The process by which the amount of water and solutes in the blood is controlled is known as

Step 1: Analyze the question The question asks for the name of the process that controls the amount of water and dissolved substances (solutes) in the blood.

Step 2: Explain the concept Organisms must keep the water and salt content of their body fluids within a narrow range. This is called osmoregulation (osmo = osmotic pressure, regulation = control). In humans, the kidneys are the main organs of osmoregulation. They are helped by the hormone ADH (antidiuretic hormone), which adjusts how much water is reabsorbed.

Step 3: Check each option

• A. Hemolysis: This is the bursting of red blood cells, for example when they take in too much water. It is not a control process.
• B. Diffusion: This is the movement of particles from a region of high concentration to a region of low concentration. It is a passive transport process, not the regulation of blood water and solutes.
• C. Turgidity: This is the swollen, firm state of plant cells when they are full of water. It has nothing to do with blood.
• D. Osmoregulation: This is the control of water and solute levels in body fluids, including blood. It matches the question exactly.

Step 4: Answer The correct option is D. osmoregulation.

Tip: Break the word into parts. "Osmo" refers to water and solute balance, and "regulation" means control. Whenever a question says "controlling water and salt levels," think osmoregulation. Also remember that homeostasis is the broad term for keeping the internal environment stable, and osmoregulation is the water and salt part of it.