Rimjhim decided to do a small plant experiment at home. She covered one leaf of a hibiscus plant with black paper for a week. When she removed the cover, she observed that the covered leaf had turned pale yellow and felt softer. The other leaves were still bright green and firm. She wondered why the leaf looked unhealthy despite watering the plant regularly.

(i) Which process could not occur in the covered leaf?

(ii) State one important role of sunlight in this process.

(iii) What is the purpose of this process in plants?

(iv) Name the specific cells in a leaf where this process occurs.

(v) Which cell organelle carries out the above process?

(i) The process that could not occur in the covered leaf is photosynthesis.

(ii) Sunlight provides the energy required for photosynthesis.

(iii) The purpose of this process is to manufacture food for the plant.

(iv) The specific cells in a leaf where this process occurs are the mesophyll cells (especially palisade mesophyll cells).

(v) The cell organelle that carries out this process is the chloroplast.