Problem 9 - Objective Biology for NEET

Question

The role of water in our body is to (a) Act as medium for transport of substances (b) Provide medium for all metabolic reactions (c) Prevent dehydration of body (d) All of these

Step-by-Step Solution

Answer

The correct answer is (d) All of these.

Step 1: Understand the Role of Water for Transport

Water indeed acts as a medium for the transport of substances. Nutrients and wastes move through the body dissolved in water. Hence option (a) is correct.

Step 2: Understand Water as a Medium for Metabolic Reactions

Water is not just necessary for life, it is central to all biological processes, including metabolic reactions. It functions as a solvent for chemical reactions in our bodies. Therefore, option (b) is also correct.

Step 3: Understand Water's Role in Preventing Dehydration

Water is vital for maintaining hydration and electrolyte balance in the body. Without enough water, a person can become dehydrated, leading to a range of health issues. So, choice (c) is also correct.

Step 4: Make the Final Choice

Given that all of the above options (a, b, and c) are proper roles of water in the body, we can conclude that option (d) - 'All of these', is the correct answer to this exercise.

Key Concepts

Transport of Substances

Water is essential when it comes to moving various substances around the body. Imagine it as the highway system for nutrients and waste products, carting them to and from different parts of your body. Nutrients from the food you eat need to reach your cells, and waste products generated need to be excreted. Water dissolves these substances, making it easier to transport them through the bloodstream.

• Nutrients: Things like vitamins and glucose are transported to cells dissolved in water.
• Wastes: Metabolic byproducts are moved to the kidneys for excretion.

Without water, the transportation of these substances would be inefficient. This is why staying hydrated is critical to ensure all bodily functions operate smoothly.

Metabolic Reactions

Metabolic reactions are the chemical processes that occur within living organisms to maintain life. Water is crucial for these reactions because it acts as a solvent. Most biochemical reactions in the body occur in an aqueous environment.

• Catalysis: Enzymes require water to function effectively and catalyze reactions.
• Hydrolysis: Water assists in breaking down complex molecules into simpler ones.

Consider water as the venue where all the body's chemical reactions take place. Without it, these reactions would grind to a halt, severely impacting your health. Water doesn't just support these reactions; it is often directly involved in the chemical changes happening inside your body.

Prevention of Dehydration

Dehydration occurs when the body loses more water than it takes in. This imbalance can affect the body's normal operations, leading to serious health problems if neglected. Water is the best defense against dehydration.

• Body Temperature: Water helps regulate and maintain body temperature through perspiration.
• Electrolyte Balance: Essential for nerve function and muscle contractions.

When you're hydrated, your body can function optimally, your skin stays healthy, and physical performance is supported. Remember, maintaining adequate water intake is key to preventing dehydration and ensuring your body operates at its best.