Explanation

• Carbon dioxide (CO₂) — the main greenhouse gas causing global warming.

Additional information:

• Methane (CH₄) — potent, from livestock and fossil fuels.
• Nitrous oxide (N₂O) — from fertilizers and industry.
• Water vapor — natural, amplifies warming.
• Fluorinated gases — synthetic, very strong effect.

Explanation

• Heinrich Wilhelm Waldeyer coined the word "neuron" in 1891.
• He based it on the ancient Greek word for sinew or cord.
  
• Neuron theory/doctrine emerged at the end of the 19th century.
• Core claim — Nerve tissue = individual cells; each is a genetic, anatomic, functional, and trophic unit.
  
  Last updated by NA on 09-09-2026

Explanation

• Cumulonimbus clouds are tall, dense clouds associated with thunderstorms.
• They can produce hail, heavy rain, lightning, and strong winds.
• Hail forms when strong updrafts inside these storm clouds carry water droplets upward, where they freeze.

Last verified on 09-09-2026

Explanation

• ECG stands for Electrocardiogram.
• It is a test that records the electrical activity of the heart.
• It is commonly used to check heart rate and rhythm.

Last verified on 09-09-2026

Explanation

• A picosecond (ps) is equal to 10⁻¹² seconds.

Additional information:

• Millisecond = 10⁻³ second
• Microsecond = 10⁻⁶ second
• Nanosecond = 10⁻⁹ second

Last verified on 08-09-2026

Explanation

• Total bones in adult human body = 206
• At birth = 270–300 bones (fuse to become 206)

The total bones of our body can be divided into:

• Axial skeleton = 80 bones
• Appendicular skeleton = 126 bones

Additional information:

• Newborn baby has 300 bones
• Longest bone = Femur
• Shortest bone = Stapes
• Bones in human skull = 22

Last verified on 30-03-2026

Explanation

• Insulin is produced by the pancreas.
• The pancreas contains clusters of cells called the Islets of Langerhans.
• Beta (β) cells within these islets produce and secrete insulin.
• Insulin helps regulate blood glucose (sugar) levels by promoting glucose uptake into cells.

Last verified on 07-09-2026

Explanation

• Iodine deficiency causes goiter, an enlargement of the thyroid gland.
• Iodine is essential for the production of thyroid hormones.
• Severe iodine deficiency during pregnancy or early childhood can impair brain development.

Last verified on 07-09-2026

Explanation

• A cell is the basic unit of life.
• Different parts of the cell have different functions.
• Genetic material controls heredity and traits.
• It is mainly found in a specific control center of the cell.
• This control center is called the nucleus.

Last verified on 14-05-2026

Explanation

• Mercury Symbol: Hg
• Atomic number: 80
• Melting point: -38.83 °C
• Atomic mass: 200.59 u

Last verified on 13-03-2026