🌿 Morphology of Flowering Plants (Root, Stem & Leaf)
| Category / Modification | NCERT Examples | Key High-Yield Feature |
|---|---|---|
| Tap Root System | Mustard plant | Primary root arises from the radicle. |
| Fibrous Root System | Wheat plant | Roots originate from the base of the stem. |
| Adventitious Roots | Grass, Monstera, Banyan tree | Roots arise from parts other than the radicle. |
| Prop Roots | Banyan tree | Hanging structures providing mechanical support. |
| Stilt Roots | Maize, Sugarcane | Arise from the lower nodes of the stem. |
| Pneumatophores | Rhizophora (Swampy areas) | Grow vertically upwards to get oxygen for respiration. |
| Underground Stem Storage | Potato, Ginger, Turmeric, Zaminkand, Colocasia | Organs of perennation to tide over unfavorable conditions. |
| Stem Tendrils | Gourds (Cucumber, Pumpkin, Watermelon), Grapevines | Slender, spirally coiled structures developed from axillary buds. |
| Stem Thorns | Citrus, Bougainvillea | Woody, straight, and pointed structures for defense. |
| Phylloclade (Photosynthetic Stem) | Opuntia (Flattened), Euphorbia (Fleshy cylindrical) | Stems contain chlorophyll and perform photosynthesis in arid zones. |
| Leaf Tendrils | Peas | Leaves modified for climbing. |
| Leaf Spines | Cacti (Opuntia) | Modified for defense; reduces transpiration. |
| Fleshy Storage Leaves | Onion, Garlic | Store food materials. |
| Phyllode (Modified Petiole) | Australian Acacia | Petioles expand, turn green, and synthesize food as leaves are short-lived. |
| Insectivorous Leaves | Pitcher plant, Venus fly trap | Modified leaves used to catch insects for nitrogen needs. |
🌸 Morphology of Flowering Plants (Inflorescence, Flower & Families)
| Category / Symmetry | NCERT Examples | Key Botanical Detail |
|---|---|---|
| Racemose Inflorescence | Radish, Mustard, Lupin | Main axis continues to grow; flowers borne acropetally. |
| Cymose Inflorescence | Solanum, Jasmine, Calotropis | Main axis terminates in a flower; flowers borne basipetally. |
| Actinomorphic (Radial) | Mustard, Datura, Chilli | Flower can be divided into two equal halves in any radial plane. |
| Zygomorphic (Bilateral) | Pea, Gulmohur, Bean, Cassia | Flower can be divided into identical halves only in one vertical plane. |
| Asymmetric (Irregular) | Canna | Cannot be divided into two similar halves by any plane. |
| Valvate Aestivation | Calotropis | Sepals or petals meet at the margins without overlapping. |
| Twisted Aestivation | China rose, Lady's finger, Cotton | One margin of the appendage overlaps that of the next one. |
| Imbricate Aestivation | Cassia, Gulmohur | Margins overlap but not in any particular direction. |
| Vexillary (Papilionaceous) | Pea, Bean | Five petals: Largest (Standard), two lateral (Wings), two anterior (Keel). |
| Apocarpous Carpels | Lotus, Rose | Carpels are free from each other. |
| Syncarpous Carpels | Mustard, Tomato | Carpels are fused together. |
| Marginal Placentation | Pea | Placenta forms a ridge along the ventral suture of the ovary. |
| Axile Placentation | China rose, Tomato, Lemon | Placenta is axial and the ovules are attached to it in a multilocular ovary. |
| Parietal Placentation | Mustard, Argemone | Ovules develop on the inner wall of the ovary or peripheral part. |
| Free Central Placentation | Dianthus, Primrose | Ovules are borne on a central axis and septa are absent. |
| Basal Placentation | Sunflower, Marigold | Placenta develops at the base of the ovary and a single ovule is attached. |
| Fabaceae (Pea Family) | Gram, Arhar, Sem, Moong, Soyabean, Indigofera, Sunnhemp, Sesbania, Trifolium, Licorice | Plants yield pulses, edible oil, dye, fibres, fodder, and medicine. |
| Solanaceae (Potato Family) | Potato, Tomato, Brinjal, Chilli, Belladonna, Ashwagandha, Tobacco, Petunia | Plants yield food, spices, medicines, fumigatories, and ornamentals. |
| Liliaceae (Lily Family) | Tulip, Gloriosa, Aloe, Asparagus, Colchicum (Colchicum autumnale) | Monocot family; includes ornamentals, medicine, vegetables, and colchicine. |
🔬 Anatomy of Flowering Plants
| Tissue Type / Structure | NCERT Examples / Features | Key High-Yield Detail |
|---|---|---|
| Simple Permanent Tissues | Parenchyma, Collenchyma, Sclerenchyma | Basic structural units of plant organs. |
| Collenchyma Locations | Hypodermis of Dicot stems | Found as a homogenous layer or in patches; absent in monocots. |
| Sclereids (Sclerenchyma) | Fruit walls of nuts; pulp of guava, pear, sapota; seed coats of legumes | Spherical or oval thick-walled dead cells with narrow lumens. |
| Complex Permanent Tissues | Xylem (Tracheids, Vessels, Xylem Fibres, Xylem Parenchyma) Gymnosperms lack vessels | Vessels are a characteristic feature of Angiosperms. |
| Phloem Components | Sieve tubes, Companion cells, Phloem parenchyma, Phloem fibres | Gymnosperms lack sieve tubes and companion cells (have albuminous cells instead). |
| Phloem Parenchyma Absence | Most Monocotyledons | Absent in monocot stems and leaves. |
| Dicot Stem Anatomy | Collenchymatous hypodermis; Ring arrangement of vascular bundles; Conjoint, collateral, open | Ring-like arrangement of vascular bundles is a diagnostic feature. |
| Monocot Stem Anatomy | Sclerenchymatous hypodermis; Scattered vascular bundles; Conjoint, collateral, closed | Peripheral vascular bundles are generally smaller than central ones. |
| Isobilateral (Monocot) Leaf | Bulliform cells present in epidermis | Large, empty, colorless cells in grasses that control leaf rolling during water stress. |
🐸 Structural Organisation in Animals (Tissue Locations & Frog)
| Tissue Type | Specific NCERT Locations | Structural Shape / Feature |
|---|---|---|
| Squamous Epithelium | Walls of blood vessels, air sacs (alveoli) of lungs | Single thin layer of flattened cells with irregular boundaries. |
| Cuboidal Epithelium | Ducts of glands, tubular parts of nephrons in kidneys | Single layer of cube-like cells; microvilli present in PCT of nephron. |
| Columnar Epithelium | Lining of stomach and intestine | Single layer of tall and slender cells; helps in secretion and absorption. |
| Ciliated Epithelium | Inner surface of hollow organs like bronchioles and fallopian tubes | Columnar or cuboidal cells bearing cilia on their free surface. |
| Exocrine Glands | Mucus, saliva, earwax, oil, milk, digestive enzymes glands | Mucus glands are unicellular (Goblet cells); Salivary glands are multicellular. |
| Endocrine Glands | Pituitary, Thyroid, Adrenal glands | Ductless glands; secrete hormones directly into the fluid bathing the gland. |
| Tight Junctions | Epithelial sheets | Help to stop substances from leaking across a tissue. |
| Adhering Junctions | Epithelial sheets | Perform cementing to keep neighboring cells together. |
| Gap Junctions | Cardiac muscle cells, neurons | Facilitate the cells to communicate with each other by connecting cytoplasm. |
| Areolar Tissue (Loose Connective) | Beneath the skin | Serves as a support framework for epithelium. |
| Adipose Tissue (Loose Connective) | Beneath the skin | Specialized to store fats; excess nutrients are converted into fat here. |
| Dense Regular Connective | Tendons (Bone to Muscle), Ligaments (Bone to Bone) | Collagen fibres are present in rows between many parallel bundles. |
| Dense Irregular Connective | Skin dermis | Fibroblasts and many fibres are oriented irregularly. |
| Specialized Connective Tissue | Cartilage, Bone, Blood | • Cartilage: Chondrocytes enclosed in small cavities. • Bone: Osteocytes present in spaces called lacunae. |
| Frog (Rana tigrina) Key Values | • Heart: 3-chambered (2 atria, 1 ventricle) • Erythrocytes: Nucleated with haemoglobin • Respiration: Cutaneous (skin) and Pulmonary (lungs) • Brain ventricles: Optic lobes are prominent | Poikilothermic (cold-blooded) amphibian; exhibits mimicry and aestivation/hibernation. |