Tag: science & technology

Carbon dioxide is the primary greenhouse gas, while methane ranks second in both atmospheric concentration and warming potential among greenhouse gases emitted by human activities. Methane traps about 25 times more heat per molecule than CO2 over a 100-year period, making it a significant contributor to climate change despite lower concentrations.

Earth Day is observed globally on April 22 each year to raise awareness about environmental protection. The date was chosen in 1970 for the first Earth Day and has been celebrated annually since, making it one of the largest secular observances worldwide.

Internet Explorer is a web browser - software used to access and navigate websites on the internet. Web browsers allow users to view web pages, follow hyperlinks, and display text, images, and multimedia content from the World Wide Web.

The ozone layer in the stratosphere protects Earth from harmful ultraviolet (UV) radiation by absorbing most of the sun's UV-B and UV-C rays. This layer, located 15-35 km above Earth's surface, is crucial for protecting living organisms from DNA damage and skin cancer.

Shark liver oil is the correct answer - certain shark species (particularly deep-water sharks like dogfish) are commercially harvested for their livers to produce shark liver oil, which is rich in vitamins and historically used in supplements. The question phrasing could be clearer about specifying shark liver oil.

Southern India has the largest elephant population, with states like Karnataka, Kerala, Tamil Nadu, and Andhra Pradesh hosting significant numbers of Asian elephants in their forests and wildlife sanctuaries. The region's favorable climate, extensive forest cover, and protected areas support large elephant populations.

Polar bears are critically endangered due to global warming because they depend on Arctic sea ice for hunting seals, their primary food source. As sea ice melts and breaks up earlier each year, polar bears have reduced hunting opportunities and face starvation, making them emblematic of climate change impacts.

Plant cells are the only option among these that contain both plastids (like chloroplasts for photosynthesis) and large central vacuoles. Plastids are membrane-bound organelles unique to plant and algal cells, while vacuoles store water, nutrients, and help maintain cell structure.

HTTP stands for Hypertext Transfer Protocol, the foundational communication protocol of the World Wide Web. It defines how messages are formatted and transmitted between web servers and browsers, enabling the retrieval and display of web pages and resources.