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

• 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

• The age of a tree is determined by its Rings (Number of Annual Rings).
• Each annual ring generally represents one year of growth.
• Counting the rings on the trunk helps determine the tree's age.
• The study of tree rings is called Dendrochronology.

Last verified on 20-07-2026

Explanation

• Mitochondria are called the powerhouse of the cell.
• Because they produce Adenosine Triphosphate (ATP).
• ATP is the energy currency of the cell.
• ATP provides energy for different cellular activities such as movement, growth, and transport.
• Energy is produced through aerobic cellular respiration using oxygen and الغذائی molecules.
• They are found in the cytoplasm of most eukaryotic cells.
• Richard Altmann first described mitochondria in 1890.

Main Parts of a Cell:

1. Cell membrane → Outer protective layer
2. Nucleus → Controls cell activities
3. Cytoplasm → Jelly-like material between membrane and nucleus

Last verified on 09-05-2026

Explanation

• An electric generator is a device that converts mechanical energy into usable electrical energy.
• This process is based on the principle of electromagnetic induction.
• Discovered in 1831 by British scientist Michael Faraday.

Last verified on 27-04-2026

Explanation

• Silica (SiO₂) is the main component of glass.
• It providing its transparency and hardness.
• It forms a network structure when melted, giving glass its solid yet brittle nature.

Last verified on 07-06-2026

Explanation

• Natural gas is supplied through underground pipeline networks, making it convenient for homes.
• It is cleaner than solid fuels like coal or wood.
• It producing less smoke and ash.
• This makes it ideal for urban domestic energy use.

Last verified on 25-05-2026

Explanation

• Solar energy comes from the Sun.
• It is continuously available.
• It is a renewable energy source because it is naturally replenished.
• Fossil fuels (coal, petroleum, natural gas) are finite and polluting.

Last verified on 25-05-2026

Explanation

• The nucleus contains DNA (genetic material).
• It controls all cellular activities like growth, division, and protein synthesis.
• That is why it is called the control center of the cell.

Last verified on 25-05-2026

Explanation

• Vitamins act as protective nutrients in the body.
• They help regulate metabolism, immunity, and normal body functions.
• Their deficiency leads to specific diseases like scurvy (Vitamin C) and rickets (Vitamin D).

Last verified on 25-05-2026