The correct answer is option 1: blue and red region of light. Photosynthesis is the process through which plants convert light energy into chemical energy in the form of glucose. The process of photosynthesis primarily involves pigments called chlorophylls, which are responsible for absorbing light. Chlorophylls have maximum absorption in the blue and red regions of the light spectrum. This means that plants can efficiently absorb and use light energy from these regions to carry out photosynthesis. Option 2, green and yellow region of light, is not correct because chlorophylls poorly absorb light in these regions, which is why plants are green. Option 3, blue and orange region of light, is incorrect because the orange region is not known to have maximum absorption by chlorophylls. Option 4, violet and orange region of light, is also not correct because the violet region is not where chlorophylls have maximum absorption.