Explanation

A dentist diagnoses and treats tooth decay, cavities, and other dental problems.

Caries refers to tooth decay or cavities caused by bacteria.

It affects enamel and dentin of the teeth.

Early treatment prevents pain, infection, and tooth loss.

The specialist for oral health issues should be consulted.

Explanation

Hemophilia is a genetic blood disorder passed from parents to offspring.

It causes failure of normal blood clotting, leading to excessive bleeding.

Explanation

During photosynthesis, plants release oxygen (O₂) as a by-product.

Carbon dioxide is absorbed, not released, during this process.

Formula: 6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂

Oxygen released supports breathing for humans and animals.

Explanation

Mood disorders affect a person’s emotional state.

In some disorders, moods alternate between high and low extremes.

This can affect daily life, relationships, and work performance.

Proper diagnosis is important for treatment and therapy.

Bipolar disorder causes extreme mood swings between mania (high) and depression (low).

Unlike unipolar depression, it involves both elevated and depressed moods.

Manic episodes may include high energy, rapid speech, and risk-taking behavior.

Treatment usually involves mood stabilizers and psychotherapy.

Explanation

Amnesia is a common term used to describe memory loss.

Loss can be temporary or permanent, but "amnesia" usually refers to temporary diversity.

Causes include head and brain injuries, certain medications, alcohol, traumatic events, or conditions such as Alzheimer's disease.

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

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