Parenchyma
Explanation
Permanent plant tissues are classified into simple and complex tissues based on their structure and function. Simple permanent tissues consist of cells that are structurally and functionally similar. The three main types of simple permanent tissues are Parenchyma, Collenchyma, and Sclerenchyma.
Detailed Analysis
Parenchyma is the most common simple permanent tissue, consisting of living cells with thin cell walls. It serves various functions such as storage, secretion, and photosynthesis. Based on specific functions, parenchyma is further modified:
- Chlorenchyma: When parenchyma cells contain chloroplasts and perform photosynthesis, the tissue is termed Chlorenchyma. It is primarily found in the mesophyll of leaves and the green parts of stems.
- Aerenchyma: In aquatic plants, parenchyma cells develop large air cavities to provide buoyancy; this modification is called Aerenchyma.
Analysis of Incorrect Options:
- Xylem: This is a complex permanent tissue responsible for the conduction of water and minerals. It does not contain chlorenchyma.
- Sclerenchyma: This is a simple permanent tissue composed of dead cells with thick, lignified walls, providing mechanical support. It does not perform photosynthesis.
- Cork: This is a protective tissue formed by the phellogen (cork cambium). Its cells are dead and suberized, preventing water loss and infection.
Key Takeaway
Chlorenchyma is a specialized type of Parenchyma tissue that contains chlorophyll and is responsible for photosynthesis in plants.