🌿 Kingdom Plantae
Kingdom Plantae includes all eukaryotic, chlorophyll-containing organisms commonly known as plants. Their cells have a eukaryotic structure with prominent chloroplasts and a cell wall primarily made of cellulose.
- Nutrition: While most plants are autotrophic, a few are partially heterotrophic, such as insectivorous plants (e.g., Bladderwort, Venus fly trap) or parasites (e.g., Cuscuta).
- Major Groups: The kingdom includes algae, bryophytes, pteridophytes, gymnosperms, and angiosperms.
- Life Cycle: The life cycle of plants exhibits alternation of generations. This involves two distinct phases: a diploid sporophytic phase and a haploid gametophytic phase that alternate with each other. The lengths of these phases vary among different plant groups.
Kingdom Plantae includes all multicellular, eukaryotic, autotrophic organisms that carry out photosynthesis using chlorophyll. They are the primary producers in most ecosystems.
🧬 General Characteristics
- Cell Type: Eukaryotic and multicellular.
- Cell Wall: Made of cellulose.
- Mode of Nutrition: Autotrophic (photoautotrophic), using chlorophyll pigments.
- Reserve Food: Starch.
- Reproduction: Both asexual (spores, vegetative propagation) and sexual (gamete fusion).
🌱 Classification of Kingdom Plantae
Plantae includes five major divisions (studied in detail in later chapters):
- Thallophyta (Algae) – Simple body, no differentiation (e.g., Spirogyra).
- Bryophyta – Amphibians of the plant kingdom (e.g., Funaria).
- Pteridophyta – Vascular cryptogams (e.g., Fern).
- Gymnosperms – Naked-seeded plants (e.g., Cycas, Pinus).
- Angiosperms – Flowering plants (e.g., Mango, Wheat).
🌾 Economic Importance of Plants
| Useful Role | Example |
|---|---|
| Oxygen production | Green plants via photosynthesis |
| Food and fiber | Cereals, pulses, cotton |
| Medicinal compounds | Rauwolfia serpentina (reserpine) |
| Raw materials | Timber, paper, oils |
🦁 Kingdom Animalia
This kingdom is characterized by heterotrophic, eukaryotic, multicellular organisms whose cells lack cell walls.
- Nutrition: Animals depend directly or indirectly on plants for food. Their mode of nutrition is holozoic, which involves the ingestion of food. They digest their food in an internal cavity and store food reserves as glycogen or fat.
- Growth and Development: They follow a definite growth pattern, growing into adults with a distinct shape and size.
- Motility and Nervous System: Most animals are capable of locomotion. Higher forms show an elaborate sensory and neuromotor mechanism.
- Reproduction: Sexual reproduction occurs through the copulation of male and female, followed by embryological development.
Kingdom Animalia includes all multicellular, eukaryotic, heterotrophic organisms that ingest food. They lack cell walls and chlorophyll and exhibit locomotion at some stage of life.
🧩 General Characteristics
- Cell Type: Eukaryotic and multicellular.
- Cell Wall: Absent.
- Nutrition: Heterotrophic by ingestion.
- Reproduction: Sexual reproduction with gametic fusion.
- Body Organization: Tissues, organs, or organ systems.
🐟🐸🦎🦅🦌 General Features of Vertebrates
- Possess a vertebral column (replacing notochord in adults).
- Cranium encloses the brain.
- Paired appendages (fins or limbs).
- Closed circulatory system with ventral heart.
- Advanced nervous system and sensory organs.
🧠 Summary
| Feature | Plantae | Animalia |
|---|---|---|
| Cell Type | Eukaryotic | Eukaryotic |
| Cell Wall | Cellulose present | Absent |
| Nutrition | Autotrophic | Heterotrophic |
| Motility | Non-motile | Motile |
| Reserve Food | Starch | Glycogen |
| Reproduction | Sexual and asexual | Mostly sexual |
💡 Solved Examples
Q1. Why are green plants called autotrophs?
A1. They synthesize their own food from CO₂ and H₂O using sunlight (photosynthesis).
Q2. What is the reserve food material in plants and animals?
A2. Plants store starch; animals store glycogen.
Q3. Mention two features that differentiate plants from animals.
A3. Plants have cell walls and are autotrophic; animals lack cell walls and are heterotrophic.
Q4. Why are bryophytes called amphibians of the plant kingdom?
A4. They require water for fertilization, similar to amphibians.
Q5. What is the significance of the vertebral column in animals?
A5. It provides support, protection to the spinal cord, and aids in locomotion.