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
What structure in Cnidarians facilitates the conduction of impulses throughout the body?
Answer:
nerve net
Cnidarians possess a primitive nervous system known as a nerve net. This diffuse network of neurons allows for the transmission of impulses in multiple directions, enabling the organism to respond to environmental stimuli despite lacking a centralized brain or complex nervous system.
2
Which substances are associated with the nerve cells of Hydra, influencing their physiological activities?
Answer:
growth promoting hormones
Hydra, a cnidarian, possesses a nerve net rather than a centralized brain. Research into cnidarian neurobiology has identified various neuropeptides and growth-promoting factors that regulate processes such as budding, regeneration, and tentacle growth. While Hydra does not possess vertebrate-specific hormones like estrogen or progesterone, growth-promoting substances are essential for their asexual reproduction and cellular maintenance.