Find the equation of an ellipse that satisfies the following conditions: Ends of Major Axis $\;(0, \pm\sqrt 5)$, Ends of Minor Axis $\;(\pm 1,0)$

Question

$\begin{array}{1 1}\frac{x^2}{1}+\frac{y^2}{5}=1 \\ \frac{x^2}{5}+\frac{y^2}{1}=1 \\ \frac{x^2}{16}+\frac{y^2}{5}=1 \\ \frac{x^2}{9}+\frac{y^2}{25}=1\end{array} $