Which one of the following is not correctly matched – 

The number of chambers in a human heart is – 

The important metal used with iron to make it rust-free – 

Which of the following organelles is called Atom bombs?

A steam engine converts the heat energy of steam into ______.

Our solar system consists of how many planets?

Which of the following transports water from the roots of the plant to its leaves? 

The cells which are responsible for the production of antibodies are