Q 01/05

Iron oxide, better known as rust, gives which planet its famous colour?

A) Venus

B) Jupiter

C) Mars

D) Saturn

Answer · why

C) Mars

Mars. Its rusty dust is so fine that winds can whip it into storms covering the whole planet; one in 2018 blotted out the Sun and ended the solar-powe...

Q 02/05

What gas do plants absorb from the atmosphere during photosynthesis?

A) Oxygen

B) Carbon dioxide

C) Atmospheric nitrogen

D) Hydrogen

Answer · why

B) Carbon dioxide

Carbon dioxide. Light energy drives the plant to build sugars from carbon dioxide and water, and the oxygen is given off as a by-product.

Q 03/05

Which household antiseptic fizzes on a cut as an enzyme in blood breaks it down?

A) Chlorine bleach

B) Rubbing alcohol

C) Hydrogen peroxide

D) Tincture of iodine

Answer · why

C) Hydrogen peroxide

Hydrogen peroxide, H2O2, is water's formula plus one oxygen atom; the enzyme catalase, found in blood and most living cells, splits it back into water...

Q 04/05

How many bones are in the adult human body?

A) 26

B) 86

C) 206

D) 606

Answer · why

C) 206

206 is the usual adult count. A newborn has around 270 bones, and the number falls because many of them fuse together as the skeleton grows.

Q 05/05

Which is the only mammal capable of true, powered flight?

A) Flying squirrel

B) Sugar glider

C) Bat

D) Colugo

Answer · why

C) Bat

Bat. Its wing is a modified hand, a thin membrane stretched between very long finger bones that it can flap; flying squirrels, sugar gliders and colug...