Explanation

Protoplasm is the living substance inside a cell, including cytoplasm and nucleus, where water makes up about 70%.

Water is essential for maintaining the structure, function, and chemical reactions in the protoplasm.

Explanation

In a straight forward roll, the hands push against the ground to initiate and guide the roll.

This helps shift the body weight forward and maintain balance during the movement.

Explanation

Vitamin B9 is chemically known as Folic acid.

It is important for DNA synthesis, cell growth, and preventing neural tube defects in pregnancy.

Explanation

DRABC stands for Danger, Response, Airway, Breathing, Circulation — essential for checking vital signs in emergencies.

RICES stands for Rest, Ice, Compression, Elevation, Support — used mainly for soft tissue injuries like sprains.

Explanation

Venus is the hottest planet in the solar system.

Venus has no moons.

The "black planet" is Venus.

The second closest planet to the sun is Venus.

The slowest-rotating planet is Venus.

Venus is similar in size to Earth.

Additional information:

Eight planets in the solar system: 

1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune

Explanation

LPG (Liquefied Petroleum Gas) mainly consists of hydrocarbons like propane and butane.

These are gases composed of hydrogen and carbon atoms.

It is used as fuel for cooking and heating.

Explanation

The 4×100 meter relay was first introduced at the 1912 Stockholm (Sweden) Olympics for men.

It became a standard Olympic track event from that year onward.

Explanation

Skin regulates body temperature through sweating, blood flow adjustment, and insulation.

It helps maintain homeostasis by releasing heat or conserving warmth as needed.

Explanation

An odometer measures the total distance a vehicle has traveled.

It is usually located on the dashboard near the speedometer.

Explanation

The cell membrane of cardiac muscle cells maintains an electrochemical gradient of sodium (Na⁺), potassium (K⁺), and calcium (Ca²⁺) ions.

These ions are crucial for generating and transmitting electrical impulses that cause heart contractions.