ICSE 10 Biology Pollution Short

headphones Listen to this note:
Speed: 1.0x

Table of Contents

    ⚡ Quick Revision: Pollution & Pollutants

    🔹 Types of Pollutants

    • ✔ Biodegradable: Pollutants that can be broken down by microorganisms (e.g., sewage, paper, vegetable waste).
    • ✔ Non-biodegradable: Pollutants that persist in the environment for a long time (e.g., DDT, Plastics, Glass, Heavy metals).

    🔹 Air Pollution: Key Factors

    • 1 Particulate Matter: Smoke, dust, and soot that cause respiratory issues like asthma and bronchitis.
    • 2 Gaseous Pollutants: $SO_2$ and $NO_x$ from burning fossil fuels, leading to Acid Rain.
    • 3 Carbon Monoxide (CO): Highly poisonous; combines with hemoglobin to form Carboxyhemoglobin, reducing $O_2$ transport.
    Term Card

    Pollution: Any undesirable change in the physical, chemical, or biological characteristics of air, water, and soil that harms living organisms.

    ❌ Don't Confuse:

    Natural Greenhouse Effect with Global Warming. The Greenhouse effect is necessary for life; Global Warming is the enhanced effect due to excessive $CO_2$ and $CH_4$ emissions.

    ⚡ Quick Revision: Water Pollution & its Effects

    🔹 Water Pollution Sources

    • ✔ Sewage: Domestic waste that causes water-borne diseases like cholera and typhoid.
    • ✔ Industrial Waste: Effluents containing toxic chemicals and heavy metals (Lead, Mercury).
    • ✔ Thermal Pollution: Hot water from power plants that reduces dissolved oxygen in water bodies.

    🔹 Major Environmental Impacts

    • 1. Eutrophication: Excessive nutrients (Nitrates/Phosphates) $\rightarrow$ Algal Bloom $\rightarrow$ Oxygen Depletion $\rightarrow$ Death of aquatic life.
    • 2. Biomagnification: Increase in the concentration of non-biodegradable toxins (like DDT) at each successive trophic level in a food chain.
    Biological Magnification of Toxins
    Term Card

    Minamata Disease: A neurological syndrome caused by severe mercury poisoning, first discovered in Japan due to industrial wastewater discharge.

    ❌ Don't Confuse:

    BOD (Biochemical Oxygen Demand). A high BOD indicates that the water is highly polluted because microorganisms are using up more oxygen to break down waste.

    ⚡ Quick Revision: Soil, Noise & Radiation

    🔹 Soil and Noise Pollution

    • ✔ Soil Pollution: Caused by excessive use of fertilizers/pesticides and dumping of solid waste (plastics, metal scrap).
    • ✔ Noise Pollution: Unwanted sound above 80 dB. Leads to hearing loss, hypertension, and loss of concentration.

    🔹 Radiation & Waste Management

    • ✔ Radiation: Leakage from nuclear plants (e.g., Chernobyl) causes genetic mutations and cancer.
    • ✔ The 3 Rs: Reduce (less consumption), Reuse (use again), and Recycle (reprocess).
    Term Card

    Incineration: The process of burning waste at high temperatures to reduce its volume and destroy pathogens.

    ❌ Exam Tip:

    Distinguish between Primary and Secondary pollutants. Primary (like $CO_2$) are emitted directly; Secondary (like Smog) form through reactions in the atmosphere.

    Older Posts