Daily Quiz 07 April 2026

Answer: D
Explanation:
Statement 1 is incorrect: Sargassum in the GASB is holopelagic, meaning it is free-floating and never attaches to the seabed. It reproduces vegetatively on the ocean surface, unlike other seaweeds that have a benthic (bottom-dwelling) stage.
Statement 2 is correct: While Sargassum has existed for centuries (e.g., in the Sargasso Sea), the GASB is a 21st-century phenomenon. Scientists first observed this distinct, massive belt forming in 2011, likely due to shifting ocean currents and increased nutrient runoff.
Statement 3 is correct: Nutrient enrichment from major river discharges—specifically the Amazon, Orinoco, and Mississippi—provides the nitrogen and phosphorus that fuel these unprecedented blooms. Upwelling of nutrients off the coast of West Africa also plays a role.
Statement 4 is correct: When massive mats of Sargassum wash ashore and rot, they release hydrogen sulfide and ammonia, which are toxic and cause respiratory issues. Furthermore, as they decompose, they release methane and carbon dioxide, contributing to greenhouse gas emissions.

Answer: C

Explanation:

• Statement 1 is correct: A fundamental objective of the strategy is to achieve a high-resolution understanding of the marine environment. This involves comprehensive mapping of seabed topography, temperature, salinity, and other oceanographic parameters to support both scientific research and naval operations.
• Statement 2 is correct: By creating a “transparent” underwater environment, the strategy significantly enhances submarine detection capabilities. The integration of acoustic data from underwater sensors allows the Chinese navy to track the “acoustic signatures” of foreign vessels, effectively challenging the stealth of traditional submarines.
• Statement 3 is incorrect: While the South China Sea is a primary focus, the strategy is not limited to that region. It is a global ambition that extends into the Western Pacific, the Indian Ocean, and even the Arctic (often referred to as the “Polar Silk Road”), aiming for global maritime situational awareness.

Statement 4 is correct: The technical backbone of the strategy involves the large-scale deployment of fixed subsea monitoring systems (like the “Underwater Great Wall”), autonomous underwater vehicles (AUVs), and satellite-linked ocean sensors to provide real-time data from the seabed to space.

Answer: A

Explanation:

• Statement 1 is correct: The fossils date back roughly 20 million years, placing them in the Early Miocene epoch (part of the Neogene Period).
• Statement 2 is incorrect: These are actually micro-fossils, typically smaller than 5 mm (not 5 cm). They are so tiny they were identified while sifting through sediment.
• Statement 3 is correct: The presence of these specific filter-feeding snails (a turritelline-dominated assemblage) indicates ocean upwelling. This process, where deep, cold, nutrient-rich water rises to the surface, supports an abundant and productive marine ecosystem along the ancient Dwarka coastline.
• Statement 4 is correct: These “microscopic time capsules” allow scientists to reconstruct past marine ecosystems, map shifting ocean currents, and understand how marine life responded to global climatic changes long before human influence. 

Answer: B

Explanation:

• Statement 1 is incorrect: Under the Constitution (Scheduled Castes) Order, 1950, SC status is not independent of religion. It is strictly limited to individuals professing Hinduism, Sikhism, or Buddhism.
• Statement 2 is correct: The Court ruled that a person converting to a religion outside the specified three (such as Christianity or Islam) cannot claim SC status or protections under the SC/ST (Prevention of Atrocities) Act, as these faiths are theoretically viewed as “caste-less” under law.
• Statement 3 is correct: Scheduled Tribe (ST) status is determined by tribal identity and customs rather than religion. An ST individual who converts to another religion typically retains their status as long as they maintain their tribal way of life and community acceptance.

Statement 4 is incorrect: The Court held that SC status is lost “immediately and completely” from the moment of conversion. There is no gradual diminishing of status; all statutory benefits and protections terminate automatically upon the act of conversion.

Answer: A

Explanation:

• Statement 1 is correct: NAMs are designed to use human-relevant systems—such as human cells, tissues, and computer models—to predict how the human body will respond to a drug. This addresses the “species gap” where animal results often fail to translate to humans.
• Statement 2 is correct: Organ-on-a-chip (OoC) systems are a type of NAM that uses microfluidic technology. These are tiny, clear chips containing human cells that mimic the physiological environment and functional response of entire organs like the heart, liver, or lungs.
• Statement 3 is incorrect: While growing rapidly, NAMs are not yet universally standardised. Regulatory agencies like the US FDA and India’s CDSCO are still developing frameworks to validate these methods. Many pharmaceutical companies still rely on animal testing due to existing legal requirements and a lack of harmonized global protocols.

Statement 4 is correct: By identifying toxic or ineffective drugs much earlier in the cycle, NAMs can significantly reduce development time and costs. They help prevent expensive failures during human clinical trials, which currently have a high “attrition rate.”