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Life Processes - WHA5.1 WHA5.1 WHA5.1 WHA5.1 WHA T ARE LIFE PROCESSES?T ARE LIFE PROCESSES?T ARE LIFE PROCESSES?T ARE LIFE PROCESSES?T ARE LIFE PROCESSES?

Grade 10CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Life processes are the basic functions performed by living organisms to maintain their life on Earth, including nutrition, respiration, transportation, and excretion.

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Energy is required for maintenance and repair of the body, which is obtained from food through the process of nutrition.

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Respiration is the process of acquiring oxygen from outside the body and using it in the process of break-down of food sources for cellular needs.

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In multicellular organisms, simple diffusion is insufficient to meet the oxygen requirements of all cells because all cells may not be in direct contact with the surrounding environment.

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Metabolism involves chemical reactions occurring within the body to maintain life, categorized into Anabolism (synthesis of complex substances) and Catabolism (breakdown of complex substances).

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Waste products generated during energy source utilization must be removed through a process called excretion to prevent toxicity.

📐Formulae

6CO2+12H2O→ChlorophyllSunlightC6H12O6+6O2+6H2O6CO_2 + 12H_2O \xrightarrow[\text{Chlorophyll}]{\text{Sunlight}} C_6H_{12}O_6 + 6O_2 + 6H_2O

C6H12O6+6O2→6CO2+6H2O+Energy (38 ATP)C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (38 ATP)}

C6H12O6→Cytoplasm2 Pyruvate+EnergyC_6H_{12}O_6 \xrightarrow{\text{Cytoplasm}} 2 \text{ Pyruvate} + \text{Energy}

C6H12O6→Lack of O22Lactic Acid+Energy (2 ATP)C_6H_{12}O_6 \xrightarrow{\text{Lack of } O_2} 2\text{Lactic Acid} + \text{Energy (2 ATP)}

C6H12O6→Absence of O22C2H5OH+2CO2+Energy (2 ATP)C_6H_{12}O_6 \xrightarrow{\text{Absence of } O_2} 2C_2H_5OH + 2CO_2 + \text{Energy (2 ATP)}

💡Examples

Problem 1:

Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

Solution:

In multicellular organisms, most cells are not in direct contact with the environment. Diffusion is a slow process; it is estimated that it would take 3 years for a molecule of O2O_2 to travel from our lungs to our toes by diffusion alone.

Explanation:

Complexity and size of multicellular organisms necessitate a dedicated transportation system (like blood) rather than relying on simple concentration gradients.

Problem 2:

What is the common energy currency for most cellular processes, and how much energy is released during its hydrolysis?

Solution:

The common energy currency is ATPATP (Adenosine Triphosphate). The hydrolysis of the terminal phosphate bond in ATPATP using water releases energy equivalent to 30.5 kJ/mol30.5\text{ kJ/mol}.

Explanation:

ATPATP is produced during respiration and used by the cell for various endothermic processes.

Problem 3:

During vigorous exercise, why do we experience muscle cramps?

Solution:

This is due to the accumulation of Lactic Acid (C3H6O3C_3H_6O_3). When oxygen is limited, glucose breaks down into pyruvate and then into lactic acid.

Explanation:

Anaerobic respiration in muscle cells produces less energy but allows for quick energy release at the cost of lactic acid buildup, which causes fatigue and cramps.