Question

Given below is a diagrammatic representation of cross-section of a leaf: 

Identify ‘P’ in the given diagram and write down its role in plants. Write down a balanced equation of process of photo-synthesis.

Hint:

Palisade mesophyll = Main photosynthesis site. Photosynthesis: CO$_2$ + H$_2$O → Glucose + O$_2$ (sunlight).

Answer 1

Concept: A leaf cross-section shows different layers involved in photosynthesis, including epidermis, mesophyll cells, vascular bundles, and stomata. (i) Identification of ‘P’ and its Role: P = Palisade mesophyll Role:

• Palisade mesophyll cells contain a large number of chloroplasts.
• They are the main site of photosynthesis.
• These cells absorb maximum sunlight for food production.

(ii) Balanced Equation of Photosynthesis: \[ 6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow{\text{Sunlight, Chlorophyll}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \] Conclusion: Palisade mesophyll is responsible for photosynthesis in leaves, and the balanced equation shows conversion of carbon dioxide and water into glucose and oxygen using sunlight.