Grana
Grana
Grana (pronounced: /ˈɡrænə/), is a term used in the field of biology to refer to the stacks of thylakoids within the chloroplasts of plant cells. The term is derived from the Latin word 'granum', meaning 'grain'.
Etymology
The term 'grana' is the plural form of the Latin word 'granum', which translates to 'grain' in English. This term was chosen due to the grain-like appearance of the thylakoid stacks when viewed under a microscope.
Function
Grana are crucial components of plant cells as they are the sites where photosynthesis occurs. They contain the pigment chlorophyll, which absorbs light energy and uses it to convert carbon dioxide and water into glucose, a process known as the light-dependent reactions of photosynthesis.
Related Terms
- Thylakoid: A membrane-bound compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis.
- Chloroplast: An organelle found in plant cells and eukaryotic algae where photosynthesis occurs.
- Photosynthesis: The process by which green plants and some other organisms use sunlight to synthesize foods with the aid of chlorophyll pigments.
- Chlorophyll: A green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis.
External links
- Medical encyclopedia article on Grana
- Wikipedia's article - Grana
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