Explanation

• Meteorologists are scientists who study the atmosphere and weather conditions.
• They forecast tornadoes, hurricanes, floods, and other weather events using satellites, radar, and computer models.
• Their work helps in early warning systems and disaster management.

Last verified on 12-03-2026

Explanation

• Wavelength is the distance between two successive crests or two successive troughs in a transverse wave.
• It represents one complete cycle of a wave.

Additional information:

• Symbol used: λ (Lambda)
• SI unit: meter (m)
• Wave formula: v = fλ
• Example wavelength values: 1 m, 0.5 m, 10 cm, 500 nm, 700 nm
• Visible light wavelength range: ~400 nm – 700 nm

Last verified on 12-03-2026

Explanation

• Meiosis is a special type of cell division that produces four daughter cells from one parent cell.
• These cells are haploid (n), meaning they contain half the number of chromosomes.
• Meiosis is essential for sexual reproduction and genetic variation.

Last verified on 12-03-2026

Explanation

• Venera-9 was the first spacecraft to land on the surface of Venus.
• Launched by the Soviet Union in 1975.
• It was designed to study the Venusian atmosphere and surface.
• It successfully transmitted data from the planet's surface for 53 minutes before its batteries failed.

Last verified on 12-03-2026

Explanation

• An Addition Reaction is a chemical reaction in which two or more substances combine to form a single compound.
• It is also called a Combination Reaction in basic chemistry.
• This reaction usually releases heat or energy.

Last verified on 12-03-2026

Explanation

• An optical instrument used to measure the properties of visible light is called a Spectroscope.
• It analyzes the composition and properties of materials based on the light they emit or absorb.
• It helping us understand the physical and chemical properties of objects in the universe.

Last verified on 12-03-2026

Explanation

• Global Positioning System (GPS) is a satellite-based navigation system used to monitor the location and movement of vehicles, ships, and aircraft.
• Developed by the United States, it provides accurate position, navigation, and timing information worldwide.
• Widely used in transportation, mapping, military operations, and smartphones.

Last verified on 12-03-2026

Explanation

• Solar panels convert sunlight into electrical energy using special cells.
• Solar energy is a renewable and clean source of energy.
• These cells are called photovoltaic (PV) cells because they generate electricity when exposed to light.
• The technology is based on the photovoltaic effect, discovered in 1839.

Last verified on 11-03-2026

Explanation

• Bacteria are prokaryotic organisms, meaning they do not have a true nucleus.
• Their genetic material (DNA) is not enclosed in a membrane-bound nucleus.
• Instead, the DNA is present in a region called the nucleoid within the cytoplasm.
• Therefore, bacterial DNA is found floating in the cytoplasm of the cell.

Additional information:

• In contrast, eukaryotic cells (plants, animals, fungi) have DNA enclosed inside a nucleus.

Last verified on 11-03-2026

Explanation

• The molecular structure (double-helix model) of DNA was proposed in 1953.
• This model explained how DNA replicates and carries genetic information in living organisms.
• The discovery was made by James Watson and Francis Crick, two molecular biologists.

Last verified on 11-03-2026