Question
Which graph represents the effect of increasing temperature on the rate of diffusion?
▶️Answer/Explanation
Ans D
The correct answer is D, because:
When the temperature increases, the kinetic energy of particles increases causing them to move faster and the diffusion rate increases.
Temperature is directly proportional to the Rate of diffusion, means if temperature increases then diffusion rate also increases.
So, there will be a positive slope on the graph indicating D as correct option.
Question
Which factor would increase the rate of diffusion of oxygen molecules out of a photosynthesizing leaf?
(A) decreasing the concentration gradient
(B) decreasing the distance over which diffusion occurs
(C) decreasing the surface area of the leaf
(D) decreasing the temperature
▶️Answer/Explanation
Ans B
The correct answer is B, because :
Rate of diffusion is directly propotional to Concentration gradient, Surface area, Temperature, i.e., if any of these increases then diffusion rate also increases.
But rate of diffusion is inversely proportional to distance, means it will increase on decreasing the distance.
Question
Which process only involves the movement of water through the partially permeable membrane of a cell?
(A) absorption
(B) evaporation
(C) osmosis
(D) transpiration
▶️Answer/Explanation
Ans C
The correct answer is C (Osmosis), because :
Question
Particles can move into and out of cells by diffusion.
Which statement about diffusion is correct?
(A) Particles move from a region of lower concentration to a region of higher concentration.
(B) Particles only move into cells by diffusion.
(C) The net movement of particles is against a concentration gradient.
(D) The process involves the random movement of particles.
▶️Answer/Explanation
Ans: D
The correct answer is D, because :