Daily Current Affairs Quiz: February 28, 2026

1. Biorock technology is a method used to restore and regenerate damaged coral reefs.
2. It works by passing a low-voltage electrical current through submerged metal structures, which causes minerals like calcium carbonate to precipitate and form a solid substrate.
3. This substrate encourages coral larvae to settle and grow more quickly, strengthening reef ecosystems and helping them withstand stresses such as climate change and ocean acidification.

1. An oyster is a classic example of a filter feeder. It feeds by drawing in water and filtering out plankton and other microscopic organisms using its gills. This process not only sustains the oyster but also helps improve water quality in its habitat.
2. Catfish: They are bottom feeders, scavenging for food rather than filtering water.
3. Octopus: They are active predators, using tentacles and beaks to capture prey.
4. Pelican: They scoop fish with their large beaks, not by filtering water.

Biological Oxygen Demand (BOD) is a standard measure used to assess the level of organic pollution in water bodies. It indicates the amount of dissolved oxygen required by microorganisms to break down organic matter present in the water.

1. High BOD → Suggests heavy organic pollution (e.g., sewage, agricultural runoff), which can deplete oxygen and harm aquatic life.
2. Low BOD → Indicates cleaner water with less organic waste.

1. Diatoms are microscopic algae and serve as primary producers in aquatic ecosystems.
2. Crustaceans (like copepods and small shrimp) feed on diatoms, making them primary consumers.
3. Herrings are small fish that feed on crustaceans, acting as secondary consumers.

So the correct food chain sequence is:

1. Producers → Primary Consumers → Secondary Consumers
2. Diatoms → Crustaceans → Herrings

1. Mangroves are highly effective natural barriers against coastal hazards like tsunamis, storm surges, and coastal erosion.
2. Their dense, interlocking root systems trap sediments, stabilize shorelines, and absorb the energy of waves before they reach inland areas.