What type of sugar is glyceraldehyde?

The centroid of the triangle formed by the lines $6x^2 + xy - y^2 = 0$ and $x + 3y - 10 = 0$ is

$A$ compound absorbs light in the wavelength region $490-500 \ nm$. Its complementary colour is

If the number of diagonals of a regular polygon is $35$,then the number of sides of the polygon is

Given the standard electrode potentials,
$K^{+} / K = -2.93 \ V$,$Ag^{+} / Ag = 0.80 \ V$
$Hg^{2+} / Hg = 0.79 \ V$
$Mg^{2+} / Mg = -2.37 \ V$,$Cr^{3+} / Cr = -0.74 \ V$
Arrange these metals in their increasing order of reducing power.

What is the percentage of Photosynthetically Active Radiation $(PAR)$ in the incident solar radiation?