The process by which plants make their own food is called:
A. Respiration
B. Photosynthesis
C. Digestion
D. Transpiration
The boiling point of water at sea level is:
A. 90°C
B. 80°C
C. 100°C
D. 120°C
Which gas do humans inhale for survival?
A. Carbon dioxide
B. Nitrogen
C. Oxygen
D. Hydrogen
The main source of energy for the Earth is:
A. Moon
B. Sun
C. Stars
D. Earth’s core
Which part of the plant absorbs water from the soil?
A. Stem
B. Flower
C. Roots
D. Leaf
The hardest natural substance on Earth is:
A. Gold
B. Silver
C. Diamond
D. Quartz
The chemical symbol for water is:
A. H2
B. O2
C. H2O
D. CO2
Humans have how many teeth in adulthood?
A. 28
B. 30
C. 32
D. 32
The organ responsible for pumping blood in humans is:
A. Liver
B. Lungs
C. Heart
D. Kidney
Which planet is known as the Red Planet?
A. Venus
B. Mercury
C. Jupiter
D. Mars