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Short Notes Anatomy of Flowering Plants - Short Notes for NEET
Meristematic Tissues
| Type | Location | Function |
|---|---|---|
| Apical Meristem | Root & shoot tips | Primary growth (length) |
| Intercalary Meristem | Base of leaves/internodes | Growth in length (grasses) |
| Lateral Meristem | Vascular cambium, Cork cambium | Secondary growth (girth) |
Permanent Tissues
(i) Simple Permanent Tissues
| Tissue | Characteristics | Types/Location | Function |
|---|---|---|---|
| Parenchyma | Living, thin-walled, intercellular spaces | Throughout plant body | Storage, photosynthesis, secretion |
| Aerenchyma | Large air cavities | Aquatic plants | Buoyancy |
| Chlorenchyma | Contains chloroplasts | Leaf mesophyll | Photosynthesis |
| Collenchyma | Living, thickened corners (pectin) | Below epidermis (hypodermis) | Mechanical support, flexibility |
| Sclerenchyma | Dead, thick lignified walls | Mechanical support | |
| • Fibres | Long, narrow cells | Vascular bundles | Tensile strength |
| • Sclereids | Short, isodiametric | Fruit walls, seed coats | Hardness |
(ii) Complex Permanent Tissues
Xylem (Water-conducting)
| Component | Structure | Function |
|---|---|---|
| Tracheids | Dead, elongated, lignified, bordered pits | Water conduction + support (primitive) |
| Vessels | Dead, tube-like, perforated end walls | Efficient water conduction (advanced) |
| Xylem parenchyma | Living, thin-walled | Storage, radial conduction |
| Xylem fibres | Dead, thick-walled | Mechanical support |
Phloem (Food-conducting)
| Component | Structure | Function |
|---|---|---|
| Sieve tube elements | Living, elongated, perforated sieve plates | Food conduction |
| Companion cells | Living, associated with sieve tubes | Help in function of sieve tubes |
| Phloem parenchyma | Living (absent in monocots) | Storage |
| Phloem fibres/Bast fibres | Dead, thick-walled | Mechanical support |
Epidermis
- Single layered outermost covering
- Cuticle: Waxy layer prevents water loss
- Stomata: Guard cells regulate gaseous exchange
- Trichomes: Hair-like structures (protection, reduce transpiration)
- Root hairs: Unicellular extensions for absorption
Dicot Root Anatomy
- Epidermis: Single layer, unicellular root hairs, no cuticle
- Cortex: Parenchymatous, intercellular spaces
- Endodermis: Single layer, Casparian strips (suberin)
- Pericycle: Single/multi-layered, gives rise to lateral roots
- Vascular bundles:Radial arrangement (2-6)
- Xylem: Exarch (protoxylem towards periphery)
- Phloem: Alternate with xylem
- Pith: Small or absent
Monocot Root Anatomy
- Epidermis: Similar to dicot
- Cortex: Well-developed
- Endodermis: With Casparian strips
- Pericycle: Single layer, no secondary growth
- Vascular bundles:Radial, usually more than 6
- Xylem: Exarch
- Pith: Large, well-developed
Dicot Stem Anatomy
- Epidermis: Single layer with cuticle, multicellular hairs, stomata
- Cortex: Collenchyma (hypodermis) + parenchyma
- Endodermis: Starch sheath
- Pericycle: Sclerenchymatous (in patches)
- Vascular bundles:Conjoint, collateral, open (cambium present), arranged in a ring
- Xylem: Endarch (protoxylem towards center)
- Medullary rays: Present between vascular bundles
- Pith: Well-developed, parenchymatous
Monocot Stem Anatomy
- Epidermis: Single layer with cuticle
- Hypodermis: Sclerenchymatous
- Ground tissue: Undifferentiated (no cortex, endodermis, pericycle, pith)
- Vascular bundles:Conjoint, collateral, closed (no cambium), scattered
- Bundle sheath: Sclerenchymatous around each bundle
- Xylem: Endarch, vessels arranged in 'Y' shape
- Phloem: Adjacent to xylem
Dicot Leaf Anatomy (Dorsiventral)
- Upper epidermis: Single layer, cuticle, few/no stomata
- Lower epidermis: More stomata
- Mesophyll:Differentiated into:
- Palisade parenchyma: Upper, vertically elongated, more chloroplasts
- Spongy parenchyma: Lower, loosely arranged, intercellular spaces
- Vascular bundles: Conjoint, collateral, closed
- Bundle sheath: Parenchymatous
- Xylem: Towards upper epidermis
Monocot Leaf Anatomy (Isobilateral)
- Epidermis: Both surfaces similar, stomata on both sides
- Bulliform cells: Large empty cells on upper epidermis (leaf rolling)
- Mesophyll:Not differentiated, uniform chlorenchyma
- Vascular bundles: Conjoint, collateral, closed
- Bundle sheath: Sclerenchymatous
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FAQs on Short Notes Anatomy of Flowering Plants - Short Notes for NEET
| 1. What are the main parts of a flowering plant? |  |
Ans. The main parts of a flowering plant include the root, stem, leaves, flowers, and fruits. The root anchors the plant and absorbs water and nutrients, while the stem supports the plant and transports substances. Leaves are the primary sites for photosynthesis, and flowers are involved in reproduction, leading to the formation of fruits that contain seeds.
| 2. How do flowers contribute to the reproductive process in plants? | |
Ans. Flowers play a crucial role in the reproductive process of flowering plants by facilitating pollination and fertilisation. They contain male structures called stamens, which produce pollen, and female structures known as carpels, which house the ovules. Pollination occurs when pollen is transferred from stamens to carpels, leading to fertilisation and the development of seeds within fruits.
| 3. What is the significance of roots in flowering plants? | |
Ans. Roots are vital for flowering plants as they anchor the plant into the soil, providing stability. They also serve as the primary organ for the absorption of water and essential minerals, which are transported to other parts of the plant. Additionally, roots can store food and energy, ensuring the plant's growth and development during adverse conditions.
| 4. Describe the differences between monocots and dicots. | |
Ans. Monocots and dicots are two major types of flowering plants distinguished by their seed structure and other features. Monocots have one cotyledon, parallel leaf venation, and flower parts typically in multiples of three. In contrast, dicots have two cotyledons, net-like leaf venation, and flower parts usually in multiples of four or five. These differences reflect their evolutionary adaptations and influence their growth patterns.
| 5. What role do leaves play in photosynthesis? | |
Ans. Leaves are essential for photosynthesis as they contain chlorophyll, a pigment that captures sunlight. During this process, leaves take in carbon dioxide from the atmosphere and water from the soil, using light energy to convert these into glucose and oxygen. This not only provides energy for the plant but also contributes oxygen to the environment, making leaves crucial for sustaining life on Earth.
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