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ICSE Class 10 · Biology · Chapter 1

Basic Biology

7 topics · 15 questions

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Everything you need, in order

What is Biology?

  • Biology: The scientific study of life and living organisms. Derived from Greek words 'bios' (life) and 'logos' (study).
  • Branches of Biology: Botany (study of plants), Zoology (study of animals), Microbiology (study of microorganisms), Ecology (study of organisms and environment), Genetics (study of heredity).
  • Importance: Understanding life processes, disease prevention, agriculture improvement, environmental conservation, biotechnology applications.

Characteristics of Living Organisms

  • Growth: Increase in size and mass. Irreversible in living organisms. Plants grow throughout life; animals stop after maturity.
  • Nutrition: Process of obtaining and utilizing food. Autotrophic (plants make food) and Heterotrophic (animals consume food).
  • Respiration: Breakdown of food to release energy. Aerobic (with oxygen) and Anaerobic (without oxygen).
  • Excretion: Removal of metabolic waste products. CO₂, urea, sweat are excretory products.
  • Movement: Change in position or place. Animals show locomotion; plants show growth movements (tropisms).
  • Reproduction: Production of new individuals. Sexual (two parents) and Asexual (single parent).
  • Sensitivity/Irritability: Ability to respond to stimuli. Plants respond to light, gravity; animals to touch, sound, light.
  • Adaptation: Features that help organisms survive in their environment. Cactus has spines to reduce water loss.

Classification of Living Organisms

  • Taxonomy: Science of classification. Organisms grouped based on similarities and evolutionary relationships.
  • Five Kingdom Classification: Monera (bacteria), Protista (unicellular eukaryotes), Fungi (decomposers), Plantae (plants), Animalia (animals).
  • Binomial Nomenclature: Two-name system by Carolus Linnaeus. Generic name (genus) + specific name (species). Example: Homo sapiens (humans).
  • Hierarchy: Kingdom → Phylum → Class → Order → Family → Genus → Species.
  • Importance: Systematic organization, easy identification, understanding evolutionary relationships, studying biodiversity.

Cell - The Basic Unit of Life

  • Cell Theory: All living organisms are made of cells. Cell is the basic structural and functional unit of life. New cells arise from pre-existing cells.
  • Proposed by: Schleiden (plant cells), Schwann (animal cells), Virchow (cell division).
  • Types of Cells: Prokaryotic (no nucleus, bacteria) and Eukaryotic (true nucleus, plants and animals).
  • Unicellular vs Multicellular: Unicellular organisms have single cell (Amoeba, bacteria). Multicellular have many cells (humans, plants).
  • Cell Size: Microscopic (1-100 micrometers). Smallest cell: Mycoplasma. Largest cell: Ostrich egg.

Levels of Organization

  • Cell: Basic unit of life. Example: Nerve cell, muscle cell.
  • Tissue: Group of similar cells performing same function. Example: Epithelial tissue, connective tissue.
  • Organ: Group of different tissues working together. Example: Heart, kidney, leaf.
  • Organ System: Group of organs working together. Example: Digestive system, respiratory system.
  • Organism: Complete living being. Example: Human, mango tree.
  • Hierarchy: Cell → Tissue → Organ → Organ System → Organism.

Biodiversity and Conservation

  • Biodiversity: Variety of life forms on Earth. Includes diversity of species, genes, and ecosystems.
  • Importance: Ecological balance, food security, medicines, economic value, aesthetic value.
  • Threats: Habitat destruction, pollution, climate change, overexploitation, invasive species.
  • Conservation: Protection and preservation of biodiversity. In-situ (national parks, sanctuaries) and Ex-situ (zoos, botanical gardens, seed banks).
  • Endemic Species: Species found only in specific geographical area. Example: Lion-tailed macaque in Western Ghats.
  • Endangered Species: Species at risk of extinction. Example: Bengal tiger, Great Indian bustard.

Scientific Method in Biology

  • Observation: Noticing phenomena in nature using senses or instruments.
  • Hypothesis: Tentative explanation based on observations. Must be testable.
  • Experimentation: Testing hypothesis through controlled experiments. Variables: independent, dependent, controlled.
  • Data Collection: Recording observations and measurements systematically.
  • Analysis: Interpreting data using statistics and graphs.
  • Conclusion: Accepting or rejecting hypothesis based on results.
  • Theory: Well-tested explanation supported by multiple experiments. Example: Cell theory, Theory of evolution.

Quiz

Test your knowledge

Multiple choice

  1. Question 1 of 15Knowledge
    The term 'Biology' is derived from which language?
  2. Question 2 of 15Comprehension
    Which of the following is NOT a characteristic of living organisms?
  3. Question 3 of 15Knowledge
    The scientific name of humans is:
  4. Question 4 of 15Knowledge
    Who proposed the Cell Theory?
  5. Question 5 of 15Comprehension
    The correct hierarchy of biological organization from smallest to largest is:
  6. Question 6 of 15Knowledge
    Which kingdom includes bacteria?
  7. Question 7 of 15Knowledge
    Autotrophic nutrition is found in:
  8. Question 8 of 15Knowledge
    The process of removal of metabolic waste from the body is called:
  9. Question 9 of 15Assertion-Reasoning
    Assertion (A): All living organisms respire. Reason (R): Respiration releases energy from food.
  10. Question 10 of 15Comprehension
    Endemic species are those which are:
  11. Question 11 of 15Application
    Which of the following is an example of asexual reproduction?
  12. Question 12 of 15Knowledge
    The smallest living cell is:
  13. Question 13 of 15Comprehension
    In binomial nomenclature, the first name represents:
  14. Question 14 of 15Knowledge
    Which of the following is a characteristic of prokaryotic cells?
  15. Question 15 of 15Knowledge
    The study of heredity and variation is called:

0 of 15 answered