HARD General Knowledge

Which is the hardest naturally occurring substance found on the Earth

• Emerald

• Diamond

• Granite

• Gypsum

What is not a component of chlorophyll? Nitrogen or Calcium?

• Nitrogen

• Calcium

Water in plants is transported by

• Root

• Stem

• Xylem

• Node

How many zeros are there in one billion?

• 21

• 12

• 5

• 9

In which number system, there is no symbol for zero?

• Modern number system(1234)

• Symbol system

• Roman numerals(i, ii, iii)