Explanation

• Enamel is the hard, mineralized outer layer of teeth.
• It protects the inner parts of the tooth from damage and decay.
• Enamel is the hardest substance in the human body.
• It is mainly made of calcium phosphate.
  

Additional information:

• Incisors (8) – used for cutting food
• Canines (4) – used for tearing food
• Premolars (8) – help crush and grind food
• Molars (12) – grind food during chewing
• Total adult teeth = 32

Last verified on 13-03-2026

Explanation

• A thermal conductor is a material that allows heat to pass through it easily.
• Metals like copper, aluminum, and iron are good thermal conductors.
• Thermal conduction occurs mainly in solids where particles are closely packed.
• In contrast, thermal insulators (like wood, plastic, and rubber) resist heat flow.

Last verified on 13-03-2026

Explanation

• Iodine deficiency can cause mental retardation in children.
• Particularly if the deficiency occurs during fetal development or early childhood.
• This is because iodine is essential for brain development and thyroid function.

Last verified on 08-03-2026

Explanation

• Peanuts are a legume and a good source of protein,
• It containing about 20.5 grams of protein per 100 grams.

Additional information:

• Apples: 0.3 grams of protein per medium-sized fruit
• Watermelon: 0.6 grams of protein per cup
• Mango: 1.4 grams of protein per cup

Last verified on 08-03-2026

Explanation

• Carnivores are animals that eat only meat, primarily from other animals.
• Examples of carnivores include lions, tigers, bears, wolves, and sharks.

Additional information:

• Animals that eat plants exclusively are herbivores.
• Animals that eat both plants and meat are called omnivores.

Last verified on 07-03-2026

Explanation

• Decomposers are organisms that break down dead and waste products, releasing useful elements such as carbon, nitrogen, and phosphorus back into the soil and environment.
• This process is called decomposition, and it's an essential step in the nutrient cycle.

Decomposers include organisms like:

• Bacteria
• Fungi (such as mushrooms)
• Detritivores (such as earthworms and insects)

By breaking down organic matter, decomposers help to:

• Recycle nutrients
• Improve soil structure and fertility
• Support plant growth and development

Last verified on 07-03-2026

Explanation

• An iron nail/steel rod can be magnetized by passing an electric current around it, a process known as electromagnetic induction.
• This is the principle behind electromagnets.

Last verified on 07-03-2026

Explanation

• Apples contain about 0.3 grams of protein medium-sized fruit.
• Watermelon: 0.6 grams of protein per cup.
• Mango: 1.4 grams of protein per cup.
• Peanuts: 20.5 grams of protein per 100 grams.

Last verified on 06-03-2026

Explanation

A deficiency of sodium can lead to imbalances in fluid volume in the vessels and tissues, resulting in conditions such as:

• Hyponatremia (low sodium levels in the blood)
• Fluid retention and swelling
• Edema (excess fluid in tissues)

Last verified on 06-03-2026

Explanation

• The normal body temperature is: 37°C.
• The average normal body temperature is generally accepted as 98.6°F (37°C).
• A temperature over 100.4°F (38°C) means you have a fever.

Additional Information:

• Hypothermia is the term used for temperature less than 36.50°C.
• Mild Pyrexia is the term used for temperature (99-100°F).
• Moderate Pyrexia is the term used for temperature (100-103°F).
• Severe Pyrexia is the term used for temperature (103-105°F).