CSS 2024 Zoology Paper

How does homology contribute to mapping phylogeny through a nested hierarchy of characters, and how do scientists use it to understand the evolutionary history of organisms?

Explore the varied lifestyles of unicellular eukaryotes, emphasizing their roles as disease agents, endoparasites, and vital components of the food chain. Assess the impact of these organisms on human health and ecosystems.

Describe the early evolution of chordates. Also, discuss the functional anatomy of tunicates.

Describe the key features of the molluscan body plan. Subsequently, explain the biological and economic impact of ocean acidification on mollusc growth and harvest.

Describe the role of the hypothalamus in endocrine function in vertebrates. Furthermore, explain how the pineal gland directly or indirectly regulates circadian and annual rhythms in animals.

Discuss the key postulates of Darwin's evolutionary theory and analyze the contributions of Mendelian genetics and the chromosomal theory of inheritance in reshaping the evolutionary theory.

Describe the factors involved in regulating digestive system function. Also, outline the types of motilities in each digestive tract segment and the controlling factors for each.