12.1.4 Benefits of Natural Substances Found in Water

This topic explains the beneficial substances found in natural water — those that are useful and necessary for life.

Definition

Some naturally occurring substances in water are useful and necessary for life.

Simple explanation: Not everything in water is harmful — some substances are essential for life.

Main Idea

The book lists two main categories of beneficial substances in natural water:

• Dissolved oxygen — essential for aquatic life
• Essential minerals — necessary for various biological processes

Simple explanation: Dissolved oxygen keeps fish alive; minerals like iron and zinc keep us healthy.

Core Concept

Detailed Explanation

1. Dissolved Oxygen

Existence of aquatic life depends on dissolved oxygen. This oxygen supports the respiration process of aquatic organisms.

• Fish, insects, and other aquatic organisms need oxygen to survive.
• Dissolved oxygen comes from:
• The atmosphere (oxygen dissolves in water at the surface)
• Photosynthesis by aquatic plants and algae
• Without dissolved oxygen, aquatic life cannot survive.

Simple explanation: Fish breathe oxygen dissolved in water — without it, they die.

2. Essential Minerals

Metal compounds in natural water can provide essential minerals needed for various biological processes.

Examples from the book:

• Necessary for the production of hemoglobin in the blood.
• Hemoglobin carries oxygen to the cells of our body.

Zinc (Zn), Copper (Cu), Manganese (Mn): - Activate enzyme activity for the proper functioning of biological systems.

Simple explanation: Minerals in water — like iron, zinc, copper, and manganese — are needed for important body functions.

Other Essential Minerals

Natural water can also provide:

Simple explanation: Many essential minerals come from the water we drink.

Intermediate Level

Why Dissolved Oxygen Is Important

• Aquatic organisms (fish, insects, plants) need oxygen to survive.
• Oxygen dissolves in water from the atmosphere and from photosynthesis by aquatic plants.
• If oxygen levels drop too low, fish and other organisms die.
• Cold water holds more dissolved oxygen than warm water.

Simple explanation: Fish need oxygen just like we do — they get it from dissolved oxygen in water.

Why Essential Minerals Are Important

• Needed for hemoglobin production.
• Hemoglobin carries oxygen in the blood.
• Iron deficiency → anemia (fatigue, weakness).

• Activates enzymes.
• Needed for immune function, wound healing, and growth.

• Activates enzymes.
• Needed for iron metabolism and connective tissue.

• Activates enzymes.
• Needed for bone formation and metabolism.

• Needed for bones and teeth.
• Important for muscle function and blood clotting.

• Needed for muscle and nerve function.
• Activates enzymes.

• Needed for nerve and muscle function.
• Maintains fluid balance.

• Maintains fluid balance.
• Needed for nerve function.

Simple explanation: Each mineral has a specific role in keeping the body healthy.

How Minerals Enter Natural Water

• Water flows over rocks and soil.
• Water dissolves minerals from the Earth's crust.
• This is why groundwater often contains more minerals than surface water.

Simple explanation: Water picks up minerals from rocks and soil as it flows.

Balanced View

• Beneficial substances — dissolved oxygen, essential minerals.
• Harmful substances — toxic metals, plastics, sewage, microbes, nitrates, phosphates.

• Keep beneficial substances (minerals).
• Remove harmful substances.

Simple explanation: Good water treatment keeps the good stuff and removes the bad stuff.

Important Points

• - Dissolved oxygen: supports respiration of aquatic organisms; essential for aquatic life.
• - Essential minerals: provide minerals needed for various biological processes.
• - Iron: necessary for hemoglobin production (carries oxygen in blood).
• - Zinc, copper, manganese: activate enzyme activity.
• - Calcium: bones and teeth.
• - Magnesium, potassium: muscle and nerve function.
• - Sodium: fluid balance.
• - Natural water contains both beneficial and harmful substances.
• - Water treatment keeps beneficial minerals while removing harmful substances.

Remember

• - Dissolved oxygen → keeps aquatic life alive.
• - Essential minerals → needed for health.
• - Iron → hemoglobin (blood).
• - Zinc, copper, manganese → enzymes.
• - Calcium → bones and teeth.
• - Magnesium, potassium → muscles and nerves.
• - Sodium → fluid balance.
• - Natural water = both beneficial and harmful substances.

Common Mistakes

• 1. Thinking all substances in water are harmful. Some are beneficial — like dissolved oxygen and essential minerals.
• 2. Thinking minerals in water are unnecessary. Minerals like iron, zinc, and calcium are essential for health.
• 3. Confusing the roles of different minerals. Iron → hemoglobin; zinc/copper/manganese → enzymes; calcium → bones.
• 4. Thinking dissolved oxygen is only for fish. It also supports other aquatic organisms (insects, plants, bacteria).
• 5. Forgetting that cold water holds more oxygen. Cold water has more dissolved oxygen than warm water.
• 6. Thinking water treatment removes all minerals. Good treatment keeps beneficial minerals while removing harmful substances.

Quick Revision

• Benefits of natural substances found in water:
• Iron: necessary for the production of hemoglobin in the blood, which carries oxygen to the cells of our body.
• Zinc, copper, and manganese: activate enzyme activity for the proper functioning of biological systems.
• Natural water contains both beneficial and harmful substances.
• Water treatment keeps beneficial minerals while removing harmful substances.

60-Second Revision

• Dissolved oxygen → keeps aquatic life alive.
• Essential minerals → needed for health.
• Iron → hemoglobin.
• Zinc, copper, manganese → enzymes.
• Calcium → bones and teeth.
• Warning: natural water contains both good and bad substances — treatment keeps the good, removes the bad.