$\begin{array}{1 1} \text{a. The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called absorption spectrum} \\ \text{b. Chl a and Chl b absorb maximum light in blue and red wavelengths of light} \\ \text{c. Rate of photosynthesis is maximum in blue and red wavelengths of light} \\ \text{d. All of these} \end{array} $
