Accumulation of which one of the following in the muscle leads to fatigue? 

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?