Apical meristems

Definition

Apical meristems are regions at the tips of roots and shoots where cells divide rapidly, enabling plants to grow in length. These meristems are crucial for primary growth and the formation of new organs.

5 Must Know Facts For Your Next Test

1. Apical meristems contain undifferentiated cells that allow continuous plant growth.
2. They are responsible for the elongation of stems and roots, contributing to primary growth.
3. Apical meristems produce three primary meristems: protoderm, ground meristem, and procambium.
4. These regions are protected by structures like root caps in roots and leaf primordia in shoots.
5. Hormones such as auxins play a critical role in regulating the activity of apical meristems.

Review Questions

• What types of growth do apical meristems facilitate in plants?
• Name the three primary meristems produced by apical meristems and their respective functions.
• How do hormones influence the function of apical meristems?

Related terms

Primary Growth: The increase in length of the shoot and root due to cell division in apical meristems.

Protoderm: A type of primary meristem that gives rise to the plant’s epidermis.

Auxin: A plant hormone that regulates various aspects of growth and development, including cell elongation in apical meristems.