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 hormone is released by the corpora allata in the insect endocrine system?
Answer:
juvenile hormone
The corpora allata are endocrine glands in insects that secrete juvenile hormone. This hormone plays a critical role in regulating metamorphosis and reproduction by preventing the insect from molting into its adult form until it has reached the appropriate developmental stage.
2
In arthropods, which endocrine structure is responsible for the secretion of prothoracicotropic hormone?
Answer:
corpora cardiac
The corpora cardiaca are neurohemal organs in insects that store and release hormones, including prothoracicotropic hormone (PTTH). PTTH stimulates the prothoracic glands to release ecdysone, which triggers molting and metamorphosis in arthropods. Note: The term 'thoracoscopic' in the prompt is likely a misspelling of 'prothoracicotropic'.