The function of white blood cells is:
A. Carry oxygen
B. Fight infections
C. Produce insulin
D. Produce bile
Which vitamin helps in vision?
A. Vitamin C
B. Vitamin D
C. Vitamin A
D. Vitamin K
The chemical formula of water is:
A. CO2
B. H2
C. H2O
D. O2
Which planet is known as the Red Planet?
A. Venus
B. Jupiter
C. Mars
D. Mercury
The part of the eye that controls the amount of light entering is:
A. Lens
B. Retina
C. Cornea
D. Iris
What is the main component of bones?
A. Collagen
B. Fat
C. Calcium
D. Iron
The Earth’s inner core is made mostly of:
A. Oxygen
B. Iron and Nickel
C. Carbon
D. Magnesium
Which process do plants use to release oxygen?
A. Respiration
B. Photosynthesis
C. Fermentation
D. Transpiration
The largest internal organ in humans is:
A. Heart
B. Kidney
C. Liver
D. Stomach
The unit of electric current is:
A. Volt
B. Ampere
C. Ohm
D. Watt