Explanation

• Vitamin A is essential for vision, skin health, and immune function.
• Its deficiency can lead to night blindness (poor ight vision) and other health problems.

Additional information:

• Dry skin and eyes
• Impaired immune function
• Poor wound healing
• Increased risk of respiratory and urinary tract infections

Last verified on 17-01-2026

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Last verified on 02-04-2026

Explanation

• Conductors are materials that allow electricity to flow through them, such as copper, aluminum, and gold.
• They have a high concentration of free electrons, which are able to move freely within the material.

Additional information:

• Materials that do not allow electricity to pass through them are called insulators.

Last verified on 07-03-2026

Explanation

• The human body typically has 206 bones
• At the time of birth, there are 270 (300) bones which fuse with time to come to a total of 206 bones.

The total bones of our body can be divided into:

• The axial skeleton (80) 
• The appendicular skeleton (126)

The newborn child has 300 bones.

• Longest bone: Femur (thigh bone)
• Shortest: Stapes (one of the 3 small bones inside the ear)

The human head has 22 bones.

Last verified on 30-03-2026

Explanation

• Noise intensity is measured in decibels (dB).
• It indicates the loudness of sound.
• It helps assess noise pollution in cities, industries, and traffic areas.
• Noise pollution affects hearing, stress levels, and sleep.
• Reducing exposure above 85 dB is important for health protection.

Last verified on 19-03-2026

Explanation

• Cat and Dog is/are a secondary consumer.
• Because they eats primary consumers (herbivores).
• Like mice, birds, and rabbits.

Last verified on 19-03-2026

Explanation

• A permanent magnet retains its magnetism for a long time.
• It is hard to magnetize but difficult to demagnetize once magnetized.
• Made from hard magnetic materials like steel or alnico.
• Unlike temporary magnets, it does not lose its magnetism easily.

Last verified on 17-03-2026

Explanation

• Lung cancer is a disorder of the respiratory tract caused by uncontrolled cell division.
• It leads to the formation of abnormal masses or tumors in the lungs.
• Major types include Small Cell Lung Cancer (SCLC) and Non-Small Cell Lung Cancer (NSCLC).
• Risk factors: Smoking, air pollution, genetic predisposition.
• Symptoms may include cough, chest pain, shortness of breath, and coughing blood.

Last verified on 17-03-2026

Explanation

• The Canines are pointed teeth that are adapted for tearing and slashing.
• Teeth are specialized structures in the mouth for biting, tearing, and chewing food.
• Humans have different types of teeth: incisors, canines, premolars, and molars.
• Humans have 4 canines (2 upper, 2 lower) used for tearing meat.

Last verified on 16-03-2026

Explanation

• A solar day is the time taken by the Earth to complete one full rotation on its axis relative to the Sun.
• Length of a solar day = 24 hours = 1,440 minutes
• Length of a sidereal day = 23 hours 56 minutes 4 seconds
• Earth rotates approximately 360° relative to the Sun in a solar day
• Lunar day = ~24 hours 50 minutes (Moon’s rotation relative to Sun)

Last verified on 15-03-2026