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The correct answer is option 3 - solar energy into chemical energy.
Photosynthesis is the process by which plants, algae, and some bacteria convert solar energy into chemical energy in the form of glucose. During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.
Option 1 is incorrect because photosynthesis does not involve the conversion of chemical energy into radiant energy; instead, it involves the absorption of radiant energy (sunlight) by the plant`s chlorophyll pigments.
Option 2 is incorrect because photosynthesis does not involve the conversion of chemical energy into mechanical energy; instead, it involves the conversion of solar energy into chemical energy.
Option 4 is incorrect because photosynthesis does not involve the conversion of mechanical energy into solar energy.
Therefore, the correct answer is option 3 - solar energy into chemical energy.