Biology MCQs
Topic Notes: Biology
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
251
What is the term for the outer, dark red region of the kidney?
Answer:
renal cortex
The kidney is anatomically divided into an outer renal cortex and an inner renal medulla. The renal cortex is the granular, dark red outer layer that contains the glomeruli and convoluted tubules, where the initial stages of blood filtration occur.
252
What is the term for a solution that results in the production of concentrated urine due to low water content in body fluids?
Answer:
hypertonic
A hypertonic environment is characterized by a higher solute concentration compared to the intracellular fluid. In the context of the renal system, when body fluids are hypertonic, the kidneys conserve water by reabsorbing it, resulting in the excretion of highly concentrated urine to maintain osmotic balance.