Which characteristics are correct for both osmosis and diffusion?
▶️ Answer/Explanation
Ans: C
Both osmosis and diffusion involve the movement of particles from a region of higher concentration to lower concentration (passive transport). They do not require energy (ATP) and occur down a concentration gradient.
Option C correctly identifies these shared characteristics, while the other options include incorrect distinctions (e.g., osmosis specifically involves water, and diffusion can occur in gases/liquids). Thus, the answer is C.
The diagram shows apparatus used to investigate osmosis. The volumes of solutions A, B, C and D were the same at the start of the investigation. After one hour, the solutions had moved up the glass tubes. Which solution was the most concentrated at the start of the investigation?
▶️ Answer/Explanation
Ans: D
In osmosis, water moves from a less concentrated solution (hypotonic) to a more concentrated solution (hypertonic). The solution that shows the highest rise in the glass tube (D) indicates the greatest water movement into it, meaning it was the most concentrated at the start.
Thus, the correct answer is D, as it had the highest solute concentration, drawing the most water.