CSIR NET Life Sciences Diversity Of Life Forms Syllabus

Diversity Of Life Forms syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Diversity Of Life Forms in CSIR NET Life Sciences, not a summary of it.

1. 1

   Principles & Methods of Taxonomy

   3 topics

   • Concepts of Species and Hierarchical Taxa
   • Biological Nomenclature
   • Classical & Quantitative Methods of Taxonomy of Plants, Animals, and Microorganisms
2. 2

   Levels of Structural Organization

   5 topics

   • Unicellular, Colonial and Multicellular Forms
   • Levels of Organization of Tissues, Organs & Systems
   • Comparative Anatomy
   • Adaptive Radiation
   • Adaptive Modifications
3. 3

   Outline Classification of Plants, Animals & Microorganisms

   3 topics

   • Important Criteria Used for Classification in Each Taxon
   • Classification of Plants, Animals, and Microorganisms
   • Evolutionary Relationships Among Taxa
4. 4

   Natural History of Indian Subcontinent

   5 topics

   • Major Habitat Types of the Subcontinent
   • Geographic Origins and Migrations of Species
   • Common Indian Mammals
   • Common Indian Birds
   • Seasonality and Phenology of the Subcontinent
5. 5

   Organisms of Health & Agricultural Importance

   1 topic

   • Common Parasites and Pathogens of Humans, Domestic Animals, and Crops
6. 6

   Organisms of Conservation Concern

   2 topics

   • Rare, Endangered Species
   • Conservation Strategies

Diversity Of Life Forms flashcards for CSIR NET Life Sciences

19 of 50 cards from the Diversity Of Life Forms deck — real questions with worked answers.

1. What is the biological species concept (BSC), and who proposed it?

   Proposed by Ernst Mayr, the BSC defines a species as a group of actually or potentially interbreeding natural populations that are reproductively isolated from other such groups.

2. List the principal obligatory ranks of the Linnaean taxonomic hierarchy from broadest to narrowest.

   Kingdom, Phylum (Division in plants), Class, Order, Family, Genus, Species.

3. In binomial nomenclature, how is a scientific name written, and what does each part denote?

   It has two parts: the genus name (capitalized) followed by the specific epithet (lowercase), both italicized/underlined; e.g., Panthera tigris — genus Panthera, species tigris.

4. Which codes govern the nomenclature of animals, plants, and bacteria respectively?

   Animals: ICZN (International Code of Zoological Nomenclature); Plants/algae/fungi: ICN (formerly ICBN); Bacteria: ICNP (International Code of Nomenclature of Prokaryotes).

5. What is a 'type specimen' (holotype) in taxonomy?

   The single specimen designated by the author as the name-bearing reference to which a species name is permanently attached, anchoring the application of that name.

6. State the Principle of Priority in biological nomenclature.

   The valid name of a taxon is the earliest legitimately published name that conforms to the rules; later synonyms are rejected in favour of the oldest available name.

7. Differentiate between numerical (phenetic) taxonomy and cladistics.

   Numerical/phenetic taxonomy groups organisms by overall similarity using many equally weighted characters; cladistics groups by shared derived characters (synapomorphies) reflecting evolutionary descent.

8. In cladistics, define synapomorphy, plesiomorphy, and homoplasy.

   Synapomorphy: a shared derived character; plesiomorphy: an ancestral character state; homoplasy: similarity arising from convergence/parallelism/reversal rather than common ancestry.

9. Distinguish monophyletic, paraphyletic, and polyphyletic groups.

   Monophyletic: an ancestor and all its descendants (clade); paraphyletic: an ancestor and some descendants; polyphyletic: members from different ancestors grouped by convergent traits.

10. What is a colonial organism, and how does it differ from a multicellular one? Give an example.

    A colonial form is an aggregation of cells (often similar, with limited division of labour) that can survive independently, e.g., Volvox; a multicellular organism has interdependent, differentiated cells forming tissues and cannot survive as isolated cells.

11. Name the four basic animal tissue types.

    Epithelial, connective, muscular, and nervous tissue.

12. Explain the levels of organization: cellular, tissue, organ, and organ-system, with a representative phylum for each.

    Cellular level — Porifera; tissue level — Cnidaria; organ level — Platyhelminthes; organ-system level — from Aschelminthes/Annelida upward in higher Metazoa.

13. Define homologous and analogous structures with examples.

    Homologous: same evolutionary origin, different function (forelimbs of human, whale, bat — divergent evolution); analogous: different origin, similar function (wings of insect and bird — convergent evolution).

14. What is adaptive radiation? Give a classic example.

    Rapid diversification of a single ancestral lineage into many forms exploiting different ecological niches; e.g., Darwin's finches of the Galapagos diversifying by beak/food type.

15. What is convergent evolution, and how does it relate to analogy?

    Convergent evolution is the independent evolution of similar traits in unrelated lineages under similar selection pressures; the resulting similar structures are analogous (e.g., streamlined bodies of sharks and dolphins).

16. Define adaptive modification and give an example in plants.

    An adaptive modification is a structural/physiological change fitting an organism to its environment; e.g., leaves of cactus modified into spines to reduce transpiration in arid habitats.

17. What is the key distinguishing feature used to separate Monera from Protista?

    Monera are prokaryotic (no membrane-bound nucleus/organelles); Protista are eukaryotic (true nucleus and organelles).

18. List the five kingdoms of Whittaker's classification and the basis for the scheme.

    Monera, Protista, Fungi, Plantae, Animalia; based on cell structure (pro/eukaryotic), body organization, mode of nutrition, and phylogenetic relationships.

19. What three domains constitute Carl Woese's classification, and on what molecule is it based?

    Bacteria, Archaea, and Eukarya; based on small-subunit (16S/18S) ribosomal RNA sequence comparisons.

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