Very Short Answer Questions (50)

1. 1. What is biodiversity?
   The variety of living organisms in all forms and levels of organization found on Earth.
2. 2. Define classification.
   Arranging organisms into groups based on similarities and differences.
3. 3. Give one reason why classification is necessary.
   It helps in identifying and naming organisms systematically.
4. 4. Name the five kingdoms of classification.
   Monera, Protista, Fungi, Plantae and Animalia.
5. 5. What type of organisms are placed in Kingdom Monera?
   Unicellular prokaryotes like bacteria and cyanobacteria.
6. 6. State one feature of Protista.
   Mostly unicellular eukaryotes with a true nucleus (e.g., Amoeba).
7. 7. What is the main nutritional mode of fungi?
   Heterotrophic by absorption (saprophytic or parasitic).
8. 8. Name the kingdom of multicellular photosynthetic organisms.
   Plantae.
9. 9. What defines a species?
   A group of organisms that can interbreed and produce fertile offspring.
10. 10. Give the hierarchical order from kingdom to species.
    Kingdom > Phylum/Division > Class > Order > Family > Genus > Species.
11. 11. What are algae?
    Simple photosynthetic organisms, aquatic, can be unicellular or multicellular.
12. 12. Give one example of a bryophyte.
    Funaria (a moss).
13. 13. What is a pteridophyte?
    A vascular plant that reproduces by spores (e.g., ferns).
14. 14. Define gymnosperm.
    Seed-bearing plants with naked seeds not enclosed in fruits (e.g., Pinus).
15. 15. What is an angiosperm?
    Flowering plants that produce seeds enclosed within fruits.
16. 16. Name one example of a unicellular protist.
    Amoeba.
17. 17. What material makes up fungal cell walls?
    Chitin.
18. 18. What is binomial nomenclature?
    Two-word scientific naming system using genus and species names (e.g., Homo sapiens).
19. 19. Give one characteristic of Porifera.
    Possess pores and channels; simplest multicellular animals (sponges).
20. 20. What is a distinguishing feature of Cnidaria (Coelenterata)?
    Radial symmetry and presence of stinging cells (cnidocytes).
21. 21. Name a flatworm example.
    Planaria (a platyhelminth).
22. 22. What is the body form of nematodes?
    Cylindrical, unsegmented worms (roundworms).
23. 23. State one feature of annelids.
    Segmented body; example: earthworm.
24. 24. What characteristic is typical of arthropods?
    Jointed appendages and an exoskeleton made of chitin.
25. 25. Give one example of a mollusc.
    Snail (Gastropod).
26. 26. What is special about echinoderms?
    Radial symmetry in adults and a water vascular system (e.g., starfish).
27. 27. What defines phylum Chordata?
    Presence of notochord at some life stage; includes fishes, amphibians, reptiles, birds, mammals.
28. 28. Are viruses considered living organisms? Give a short reason.
    No; they are acellular and require host cells to reproduce.
29. 29. What are lichens?
    Symbiotic association between a fungus and an alga or cyanobacterium.
30. 30. Give one role of bacteria in the ecosystem.
    Decomposition of organic matter and nutrient recycling.
31. 31. What is a key difference between monocots and dicots?
    Monocots have one cotyledon; dicots have two cotyledons.
32. 32. Name a plant with parallel venation.
    Grass (a monocot).
33. 33. What is meant by 'habitat'?
    The natural environment where an organism lives and obtains resources.
34. 34. Define 'ecosystem' in one line.
    A community of organisms together with their physical environment interacting as a system.
35. 35. What is autotrophic nutrition?
    Organisms produce their own food (e.g., photosynthesis in plants).
36. 36. What is heterotrophic nutrition?
    Organisms obtain food by consuming other organisms (animals, fungi).
37. 37. Name a photosynthetic bacteria.
    Cyanobacteria (blue-green algae) like Nostoc.
38. 38. What is a distinguishing feature of Kingdom Fungi vs Kingdom Plantae?
    Fungi are heterotrophic and have chitin walls; plants are autotrophic with cellulose walls.
39. 39. What does 'prokaryote' mean?
    Organisms without a membrane-bound nucleus (e.g., bacteria).
40. 40. What does 'eukaryote' mean?
    Organisms whose cells have a true nucleus and membrane-bound organelles.
41. 41. Give an example of a parasitic fungus.
    Puccinia (rust fungus) infecting plants.
42. 42. What is the main mode of reproduction in algae?
    Both sexual and asexual reproduction (varies among groups).
43. 43. Define 'taxonomy' in one sentence.
    The science of naming, describing and classifying organisms.
44. 44. What is meant by 'nomenclature'?
    The system of giving scientific names to organisms.
45. 45. Give one example of a useful fungus.
    Penicillium (source of antibiotic penicillin).
46. 46. Name one aquatic habitat where algae are common.
    Ponds.
47. 47. What is 'alternation of generations' in plants (brief)?
    Life cycle alternating between multicellular haploid and diploid stages (e.g., ferns).
48. 48. State one difference between vertebrates and invertebrates.
    Vertebrates have a backbone; invertebrates lack a backbone.
49. 49. What is an example of a decomposer organism?
    Bacteria or fungi that break down dead organic matter.
50. 50. Mention one way classification helps in study of living organisms.
    It simplifies study by grouping organisms with similar characteristics together.

Use these 50 VSA items for quick revision. They are strictly aligned with NCERT Class 9 — Chapter 13: Diversity in Living Organisms.