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Consider the following statements about photosynthesis: 1. The process occurs only in the chloroplasts of plant cells. 2. Oxygen is released as a by-product of the light-dependent reaction. 3. Carbon dioxide fixation occurs during the dark reaction (Calvin cycle). Which of the above statements are correct?

Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph. 1. Through photosynthesis, they convert sunlight into energy, forming the base of most food chains. 2. Plants are essential to life on Earth, playing several indispensable roles. 3. They also release oxygen into the atmosphere, a critical component for animal respiration. 4. Without plants, the intricate web of life as we know it would simply collapse.