The branch of botany that deals with the study of algae is known as:

What is the scientific name of Jojoba?

Which group of plants was the first to exist on Earth?

The partial pressure of oxygen in the alveoli of the lungs is

$A$ balloon with mass $m$ is descending down with an acceleration $a$ (where $a < g$). How much mass should be removed from it so that it starts moving up with an acceleration $a$?

The cyclotron frequency of an electron gyrating in a magnetic field of $1\, T$ is approximately