Ch 06 - Anatomy of Flowering Plants11th Biology
Primary vs. Secondary Meristems
Which specific meristems are classified as 'Primary' versus 'Secondary', and what are their respective roles in plant growth?
Which specific meristems are classified as 'Primary' versus 'Secondary', and what are their respective roles in plant growth?
- Primary Meristems: Appear early in life and contribute to the formation of the primary plant body (elongation).
- Examples: Apical meristem (root/shoot tips) and Intercalary meristem (between mature tissues, e.g., grasses).
- Secondary (Lateral) Meristems: Appear later in life and strictly increase the girth/thickness of the plant (secondary growth).
- Examples: Fascicular vascular cambium, interfascicular cambium, and cork cambium.
Prism Memory Hook
**A I P** (Apical & Intercalary = Primary) ; **L S** (Lateral = Secondary).
Shoot Apical Meristem Calculation
If a plant twig possesses 4 branches and 26 leaves, how many shoot apical meristems are likely to be present?
If a plant twig possesses 4 branches and 26 leaves, how many shoot apical meristems are likely to be present?
There will be exactly 5 shoot apical meristems. This is because one apical meristem is located at the growing tip of the main axis, and each of the 4 branches will have its own apical meristem at its respective tip. Leaves do not possess shoot apical meristems.
Prism Memory Hook
A premium mnemonic for this topic is available in the Prism App.
Collenchyma: Wall Thickenings
What three specific biochemicals strictly constitute the characteristic thickened corners of Collenchyma cells?
What three specific biochemicals strictly constitute the characteristic thickened corners of Collenchyma cells?
Collenchyma cells have heavily thickened corners due to the deposition of Cellulose, Hemicellulose, and Pectin. Their primary function is to provide mechanical support to the growing parts of the plant, such as the young stem and the petiole of a leaf. Structurally, they are strictly living cells and completely lack intercellular spaces.
Prism Memory Hook
Collenchyma corners are packed with C H P (Cellulose, Hemicellulose, Pectin)
Also in this chapter
32 more cards to study in Prism
- 4Sclerenchyma: Sclereids
- 5Endarch vs. Exarch Primary Xylem
- 6Xylem Fibres & Parenchyma Storage
- 7Phloem Parenchyma Exception
- 8Phloem Fibres (Bast Fibres) Boundary
- 9Gymnosperm Vascular Tissue Exceptions
- 10Exceptions: Absence of Epidermis
- 11Epidermal Appendages: Root Hairs vs. Trichomes
- 12The Stomatal Apparatus
- 13Vascular Bundles: Open vs. Closed
- 14Vascular Bundles: Radial vs. Conjoint
- 15The Stele
- 16Dicot Root: The Casparian Strip
- 17Dicot Root vs. Monocot Root
- 18Hypodermis: Dicot vs. Monocot Stem
- 19Annual Rings: Spring vs. Autumn Wood
- 20Dicot Stem: The Starch Sheath
- 21Dicot Stem: Ring Arrangement
- 22Anatomy of a Monocot Stem
- 23Dorsiventral (Dicot) Leaf Mesophyll
- 24Isobilateral Leaf: Bulliform Cells
- 25Origin of Secondary Meristems
- 26Formation of Vascular Cambial Ring (Stem)
- 27Secondary Growth in Dicot Roots
- 28Secondary Growth: Fate of Primary Tissues
- 29Heartwood vs. Sapwood
- 30Tyloses in Heartwood
- 31The Periderm Components
- 32Botanical Definition of Bark
- 33Lenticels and Gas Exchange
- 34Double Staining of Vascular Tissues
- 35Conifer Wood Exception
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