Explanation

The patella is commonly known as the kneecap.

It is part of the human skeletal system.

It protects the knee joint and helps in movement.

It is the largest sesamoid bone in the body.

Explanation

Heavy water (D₂O) is used as a moderator because it slows neutrons without absorbing them much.

A moderator slows down fast neutrons in a nuclear reactor.

Slower neutrons help sustain the fission chain reaction.

Pakistan’s nuclear reactors commonly use heavy water as a moderator.

Explanation

The enzyme responsible for breaking down starch into maltose in the human digestive system is amylase. 

Amylase is an enzyme produced in the saliva and pancreas that specifically breaks down starch into smaller sugar molecules like maltose.

Explanation

جب کوئی انسان جگر میں سوجن کا شکار ہوجائے تو اس بیماری کو ہیپاٹیٹس کہا جاتا ہے۔

One person in every 30 seconds die due to Hepatitis in the world.

Explanation

The statement "To every action there is always an equal and opposite reaction" is Newton's Third Law of Motion.

This law states that for every interaction between two objects, a pair of forces is produced—these forces are equal in magnitude and opposite in direction, acting on the interacting objects. 

Explanation

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

Radius: 6,371 km

Mass: 5.972 × 10^24 kg

Distance from Sun: 149.6 million km

Density: 5.51 g/cm³

Orbital period: 365 days

Explanation

A mass of ice originating in mountains in snowfields above the snowline is called a Glacier.

Glaciers slowly move downhill due to gravity.

They are a major source of freshwater and rivers in the mountains.

Explanation

• Veins are the blood vessels that carry blood from other parts of the body back to the heart.
• They have one-way valves that prevent blood from flowing backwards and ensure it keeps moving towards the heart.

Explanation

Tectonic Plates Movement (Most Common): The Earth's crust is broken into large tectonic plates that constantly shift. 

Volcanic Activities: Movement of magma beneath volcanoes can cause shifts and trigger earthquakes.

Tectonic Dislocation (Faults): This refers to the actual fractures (faults) in the crust where plates slide past each other, which is the direct mechanism for most plate-related earthquakes.

Other Causes: Human activities (mining, large reservoirs) and even large collapses of rock can also cause minor seismic events. 

Explanation

Nuclear fission is the splitting a heavy nucleus into smaller nuclei. 

The word "fission" means splitting, so in nuclear fission, a large, unstable nucleus is split apart into smaller nuclei, releasing energy in the process.