Science & Nature Quiz

Dengue fever is caused by flaviviruses, specifically Dengue virus (DENV), transmitted by Aedes mosquitoes. Bacillus cereus is a bacterium causing food poisoning. BK virus causes respiratory infections. Machupo virus causes Bolivian hemorrhagic fever.

Clostridium perfringens is a common bacterial cause of food poisoning, typically associated with improperly cooked meats and gravies that have been left at unsafe temperatures. While multiple bacteria can cause food poisoning, C. perfringens is one of the most frequently identified pathogens in foodborne outbreaks.

Trypanosoma brucei is the protozoan parasite that causes African sleeping sickness (African trypanosomiasis), transmitted by tsetse flies. The other options are incorrect: Fonsecaea causes chromoblastomycosis, Clostridium difficile causes antibiotic-associated diarrhea, and Ehrlichia causes ehrlichiosis.

Plasmodium genus (specifically P. falciparum, P. vivax, P. ovale, P. malariae, and P. knowlesi) is the definitive causative agent of malaria, transmitted by Anopheles mosquitoes. The other options are incorrect: Taenia causes tapeworm infection, Clonorchis causes liver fluke infection, and Histoplasma is a fungal pathogen.

Paper was invented in China during the Han Dynasty, traditionally credited to Cai Lun around 105 CE. Although earlier forms existed, Cai Lun standardized the process using mulberry bark, hemp, and rags. China maintained a monopoly on papermaking for centuries before it spread to the Islamic world and then Europe.

Yersinia pestis is the bacterium that causes plague, including bubonic, septicemic, and pneumonic forms. It is transmitted primarily by fleas from rodents. The other options are incorrect: Varicella zoster causes chickenpox, Anaplasma causes anaplasmosis, and Balantidium coli causes balantidiasis.

The Egyptian plover (also called Nile plover) is known for its symbiotic relationship with crocodiles, entering their mouths to clean parasites and food particles. This behavior, though popular in folklore, is debated by scientists. The other options are incorrect: sparrows, kingfishers, and crows do not exhibit this behavior.

A gecko is a small lizard commonly found in houses, especially in warmer regions. They are distinct from dinosaurs (extinct reptiles), bats (mammals that fly), and snakes (legless reptiles).

Hummingbirds are the smallest birds in the world, with species like the bee hummingbird measuring just 2-5 inches. Sparrows are small but larger than hummingbirds, while kiwis and kittiwakes are much bigger birds.

Bears are well-known for their love of honey and frequently raid beehives in the wild. Marmalade, jam, and sugarcane are human-processed foods not associated with natural bear behavior.

The giant panda is native only to China and found exclusively in the wild there. Tigers and Asian elephants range across multiple Asian countries, while crocodiles have a global distribution.

The painted turtle is an aquatic turtle that spends most of its life in water and is commonly found in freshwater habitats across North America. Mud, box, and swamp turtles are primarily terrestrial or semi-terrestrial.

The green anaconda is considered the heaviest snake in the world, weighing up to 550 pounds. While the reticulated python is the longest, the anaconda's massive girth makes it the heaviest. Vipers and boa constrictors are smaller.

The bee hummingbird lays the world's smallest egg, weighing less than a gram. Hornbills, gulls, and woodpeckers lay much larger eggs relative to their body size.

Ostriches have eyes that are larger than their brains, an adaptation for their excellent eyesight needed to detect predators. Eagles, owls, and parrots do not have this extreme eye-to-brain size ratio.

Chameleons have independently moving eyes that can look in two different directions simultaneously. Lizards, snakes, and tortoises cannot do this.

The Geysers in California is the world's largest geothermal field with over 1.5 GW capacity. Sudan, Chad, and Columbia have negligible or no major geothermal installations.

Kenya leads in household solar adoption, particularly off-grid solar home systems, with companies like M-KOPA enabling widespread rural electrification through solar.