📘 Daily General Science MCQs – Chapterwise Series 🧠
🔬 Chapter 3: Classification of Organisms

Let’s try some more questions on Kingdom Plantae

🚀 Axiom-4 Mission (Ax-4)

🔹 Overview:
• Private space mission to the International Space Station (ISS), organised by Axiom Space (USA).
• Launched on 25 June 2025 via SpaceX Falcon 9 rocket carrying Crew Dragon capsule ‘Freedom’.
• Mission duration: 18 days, splashdown on 15 July 2025.

🔹 Significance:
• Part of a growing trend of commercial human spaceflights – NASA, Axiom, SpaceX collaboration.
• Demonstrates how private-public partnerships are shaping the future of space exploration.

🔹 Relevance to India/ISRO:
• First time Indian-designed experiments were conducted onboard a commercial ISS mission.
• Seven Indian microgravity experiments sponsored by ISRO and industry, including:
1. Microalgae in space – food, oxygen, biofuel potential
2. Seed germination (Moong and Methi) – space agriculture
3. Tardigrade survival
4. Myogenesis – muscle cell growth
5. Cyanobacteria in microgravity

🔹 UPSC Themes:
• Role of ISRO in global space research
• Microgravity experiments – implications for long-term space missions
• Example of space diplomacy and Indo–US scientific collaboration
• Boost to India’s preparation for Gaganyaan mission

👨‍🚀 Group Captain Shubhanshu Shukla

• Indian Air Force (IAF) test pilot, trained astronaut.
• Selected for Gaganyaan mission by ISRO; trained in India and Russia.
• Flew on Ax-4 as Mission Pilot, becoming:
1. First Indian to visit the ISS
2. First Indian to visit the ISS via a commercial/private mission
3. Second Indian in space after Rakesh Sharma (1984)

Development of indigenous multi-stage Malaria vaccine 'AdFalciVax' is underway

Read more about Malaria from the PMF IAS General Science Book: https://amzn.to/4gorSrU

📌 Earth’s Second-Shortest Day This Summer

• On July 22, 2025, Earth’s rotation will quicken, shaving approximately 1.34 milliseconds off the standard 24 hour day, making it the second shortest day ever recorded.

🕰️ Why Is This Happening?

1. Moon’s gravitational tug – When the Moon reaches its extreme northern or southern latitudes (part of its 18.6 year cycle), its pull reduces tidal drag, speeding up Earth's spin.
2. Atmospheric & core dynamics – Fluctuations in wind patterns and molten core movement offer additional torque that influences spin rates.

🔧 Why It Matters

• These millisecond shifts are critical for precise systems like GPS, telecoms, and financial networks, which rely on exact timing — even tiny variations require adjustments.
• Global agencies are considering the first-ever negative leap second (i.e., subtracting a second) around 2029, to realign atomic time (UTC) with Earth’s rotation.

🌍 Key Takeaways for UPSC Aspirants

• Earth Moon dynamics: Tidal interactions influence Earth’s rotation and, by extension, our timekeeping.
• Technological impact: These microvariations demand updates in global time standards and infrastructure.
• Geo climatic linkage: Earth's internal and atmospheric processes interplay with celestial mechanics to produce measurable changes.