Tag: science & technology

The sinoatrial (SA) node initiates each heartbeat by generating electrical impulses that spread through the heart's conduction system, earning it the 'pacemaker' designation. The AV node delays impulses, Purkinje fibers conduct them to ventricles, and endocardium is the heart's inner lining.

Darwinian fitness specifically measures an organism's reproductive success - how many viable offspring it produces that contribute genes to the next generation's gene pool. Health and environmental stability are factors that might influence fitness, but not the measure itself. Genetic recombination is a mechanism, not a fitness metric.

Broccoli and cauliflower are cruciferous vegetables rich in sulforaphane and other compounds that studies suggest have cancer-preventive properties. They contain antioxidants and glucosinolates that support cellular health. This statement is scientifically supported.

High intake of animal fat is associated with increased cancer risk, while plant fiber has protective effects. Eating more animal fat and less fiber would increase, not decrease, cancer risk according to current nutritional science.

The small intestine is the longest section of the digestive tube, typically 6-7 meters in adults. It includes duodenum, jejunum, and ileum. The stomach is a J-shaped organ, large intestine is about 1.5 meters, and esophagus is approximately 25cm.

Wernicke's area, located in the left temporal lobe, is responsible for language comprehension. Damage causes receptive aphasia - patients can speak fluently but cannot understand language. Broca's area handles speech production, not comprehension.

The Dhruv helicopter (option B) is an indigenous Indian helicopter developed by HAL that has been exported to several countries including Nepal, Ecuador, and Peru. It's a multi-role utility helicopter known for its reliability in high-altitude operations. The BrahMos and Prithvi are missiles, while Saras was an aircraft project that didn't reach export status.

SARANG (option B) is the Indian Air Force's helicopter aerobatic team that performs at air shows, showcasing the maneuvering capabilities of HAL's Dhruv and Cheetak helicopters. The name means 'peacock' in Sanskrit, referring to the team's colorful display. ICBMs are missiles, ISRO deals with space, and indigenous artillery guns are different defense equipment.

ARJUN is an indigenous Indian Main Battle Tank developed by DRDO, and BHISHMA is the Indian designation for the T-90 tank used by the Indian Army. Both are tanks, not missiles.

Nishant is India's Unmanned Aerial Vehicle (UAV) developed by the Aeronautical Development Establishment (ADE) for reconnaissance and surveillance operations. It is not a missile system.