Green Colourof the leaves is due to presence of which of the following?

Question

Accepted Answer

The correct option is 3:
The green color of leaves is fundamentally attributed to the presence of Chlorophyll. Chlorophyll is a complex photosynthetic pigment found primarily in the chloroplasts of plant cells. Its primary function is to capture light energy, specifically absorbing light in the red and blue parts of the spectrum while reflecting green light, which is why our eyes perceive leaves as green. This captured energy is vital for photosynthesis, the process by which plants convert carbon dioxide and water into glucose (food) and oxygen. Therefore, Chlorophyll is essential both for the plant's characteristic green appearance and its survival.

The incorrect option is 1:
While carbon is an essential element for life and forms the backbone of all organic molecules in the leaf, including cellulose and sugars, it is colorless. Carbon does not function as a pigment responsible for light absorption or reflection, and thus has no role in determining the visible green color of the leaves.

The incorrect option is 2:
Nitrogen is a critical macronutrient required for the synthesis of proteins, nucleic acids (DNA/RNA), and importantly, chlorophyll itself. A plant deficient in nitrogen will often show signs of chlorosis (yellowing of leaves due to lack of chlorophyll), indicating its necessity for the green pigment's production. However, Nitrogen itself is not the pigment that imparts the green color.

The incorrect option is 4:
Oxygen is a gaseous byproduct of photosynthesis, released by the plant into the atmosphere. It is also utilized by plants during respiration. Like carbon, oxygen is colorless and does not contain any pigment molecules that would be responsible for reflecting or absorbing visible light, and therefore does not cause the green color of the leaves.