🌍 Diversity in Living Organisms - Complete Chapter Summary
🌿 Introduction to Biodiversity
Biodiversity refers to the variety of living organisms present on Earth, including plants, animals, and microorganisms. Scientists estimate that there are more than 10 million species on Earth, but only about 1.7 million species have been identified and described.
The term Biodiversity was coined by Walter G. Rosen in 1986. Biodiversity helps maintain ecological balance and supports life on Earth.
🦁 Important Biodiversity Concepts
🌏 Megadiversity
Countries with exceptionally rich biodiversity are called megadiverse countries. India is one of the world's 12 megadiversity countries.
🌸 Endemic Species
Species found naturally in only one specific geographic area are known as endemic species.
- 🐐 Nilgiri Tahr
- 🐒 Lion-tailed Macaque
- 🌿 Nepenthes khasiana (Pitcher Plant)
- 💜 Neelakurinji
🔥 Biodiversity Hotspots
Areas rich in endemic species and facing habitat loss are called biodiversity hotspots.
- Western Ghats
- Himalayas
- Indo-Burma Region
- Sunda Land
📚 Classification and Taxonomy
Classification is the process of grouping organisms based on similarities and differences. The science of identification, naming, and classification of organisms is called Taxonomy.
🔍 Basis of Classification
- External Features
- Internal Structure
- Cell Structure
- Mode of Nutrition
- Reproduction
- Genetic Similarity
- Ecological Role
👨🔬 Father of Taxonomy
Carolus Linnaeus is known as the Father of Taxonomy.
🏛️ Five Kingdom Classification
R.H. Whittaker proposed the Five Kingdom Classification in 1969 based on cell structure, body organization, and mode of nutrition.
- 🦠 Monera
- 🧫 Protista
- 🍄 Fungi
- 🌳 Plantae
- 🦁 Animalia
🦠 Kingdom Monera
Monera includes unicellular prokaryotic organisms lacking a true nucleus.
Examples:- Bacteria
- Cyanobacteria
- Mycoplasma
🧫 Kingdom Protista
Protists are unicellular eukaryotic organisms with a true nucleus.
Examples:- Amoeba
- Paramecium
- Euglena
🍄 Kingdom Fungi
Fungi are heterotrophic eukaryotic organisms that absorb nutrients from dead and decaying matter.
Examples:- Yeast
- Rhizopus
- Penicillium
- Mushroom
🌳 Kingdom Plantae
Plants are multicellular autotrophic organisms that prepare their own food through photosynthesis.
🌱 Major Plant Groups
- Thallophyta
- Bryophyta
- Pteridophyta
- Gymnosperms
- Angiosperms
🌼 Angiosperms
Flowering plants with seeds enclosed inside fruits.
🌲 Gymnosperms
Plants with naked seeds and no fruits.
🦁 Kingdom Animalia
Animals are multicellular heterotrophic organisms without cell walls.
📖 Major Animal Phyla
- Porifera 🧽
- Coelenterata 🪼
- Platyhelminthes 🪱
- Nematoda 🪱
- Annelida 🪱
- Arthropoda 🦋
- Mollusca 🐙
- Echinodermata ⭐
- Hemichordata
- Chordata 🐟
🐟 Phylum Chordata
Chordates possess a notochord, dorsal nerve cord, and gill slits during some stage of life.
Vertebrate Classes
- 🐟 Pisces (Fishes)
- 🐸 Amphibia
- 🦎 Reptilia
- 🕊️ Aves (Birds)
- 🐶 Mammalia
📊 Hierarchical Classification
Classification follows a hierarchy from broad to specific groups.
Kingdom → Phylum → Class → Order → Family → Genus → Species
👨 Human Classification
- Kingdom: Animalia
- Phylum: Chordata
- Class: Mammalia
- Order: Primates
- Family: Hominidae
- Genus: Homo
- Species: Homo sapiens
📝 Scientific Naming (Binomial Nomenclature)
Carolus Linnaeus introduced the binomial system of naming organisms.
Every scientific name has two parts:
- Genus Name
- Species Name
Examples
- 🐅 Tiger – Panthera tigris
- 🥭 Mango – Mangifera indica
- 👨 Human – Homo sapiens
❓ Frequently Asked Questions (FAQs)
1. What is biodiversity?
Biodiversity is the variety of living organisms present on Earth, including plants, animals, and microorganisms.
2. Who is known as the Father of Taxonomy?
Carolus Linnaeus is known as the Father of Taxonomy.
3. What are the five kingdoms of classification?
Monera, Protista, Fungi, Plantae, and Animalia.
4. What is an endemic species?
A species found only in a specific geographic region and nowhere else.
5. What is a biodiversity hotspot?
A region rich in biodiversity that faces significant habitat loss.
6. What is binomial nomenclature?
A scientific naming system where each organism receives a two-part name consisting of genus and species.
7. What are chordates?
Animals possessing a notochord, dorsal nerve cord, and gill slits during development.
8. What is the difference between gymnosperms and angiosperms?
Gymnosperms have naked seeds, while angiosperms have seeds enclosed within fruits.
9. Why is classification important?
Classification helps scientists identify, study, compare, and understand relationships among organisms.
10. What is the scientific name of humans?
The scientific name of humans is Homo sapiens.