mixtures and impurities, blood and speed.

These are disease-causing microorganisms like harmful bacteria and viruses.

• Allies
• Pathogens
• Protectors
• Benefactors

. It is a substance made by some white blood cells which stick to pathogens to make them easier for other white blood cells to attack.

• hormones
• antibodies
• pathogens

• sickle-cell

All of the following describe about the white blood cells, EXCEPT __________________.

• It has irregular shape.  

• Its size is larger than the red blood cell.

• It kills pathogens

• It prevents or stops bleeding

Which component of the blood is responsible in carrying oxygen going to the body cells?

• White blood cells
• Platelets
• Red blood cells
• Plasma

How does blood donation help others?

• This helps in recovering from blood loss from operation or due to accidents.

• . It can help cure diseases.

• It can help in blood transfusion to those people with injuries.

• All of them

The human body makes over a ____________red blood cells every second in the sternum, ribs and vertebrae of the skeleton.

• trillion

• hundred

• million

• billion

Radar stands for _______________________

• Randomly Adjusted Data and Readings
• Retrograde Analysis and Research
• Radio Detection and Ranging
• Rapidly Advancing Digital and Robotics

A time-keeper which uses the vibration of atoms to measure time.

• atomic clock
• nuclear watch
• molecular timer
• elemental stopwatch

Who is the driver of the vehicle Spirit of America?

• Michael Schumacher
• Craig Breedlove
• Lewis Hamilton
• Dale Earnhardt

Who is the driver of the vehicle Thrust SSC

• Andy Green
• David Brown
• Sarah Smith
• Michael Johnson