📘 Daily General Science MCQs – Chapterwise Series 🧠
🔬 Chapter 4: Structural Organisation in Plants and Animals

Let’s try some questions on Morphology of Flowering Plants

NISAR Mission: A Landmark in Indo-US Space Collaboration 🤝

What is NISAR?

📌 NISAR stands for NASA-ISRO Synthetic Aperture Radar - the first Earth observation satellite jointly developed by ISRO and NASA.

📌 It uniquely carries dual-frequency radars: NASA’s L-band and ISRO’s S-band Synthetic Aperture Radars (SAR), enabling unprecedented imaging capabilities.

Launch Details

Date: July 30, 2025

Launch Vehicle: ISRO’s GSLV-F16 Mk II, marking the GSLV’s first mission to a Sun-synchronous polar orbit

Launch Site: Satish Dhawan Space Centre, Sriharikota

Mission Highlights & Capabilities

1. Advanced Imaging: NISAR can detect sub-centimetre surface changes, regardless of weather or lighting conditions

2. Global Monitoring: It will scan Earth’s land and ice surfaces every 12 days, delivering high-resolution data across multiple domains

3. Key Applications: Vital for tracking climate change (glaciers, ice sheets), disaster response (earthquakes, landslides, floods, volcanic activity), ecosystems, agriculture, and water resource shifts

Strategic & Technical Significance

1. Cost & Scale: With a mission value of approximately USD 1.5 billion, it’s the most costly Earth-imaging satellite ever built

2. Engineering Feat: The satellite employs two radars that must operate in harmony without interference - a remarkable technical integration

3. Diplomatic & Institutional Symbol: NISAR underscores the depth of Indo-US scientific cooperation, demonstrating India’s growing maturity in space technology

Key Takeaways for UPSC Aspirants

1. Climate & Disaster Management: NISAR’s high-resolution radar can monitor glaciers, forests, water bodies, and natural disasters like earthquakes, floods, and landslides - relevant for GS Paper-1 (Geography) and GS Paper-3 (Disaster Management)

2. Technological Advancement: Dual-frequency SAR (L-band by NASA + S-band by ISRO) marks a first-of-its-kind innovation, strengthening India’s space technology credentials under GS Paper-3 (Science& Tech)

3. Strategic Diplomacy: Symbolises Indo-US cooperation in advanced science - important for GS Paper-2 (International Relations) and Essay paper

4. Economic & Agricultural Relevance: Helps in crop monitoring, soil moisture mapping, and water resource management, linking to GS Paper-3 (Economy, Environment & Agriculture)

5. Environment & Climate Change: Direct applications in tracking deforestation, land-use changes, and polar ice melting - key for GS Paper-3 (Environment)

🦠 Rabies: A Fatal Yet Preventable Zoonotic Disease

What is Rabies?

🔹 A viral zoonotic disease caused by the Rabies virus (family Rhabdoviridae).
🔹 Affects the central nervous system (CNS), leading to progressive encephalitis.
🔹 Transmitted mainly through bites/scratches/saliva of infected animals (especially stray dogs, bats, cats).
🔹 Symptoms in dogs: aggression, excessive salivation (foaming), biting tendency, paralysis, and ultimately death.

Rabies in Humans: Is It Preventable?

🔹 YES — if treated immediately after exposure.
🔹 Post-Exposure Prophylaxis (PEP) includes:
✅ Immediate wound washing with soap and water or saline to reduce viral load at the source
✅ Rabies vaccine (series of doses) + Rabies Immunoglobulin (RIG) in severe cases (Category III bites) to neutralise the virus before it spreads
✅ Tetanus shot to prevent infection from soil-borne bacteria entering through the wound
⚠️ Once clinical symptoms appear (fever, tingling, hydrophobia, paralysis), rabies is almost always fatal.

🌍 Key Takeaways for UPSC Aspirants

🔹 Public Health: Rabies causes ~59,000 deaths annually worldwide, with India contributing ~1/3rd of global deaths.
🔹 Policy Link: National Action Plan for Rabies Elimination (NAPRE) aims to make India rabies-free by 2030 through the One Health approach (human + animal health).
🔹 Ethics & Essay relevance: Links to stray dog management, vaccination drives, and preventive healthcare.

🚗⚡ India Achieves E20 Blending Target!

📅 2025 Milestone: India has successfully rolled out E20 petrol (20% ethanol + 80% petrol) at fuel stations across the country — 5 years ahead of the original 2030 target.

🔹 Benefits of E20 Blending

• Energy Security: Cuts oil import dependence, saving foreign exchange.
• Environmental Gains: Lowers CO₂ emissions and improves air quality.
• Farmer Welfare: Expands market for sugarcane & surplus grains, boosting rural income.
• Green Economy: Supports India’s commitment to net-zero by 2070.

🚗 Issues in Vehicles & Ethanol Blending

1. Engine Compatibility & Efficiency
• Most vehicles on Indian roads are calibrated for E10 petrol.
• Concerns when such vehicles run on E20:
a) Mileage reduction: Fuel economy falls by 2-5% compared to E10.
b) Engine wear & corrosion: Ethanol is hygroscopic (absorbs water) → corrodes metals, degrades rubber/plastic parts (hoses, gaskets, seals).
c) Performance issues: Higher ethanol blends may cause cold start troubles, rough idling, and faster deterioration in older engines.

2. Flex-Fuel Vehicle (FFV) Readiness
• FFVs are specially designed to run smoothly on E0-E85 blends.
• Challenges FFVs face in India:
a) Engineering redesign: Stronger fuel lines, corrosion-resistant parts, and upgraded calibration are needed.
b) Higher cost of production: Automakers are reluctant without clear incentives.
c) Consumer hesitation: If fuel prices remain high and mileage drops, demand for FFVs may stay limited.

3. Consumer Concerns
• Price paradox: Ethanol blending does not guarantee lower petrol prices → consumers may end up paying more per km due to lower mileage.
• Warranty & reliability: Car/bike manufacturers are hesitant to provide warranty cover for ethanol-related engine damage.
• Awareness gap: Many consumers are unaware of ethanol compatibility requirements, leading to misuse of fuels in non-compatible engines.

🌍 UPSC Relevance

• Directly linked to Energy Security, Climate Commitments (Net Zero 2070), Farmer Welfare, and Technological Adaptation in the auto sector.
• Illustrates the policy-industry-consumer triangle in energy transition debates.

🧠🔥 Brain-Eating Amoeba Surge in Kerala

🔹 What is Brain-Eating Amoeba?

• Caused by Naegleria fowleri, a free-living amoeba found in warm freshwater (e.g., ponds, lakes, wells, unchlorinated pools).
• Leads to Primary Amoebic Meningoencephalitis (PAM) → rare but almost always fatal brain infection.
• Entry route: through the nose, when people swim/bathe or use contaminated water for nasal cleansing.
• ❌ Not spread by drinking water.

🔹 Treatment

• Miltefosine (an anti-parasitic drug) is being used in Kerala as part of a treatment cocktail along with other drugs like amphotericin B (an anti-fungal drug), early in the course of disease. This is helping improve survival significantly.

🔹 Symptoms in Humans

• Incubation: 1-12 days after exposure.
• Early: Headache, fever, nausea, vomiting.
• Progression: Neck stiffness, seizures, hallucinations, coma.
• Mortality: >95% once symptoms appear.

🔹 Prevention & Public Health Measures

✅ Avoid swimming/bathing in warm, stagnant/unclean water.
✅ Use boiled or sterilised water for nasal cleansing / ritual practices.
✅ Ensure proper chlorination of wells, tanks, and public baths.
✅ Early detection + rapid treatment is critical.

🌍 Key Takeaways for UPSC Aspirants

• Public Health: Highlights gaps in surveillance & water safety systems.
• One Health Approach: Links environment, water management, and human health.
• Climate Change Angle: Warming waters increase amoeba habitats → new health risks.
• Policy & Governance: Importance of awareness campaigns, water safety legislation, monitoring responsibilities, accountability.

🧪⚠️ Bromism & ChatGPT Health Advice — A Modern Cautionary Tale

🔹The Case: ChatGPT-Driven Bromide Poisoning

• A 60-year-old man replaced table salt with sodium bromide after ChatGPT suggested it as a “low-sodium alternative.”
• Result: Severe bromide toxicity and psychiatric symptoms.
• Doctors detected pseudohyperchloremia (false high chloride levels) — a diagnostic clue for bromism.

🔹 What is Bromism?

• Bromism is chronic bromide poisoning, caused by long-term intake of compounds like sodium bromide or potassium bromide.
• Historically used as sedatives & anticonvulsants, now discontinued due to neurotoxicity.
• Symptoms: Confusion, hallucinations, fatigue, tremors, paranoia, speech or coordination problems — due to central nervous system (CNS) depression.

🔹 Why This Matters for UPSC Aspirants

• Health & Technology: Illustrates risks when AI tools are used for self-medication without medical oversight.
• Ethics & Governance: Need for regulation and safe boundaries for AI in health sectors.
• Policy Link: Frameworks on telemedicine and digital health (e.g., Telemedicine Practice Guidelines of 2020 and Digital Information Security in Healthcare Act of 2018 (DISHA)), and AI ethics must address such misuse.

🧴⚖️ Fake ORS Controversy: Public Health vs Misleading Marketing

📅 Background

• October 2025: The Food Safety and Standards Authority of India (FSSAI) banned the use of the term “ORS” (Oral Rehydration Solution) on any food or beverage not matching the WHO UNICEF approved formulation.
• This action followed an 8-year-long campaign by Dr Sivaranjani Santosh, a Hyderabad paediatrician, who exposed misleading “ORS” drinks being sold as medical-grade rehydration solutions.

💧 The Problem

• True ORS is a medical formulation used to replace lost water and electrolytes in diarrhoea.
• It must have precise proportions of:
🧂 Sodium chloride
⚡ Potassium chloride
🍬 Sodium citrate
🍚 Dextrose (glucose)
❌ Fake ORS / energy drinks contained:
• Excess sugar (up to 10x more) and very low electrolytes.
• This creates a hyperosmotic solution, pulling more water into the intestines instead of absorbing it — thus worsening dehydration and diarrhoea instead of curing it.
• In children, this can be life-threatening due to rapid fluid and sodium loss.

⚖️ Regulatory & Legal Developments

• 🧾 FSSAI Directive (Oct 2025): Banned any use of “ORS” in brand names, prefixes, or suffixes unless WHO standards are met.
• ⚖️ Delhi High Court (Oct 2025): Granted interim protection to JNTL Consumer Health (maker of “ORSL”), citing the need for due process before enforcement.
• This case reflects the balance between public health protection and commercial trademark rights.

🌍 Key Takeaways for UPSC Aspirants

1. Public Health Policy: Demonstrates how inaccurate food labelling can endanger lives
2. Governance & Activism: Shows how citizen-led efforts can influence national regulatory change.
3. Law & Ethics: Involves conflict between health safety and corporate branding rights.
4. Science & Medicine: True ORS must maintain osmotic balance; excess sugar without electrolytes exacerbates diarrhoea.
5. Essay / GS 4: Case study in ethical governance, persistence, and public interest advocacy.