GK Express of 06/03/2026

🚆 GK Express 2.0

Discipline • Clarity • Competitive Preparation

TODAY’S FOCUS → INDIAN ENVIRONMENT AND BIO-DIVERSITY

🧠 Thought of the Day

“Nature provides a free lunch, but only if we control our appetites.”

— William Ruckelshaus

📰 Current Affairs

1. Cheetah Reintroduction Project Update: Wildlife experts at Kuno National Park report the birth of a new cub, indicating successful adaptation of African Cheetahs to Indian landscape and climate conditions.
2. US - Iran War: A US submarine torpedoed and sank the Iranian frigate IRIS Dena about 40 nautical miles off Sri Lanka’s southern coast near Galle in the Indian Ocean, bringing the US-Israel-Iran Conflict closer to the Indian Ocean Region (IOR) and marking the first US torpedo sinking of an enemy ship since World War II.
   
   Following the incident, Sri Lanka deployed naval vessels to rescue the sailors in line with its obligations under the International Convention on Maritime Search and Rescue (SAR Convention).

📘 Concept of the Day

Coastal Erosion in India

Why is this Topic Important?

India has a long coastline of about 7,500 km. Coastal erosion is a serious environmental and economic issue affecting many coastal states.

What is Coastal Erosion?

Coastal erosion is the gradual removal of soil, sand and rocks from the coastline due to natural forces like waves, tides and currents.

Erosion – wearing away of land by natural forces.
Tides – regular rise and fall of sea level.
Currents – continuous movement of ocean water.

Main Causes of Coastal Erosion

1. Natural Causes

• Strong sea waves and storms
• Cyclones
• Sea level rise due to global warming
• Tsunamis

2. Human Causes

• Construction of ports and harbours
• Sand mining
• Destruction of mangroves
• Unplanned coastal development
• Dams reducing sediment flow to coast

Sediment – sand and small particles carried by rivers to the sea.

Most Affected Areas in India

• West Bengal (Sundarbans)
• Odisha coast
• Tamil Nadu coast
• Kerala coast
• Gujarat coast

Impacts of Coastal Erosion

• Loss of land and property
• Damage to agriculture and fisheries
• Displacement of coastal communities
• Loss of biodiversity
• Threat to tourism

Simple Example

If a coastal village faces repeated strong waves during monsoon, the shoreline slowly moves backward, and houses near the sea may collapse due to land loss.

Government Measures

• Coastal Regulation Zone (CRZ) rules
• National Coastal Mission
• Construction of sea walls and groynes (structures built to reduce wave impact)
• Mangrove plantation
• Shoreline mapping by ISRO

Challenges

• Climate change increasing sea level
• Rapid urbanisation along coast
• Weak enforcement of CRZ rules
• High cost of protective infrastructure

Way Forward

• Integrated Coastal Zone Management (ICZM – coordinated planning of coastal areas)
• Restoration of mangroves and coral reefs
• Community participation
• Scientific coastal planning

Quick Revision

Strong waves + Sea level rise + Human interference → Coastal erosion → Land loss → Need for sustainable coastal management.

🤔 Think About This

Tap a question to reveal the answer

1. What are non-farm primary activities? How are these activities related to physiographic features in India? Discuss with suitable examples.

Introduction:
Primary activities are those that directly depend on natural resources. When these activities are not related to crop cultivation, they are called non-farm primary activities. Examples include fishing, forestry, mining, animal husbandry, and quarrying.

Examples of Non-Farm Primary Activities:

1. Animal Husbandry: Rearing cattle, sheep, goats, etc.

2. Fishing: Marine and inland fisheries.

3. Forestry: Collection of timber, bamboo, medicinal plants.

4. Mining and Quarrying: Extraction of coal, iron ore, bauxite, limestone, etc.

Relation with Physiographic Features of India:

1. Himalayan Region: Mountainous terrain and dense forests promote forestry and sheep rearing. Example: Apple orchards and wool production in Himachal Pradesh.

2. Northern Plains: Rivers support inland fisheries and dairy farming.

3. Peninsular Plateau: Rich in minerals; hence mining activities are common. Example: Iron ore mining in Odisha and Chhattisgarh.

4. Coastal Plains: Long coastline supports marine fishing. Example: Kerala and Gujarat are major fishing states.

5. Desert Regions: Arid climate supports camel rearing and sheep grazing in Rajasthan.

Conclusion:
Non-farm primary activities depend directly on natural conditions like relief, climate, soil, and mineral availability. India’s diverse physiography creates varied opportunities for such activities, contributing to regional economic development and livelihood diversification.

2. How does "Bio-magnification" differ from "Bio-accumulation"?

Introduction:
Both bio-accumulation and bio-magnification refer to the increase of harmful chemicals in living organisms. These chemicals are usually non-biodegradable, such as pesticides (DDT) and heavy metals (mercury).

Meaning:

Bio-accumulation: It is the gradual build-up of toxic substances in the body of a single organism over time.

Bio-magnification: It is the increase in concentration of toxic substances at each higher level of the food chain.

Key Differences:

Basis	Bio-accumulation	Bio-magnification
Level	Occurs within one organism	Occurs across food chain levels
Process	Chemical builds up faster than it is removed	Predators accumulate more toxins by eating prey
Example	Fish storing mercury in its body	Eagle having high DDT by eating contaminated fish

Example Explained:
If pesticide enters water, small fish absorb it (bio-accumulation). When bigger fish eat many small fish, the chemical level increases further. Birds eating those fish will have even higher concentration (bio-magnification).

Conclusion:
Thus, bio-accumulation happens within an organism, while bio-magnification occurs across the food chain. Both processes pose serious risks to ecosystems and human health.

📝 Let’s Write an Exam

Q.1 Which of the following is an example of an "In-situ" conservation method?

Botanical Garden

Zoological Park

Biosphere Reserve

Seed Bank

In-situ conservation involves protecting a species in its natural habitat. Examples include National Parks, Wildlife Sanctuaries, and Biosphere Reserves. Ex-situ involves protection outside the natural habitat (Zoos, Seed banks).

Q.2 The "Montreal Protocol" is a global agreement primarily focused on:

Reducing greenhouse gas emissions

Protection of transboundary wetlands

Phase-out of Ozone Depleting Substances (ODS)

Sustainable use of biological diversity

Signed in 1987, the Montreal Protocol aims to protect the ozone layer by phasing out substances like CFCs. It is widely regarded as one of the most successful environmental treaties.

✍️ Answer These Questions

1. What is the difference between a "National Park" and a "Wildlife Sanctuary" regarding human activity?

2. Name the phenomenon where a water body becomes overly enriched with minerals and nutrients, leading to excessive growth of algae.

📘 Answer Discussion

Q1. Restriction of Rights

In a National Park, no human activity or private ownership rights are allowed. In a Wildlife Sanctuary, certain limited human activities (like timber harvesting or grazing) may be permitted by the Chief Wildlife Warden as long as they don't interfere with animal welfare.

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Q2. Eutrophication

Eutrophication leads to "algal blooms" which deplete the oxygen in the water (BOD increases), eventually leading to the death of fish and other aquatic life.

GK Express @ Juniors Hostel
Curated with discipline by Nikhil Dasari