How does the microalgae-based PureAir Tower work?

The microalgae-based PureAir Tower uses photosynthetic microalgae to absorb carbon dioxide (CO₂), particulate matter (PM), and nitrogen oxides (NOx) directly at street level. Through natural bioremediation, pollutants are converted into oxygen and algal biomass in real time with minimal energy input and no secondary filter waste.

What are Western Disturbances and when do they occur?

Western Disturbances are east-moving rain-bearing wind systems that originate beyond Iran and pick up moisture from the Mediterranean Sea. They primarily affect north and north-western India and the Himalayas and are most common during the winter months.

Which toxic gases are released when crude oil burns?

Burning crude oil releases toxic gases such as sulphur dioxide, carbon monoxide, hydrogen sulfide, and nitrogen oxides. It also emits dense soot clouds containing partially burned hydrocarbons and heavy metals, significantly increasing air pollution.

What are cycads and how are they pollinated?

Cycads are ancient plants often described as living fossils. They have the unique ability to raise their own temperature to attract pollinating insects. Unlike modern flowering plants, cycads are mainly pollinated by beetles rather than butterflies.

Which countries are divided by the Aras River?

The Aras River forms a natural and geopolitical boundary between Iran and Azerbaijan. Since the 1828 Treaty of Turkmenchay, the river has divided Azeri populations across the two countries.

Daily UPSC Prelims MCQs - Environment & Geography - 19th March 2026

Devesh
Mar 18
1 min read

Updated: Mar 26

Test your UPSC CSE 2026 preparation with today’s Environment & Geography (Every Thursday) Quiz — covering microalgae-based air tower, Western Disturbances, cycads, Aras river and more.

Previous UPSC Environment & Geography Quiz

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Daily UPSC Prelims MCQs - Environment & Geography - 19th March 2026

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