In the given pie chart,what do '$a$' and '$b$' represent respectively?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Clarias gariepinus	$(1)$ Zebra
$(b)$ Lantana	$(2)$ Tiger
$(c)$ Bali	$(3)$ Weed
$(d)$ Quagga	$(4)$ African Catfish

$A$ - Loss of biodiversity in a region may lead to an increase in plant production.
$R$ - Loss of biodiversity in a region may lead to lowered resistance to environmental perturbations such as drought.

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$A$. The Evil Quartet	$I$. Cryopreservation
$B$. Ex situ conservation	$II$. Alien species invasion
$C$. Lantana camara	$III$. Causes of biodiversity losses
$D$. Dodo	$IV$. Extinction

Choose the option with all correct matches:

Using the provided graph,determine the percentage of bird species that will be lost if the island's inhabitable land area is reduced from $100,000\, km^2$ to $1\, km^2$.

Which of the following pairs of an animal and a plant represents endangered organisms in India?