Plant Stem Structure and Functions

The video tutorial covers the internal structures of plant stems, starting with the epidermis, which protects the plant and allows gas exchange. It then explains the cortex and parenchyma, which help maintain plant shape and store food. The vascular bundles, phloem, and xylem are discussed for their roles in transporting nutrients and water. The vascular cambium is highlighted for its role in secondary thickening and plant growth. Finally, the pith and structural support cells, kena and scena, are described for their contributions to plant stability.

What is the primary function of the epidermis in plant stems?

• To store nutrients

• To provide protection

• To produce food

• To transport water

Which layer is found directly beneath the epidermis in plant stems?

• Cortex

• Phloem

• Pith

• Xylem

What is one of the main roles of the cortex in plant stems?

• Transporting water

• Providing structural support

• Storing food

• Photosynthesis

Which vascular bundle is responsible for transporting organic nutrients?

• Phloem

• Xylem

• Cortex

• Epidermis

What is the primary function of xylem in plant stems?

• Storing nutrients

• Transporting water and minerals

• Providing mechanical support

• Transporting sugars

What is the role of the vascular cambium in plant stems?

• To produce more phloem and xylem

• To conduct photosynthesis

• To store water

• To protect the plant

What is secondary thickening in woody plants?

• Increase in girth

• Increase in leaf size

• Increase in height

• Increase in root length

What is the central zone of the stem primarily made up of?

• Epidermal cells

• Parenchyma cells

• Phloem cells

• Xylem cells

Which cell type provides extra mechanical support in new growth regions?

• Kena

• Xylem

• Phloem

• Scena

What is a characteristic of mature scoren cells?

• They are alive at maturity

• They are dead at maturity

• They store nutrients

• They conduct photosynthesis