Structural Organisation In Animals And Plants Revision Notes for Biology NEET

Understanding the structural organisation in animals and plants is essential for appreciating how living organisms are built and how they function at various levels. This chapter explores the external and internal features of both plants and animals, discussing their tissues, organ systems, and adaptations that support their survival. Let’s review these important points for a thorough revision.

Morphology and Modifications in Plants Morphology focuses on the external features of plants, such as roots, stems, and leaves. Roots can be taproot or fibrous and often show modifications for storage (e.g., carrot, radish), support (e.g., banyan prop roots), or respiration (e.g., pneumatophores in mangroves). Stems are aerial or underground and show modifications like rhizome (ginger), tuber (potato), and tendrils for climbing (pea). Leaves are modified for functions like support (pea tendrils), protection (spines in cacti), or storage (onion bulb).

Tissues in Plants and Animals Plants have three major tissue systems: dermal (protection), ground (metabolism and storage), and vascular (transport). The main types of plant tissues are meristematic (actively dividing) and permanent (already differentiated). Meristematic tissues include apical, intercalary, and lateral meristems. Permanent tissues are either simple (parenchyma, collenchyma, sclerenchyma) or complex (xylem and phloem).

In animals, tissues are classified into four types: epithelial (covering surfaces), connective (support and binding), muscular (movement), and nervous tissue (control and coordination). Each tissue type is structurally and functionally specialised.

Anatomy and Functions of Flowering Plant Parts Roots: Roots mainly anchor the plant and absorb water and minerals. They may be modified for storage (sweet potato), respiration (pneumatophores), or support (prop roots in banyan). The root cap protects the root tip. The root’s internal structure includes epidermis, cortex, endodermis, pericycle, and vascular bundles.

Stem: The stem supports buds, leaves, and flowers. It enables transport of water, minerals, and nutrients. Stems also have modifications like tubers, tendrils, and thorns. The anatomy includes epidermis, cortex, cambium, and vascular bundles arranged in specific patterns (ring in dicots, scattered in monocots).

Leaf: Leaves are the main sites of photosynthesis and transpiration. They show adaptations such as leaf tendrils or spines. Internally, a leaf has an upper and lower epidermis, mesophyll (palisade and spongy), and network of veins. Stomata regulate gas exchange and water loss.

Inflorescence: Arrangement of flowers on the stem is called inflorescence. Two main types: cymose (oldest flower at top, e.g., jasmine) and racemose (youngest flower at top, e.g., mustard). Inflorescence type affects plant reproduction strategy.

Flower: The flower is the reproductive organ in angiosperms. Parts include calyx (sepals), corolla (petals), androecium (stamens), and gynoecium (carpels). Flowers ensure fertilisation and seed formation. Variations include unisexual/bisexual, actinomorphic/zygomorphic, and hypogynous/perigynous/epigynous flowers.

Fruit and Seed: Fruit formation follows fertilisation. Fruits protect seeds and aid in their dispersal. Types include simple (mango), aggregate (strawberry), and multiple (pineapple) fruits. Seeds contain the embryo, stored food, and seed coat. They are vital for propagation.

Families of Flowering Plants It is important to know the key features of commonly studied plant families:

• Malvaceae: Hibiscus family; alternate leaves, solitary axillary flowers; stamens form columns.
• Cruciferae (Brassicaceae): Mustard family; cruciform corolla, tetradynamous stamens.
• Leguminosae: Beans and peas; variety of pollination adaptations; roots have nitrogen-fixing bacteria.
• Compositae (Asteraceae): Sunflower family; composite flower heads made of disc and ray florets.
• Gramineae (Poaceae): Grass family; hollow stems, parallel-veined leaves, and spikelets.

Animal Tissues Animal tissues are mainly:

• Epithelial tissue: Forms the protective covering of surfaces and cavities (e.g., skin, lining of gut).
• Connective tissue: Provides support and protection (e.g., bone, blood, cartilage, adipose tissue).
• Muscular tissue: Facilitates movement; types include skeletal, smooth, and cardiac muscles.
• Nervous tissue: Transmits impulses for coordination, found in brain, nerves, and spinal cord.

Morphology, Anatomy, and Functions of Organ Systems in Frog (Insect Model) A frog, commonly used as a model organism, demonstrates the structural details of animal organ systems.

• Digestive System: Includes mouth, buccal cavity, pharynx, oesophagus, stomach, intestine, and cloaca; accessory organs are liver and pancreas. Functions help in food intake, digestion, absorption, and egestion.
• Circulatory System: Closed system; heart has three chambers (two atria, one ventricle). Blood circulates through arteries, veins, and capillaries; also carries lymph.
• Respiratory System: Respiration occurs through skin (cutaneous), lungs (pulmonary), and buccal cavity (buccopharyngeal).
• Nervous System: Comprises brain, spinal cord, peripheral nerves. Controls and coordinates body functions; senses from organs like eye, ear, and skin.
• Reproductive System: Males possess testes located near kidneys, females have ovaries. Fertilisation is external; development includes larval (tadpole) stage.

A handy comparison of plant and animal tissues can help visualise the differences:

Feature	Plant Tissues	Animal Tissues
Types	Meristematic, Permanent	Epithelial, Connective, Muscular, Nervous
Location	Throughout plant body	Throughout animal body
Functions	Support, transport, storage, photosynthesis	Protection, support, movement, coordination

To summarise, understanding the structural organization in plants and animals not only helps us learn about their adaptations but also lays the foundation for more advanced biological concepts. Focus on the morphology, tissue types, organisation of organ systems, and key differentiating features for a solid NEET revision.

NEET Biology Notes – Structural Organisation In Animals And Plants: Quick Revision Guide

These concise NEET Biology notes for the chapter “Structural Organisation In Animals And Plants” help you recall vital topics easily. With a focus on plant tissues, morphology, and organ systems in animals like frogs, these notes are tailored for exam success. Simplified points empower efficient last-minute revision.

Grasping the structure of organisms builds a strong base for NEET questions. Key information on anatomy, tissue types, and major differences between plant and animal systems makes concept retention easier. Use these notes to strengthen your confidence and score better in Biology.