Name: Systematics, Biodiversity and Evolution
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IGNOU MZO-04 (January 2026 – December 2026) Assignment Questions

1.(a) Explain how the principles of evolutionary biology account for antibiotic resistance in bacteria and highlight its broader applications in science and society.
(b) Describe how the Big Bang theory, formation of Earth, and the concept of chemical evolution together explain the origin of life on our planet.

2. Explain the key features and representation of phylogenetic trees, including nodes, branches, root, terminal nodes, outgroup, scaled (phylogram) and unscaled (cladogram) trees, rooted and unrooted trees, polytomy, and monophyletic, paraphyletic, and polyphyletic groups.

3.Describe the key features, variability, and biological significance of bacterial genomes, including operons, plasmids, PHX genes, and adaptations in Deinococcus radiodurans.

4.Explain the role of plasmids in horizontal gene transfer in bacteria, including F, Hfr, and F’ plasmids, and their significance in antibiotic resistance, virulence, and genetic recombination.

5.(a) Explain the two models proposed for the origin of the endoplasmic reticulum (ER) in eukaryotes and discuss how ER evolution is linked to the development of protein secretion pathways and the Golgi apparatus.
(b) Describe how mitosis, meiosis, and sexual reproduction likely evolved in early eukaryotes, and explain how diploidy and meiosis provide survival and genetic diversity advantages.

6.Explain the theory of endosymbiosis and describe how primary endosymbiosis led to the origin of mitochondria and chloroplasts, including gene transfer to the host nucleus and loss of independence of these organelles.

7.(a) Explain the differences between Artificial, Natural, and Phylogenetic systems of classification, giving examples and their importance in studying relationships and evolution of organisms.
(b) Explain the components of taxonomy and describe the different types of taxonomy, including classical, modern, and molecular approaches, with suitable examples.

8.(a) Discuss the role of cyanobacteria in transforming Earth’s early environment and explain how this change influenced the evolution of complex life forms.
(b) Differentiate between catastrophic, mass, and background extinctions with suitable examples from Earth’s history.

9. Discuss the unique anatomical and genetic traits that distinguish modern humans from other hominins and great apes.

10.Describe the following:
a) RNA World hypothesis
b) Molecular drive
c) Evolution of gene families
d) Sympatric speciation

IGNOU MZO-04 (January 2025 – December 2025) Assignment Questions

1. Discuss the evidence supporting the RNA World Hypothesis and its implications for understanding the transition from prebiotic chemistry to cellular life.

2. Discuss the role of horizontal gene transfer in shaping the evolutionary relationships among domains of life.

3. What is the concept of speciation in bacteria, and how does it differ from speciation in eukaryotic organisms?

4. What is the molecular clock? Describe how is it used to estimate the timing of evolutionary events?

5. How did endosymbiosis contribute to the evolution of eukaryotic genomes, and what evidence supports the theory of endosymbiotic origin for organelles like mitochondria and chloroplasts?

6. Describe the role played by genomic changes, such as chromosomal rearrangements, gene duplications, and regulatory divergence, in the process of speciation?

7. What are the key differences between the artificial and natural systems of classification? Differentiate between diploblastic and triploblastic animals based on any five characteristics.

8. What is Taxonomic diversity? Describe its various types.

9. Describe the different stages in the origin of Homo sapiens. Also, draw a well-labeled human evolution tree.

10. Describe the following:

a) Abiogenesis

b) Phylogenetic tree

c) Exon shuffling

d) Artificial speciation

MZO-04 Assignments Details

University	:	IGNOU (Indira Gandhi National Open University)
Title	:	Systematics, Biodiversity and Evolution
Language(s)	:	English
Code	:	MZO-04
Degree	:	MSCZOO
Subject	:	Zoology
Course	:	Core Courses (CC)
Author	:	Gullybaba.com Panel
Publisher	:	Gullybaba Publishing House Pvt. Ltd.

IGNOU MZO-04 (Jan 26 - Dec 26, Jan 25 - Dec 25) - Solved Assignment

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