Explanation

• The orbit of the Earth around the Sun is an ellipse, meaning that it is an elongated circle, with the Sun located at one of the two foci (plural of focus) of the ellipse.
• This means that the distance between the Earth and the Sun varies throughout the year.
• With the closest point (perihelion) occurring around early January.
• With the farthest point (aphelion) occurring around early July.
  

Explanation

• A thermometer is typically made up of a glass tube filled with Mercury (Hg), a silvery-white liquid metal.
• The Mercury expands or contracts in response to changes in temperature, allowing us to measure the temperature.

Explanation

The the life cycle of a butterfly:

• Eggs: The female butterfly lays eggs on a leaf.
• Caterpillar (Larva): The egg hatches into a caterpillar, which eats and grows.
• Pupa (Chrysalis): The caterpillar transforms into a pupa, a resting stage where it undergoes metamorphosis.
• Adult (Butterfly): The pupa emerges as a fully formed adult butterfly, ready to fly and reproduce.

Explanation

• The thickness of skin is around 2 millimeters (0.08 inches) thick.
• The skin has two main layers (epidermis - outer layer) and the (dermis - inner layer).
• The epidermis is about 0.05-1.5 millimeters thick.
• The dermis is about 1-4 millimeters thick.

Explanation

• The adult human brain weighs about 3 pounds (1,300-1,400 g).
• The adult human brain is about 2% of the total body weight.
• The average human brain is 140 mm wide.
• The average human brain is 167 mm long.

Explanation

• Permanent magnets are materials that retain their magnetism for a long time.
• They are typically difficult to magnetize, but once magnetized, they retain their magnetic properties.

Explanation

• Laboratory thermometers typically have a range of 10°C to 110°C.
• It allowing for precise temperature measurements in a variety of laboratory settings.

Explanation

The diseases caused by deficiency of Copper is:

• Anaemia
• Kidney problems
• Starvation

Note: According to Sindh Textbook Board, Jamshoro

Explanation

Dietary fiber has numerous health benefits, including:

• Preventing or relieving Constipation: Fiber helps promote regular bowel movements and prevents constipation by adding bulk to stool and softening it.
• Lowering diabetes risk: Soluble fiber, found in foods like fruits, vegetables, and legumes, can slow sugar absorption and improve insulin sensitivity, reducing the risk of developing type 2 diabetes.
• Reducing Heart disease risk: Fiber helps lower cholesterol levels, blood pressure, and inflammation, all of which can contribute to heart disease.

Explanation

Vitamin K is essential for blood clotting and plays a crucial role in the production of platelets, which are vital for stopping bleeding when you're injured.

Vitamin K deficiency can lead to bleeding disorders, easy bruising, and poor wound healing.

Vitamin K helps to:

• Activate clotting factors in the liver
• Produce platelets in the bone marrow
• Form blood clots to stop bleeding