Zoology MCQs
Topic Notes: Zoology
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which group of vertebrates is considered transitional between aquatic and terrestrial environments?
Answer:
amphibians
Amphibians are evolutionary intermediates that bridge the gap between aquatic and terrestrial life. They typically possess aquatic larval stages with gills and terrestrial adult stages with lungs, reflecting their dual adaptation to both water and land environments.
2
In amphibians, where are the poison glands primarily located within the skin structure?
Answer:
dermis
Amphibian skin contains specialized multicellular glands, including mucous and granular (poison) glands. These glands are derived from the epidermis but are embedded within the dermis layer of the skin, where they are supplied by blood vessels and nerves to facilitate their secretory functions.
3
What is the primary protective function of increased keratin production in the skin of amphibians?
Answer:
Ultra Violet (UV) light
Keratin is a fibrous structural protein that provides mechanical strength and protection to the skin. In amphibians, increased keratinization serves as a barrier against environmental stressors, specifically helping to shield underlying tissues from the harmful effects of ultraviolet (UV) radiation, which can cause DNA damage and cellular mutations.