In India, we find mangoes with different flavours, colours, fibre content, sugar content and even shelf-life. The large variation is on account of

Biodiversity refers to $........$

The species,though insignificant in number,determine the existence of many other species in a given ecosystem. Such species is known as

Which part of the world has a high density of organisms?

Which ecosystem shows maximum genetic diversity?

$X$ - India has $2.4\%$ of the world's land area.
$Y$ - The diversity of plants and animals is not uniform throughout the world but shows a rather uneven distribution.
$Z$ - Species-area relationships were given by Alexander von Humboldt.
Identify the truth value of $X, Y,$ and $Z$ respectively.