Photosynthesis that converts light energy into chemical energy by the plants, involves the use of green pigments of leaves called chlorophyll. The only structure in a leaf that hosts chlorophyll is:

Photosynthesis is the process by which plants convert light energy into chemical energy, primarily occurring within the leaves [4]. The specific cell organelles responsible for hosting the green pigment chlorophyll are called chloroplasts [2]. These organelles act as the 'food factories' of the plant, where chlorophyll absorbs sunlight to facilitate the reaction between carbon dioxide and water to produce glucose and oxygen [5]. Within the chloroplast, chlorophyll is specifically located in the thylakoid membranes, which are organized into stacks called grana [1]. While other organelles like the nucleus contain genetic material and ribosomes handle protein synthesis, only chloroplasts possess the specialized structure and pigments necessary for capturing solar energy and initiating photochemistry [6]. Therefore, the chloroplast is the unique structure in a leaf that hosts chlorophyll for photosynthesis.

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 1: BASIC CONCEPTS OF ENVIRONMENT AND ECOLOGY > Photosynthesis and respiration > p. 15
2. [4] Science-Class VII . NCERT(Revised ed 2025) > Chapter 10: Life Processes in Plants > 10.2.2 Role of air in the preparation of food > p. 144
3. [2] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > QUESTIONS > p. 82
4. [3] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 13: Plant Diversity of India > Leaves: > p. 204
5. [5] https://education.nationalgeographic.org/resource/photosynthesis/
6. [6] https://pmc.ncbi.nlm.nih.gov/articles/PMC5969280/