diffusion. In simple multicellular organisms (e.g. Hydra), every cell may also take oxygen through diffusion from environment. This is not possibl...

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