Stem

*Episode 7 of our Botany course focuses on the plant stem. Building on our understanding of plants, photosynthesis, roots, and plant cells, we explore the stem as the crucial axis connecting roots to the rest of the plant. Discover the primary functions of stems: providing structural support, transporting vital water, minerals, and sugars through xylem and phloem tissues, and sometimes storing resources. We'll examine basic stem structure, including nodes, internodes, and buds, and differentiate between primary and secondary growth. Finally, we explore fascinating stem modifications like tubers, rhizomes, and tendrils, showcasing the diverse adaptations of this essential plant organ.*

Check your understanding

These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What are the primary functions of a typical plant stem?

  1. Absorption of water from the air
  2. Providing structural support for leaves and reproductive structures
  3. Transporting water and minerals upwards via phloem
  4. Transporting sugars produced during photosynthesis via xylem
  5. Transporting water/minerals (xylem) and sugars (phloem) between roots and aerial parts
  6. Anchoring the plant in the soil

Which tissue in the stem is primarily responsible for transporting water and dissolved minerals from the roots upwards?

  1. Phloem
  2. Xylem
  3. Epidermis
  4. Cortex
  5. Apical meristem

Primary growth in a stem, which increases its length, originates mainly from the:

  1. Vascular cambium
  2. Cork cambium
  3. Axillary buds
  4. Apical bud (containing the apical meristem)
  5. Root cap

A potato is an example of which type of modified stem, specialized for food storage?

  1. Rhizome
  2. Stolon
  3. Bulb
  4. Tuber
  5. Thorn

Which of the following describes secondary growth in stems?

  1. Increase in stem length
  2. Growth originating only from the apical bud
  3. Formation of branches from axillary buds
  4. Increase in stem diameter (girth) due to lateral meristems (cambium)
  5. Common in herbaceous annual plants
  6. Production of wood (secondary xylem) and bark

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