Question
The diagram shows the apparatus used in an experiment to demonstrate two processes that take
place in the body.
After one hour, the water outside the dialysis tubing contained reducing sugars.
Which two processes are represented by this experiment?
A absorption and digestion
B absorption and egestion
C digestion and egestion
D digestion and ingestion
▶️Answer/Explanation
Ans: A
The correct answer is A (absorption and digestion), because :
Digestion – Saliva inside the tube breaks the starch into reducing sugars as it contains enzymes.
Absorption – Reducing sugars present in the tube are moved into the outside solution as it diffuses through membrane.
- Egestion is the removal of undigested waste, which is not a part of this experiment.
- Ingestion is the intake of food, which is also not part of this experiment.
Question
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
The correct answer is D, because :
In Osmosis, the water moves from the high water concentrated to low water concentrated solution across semi permeable membrane.
In experiment, Solution D is more concentrated at starting of experiment because,
- Water level in D tube increased indicating that solution in D tube had lowest water concentration (Highly concentrated) comparitively.
Question
Which row shows features of osmosis in cells?
▶️Answer/Explanation
Ans : B
The correct answer is B, because :
Osmosis is movement of water across a semi permeable membrane, from water moving into and out of cell based on solute concentration gradient.
Whereas, Cell wall is not required for osmosis to occur.
Question
Which statement is about osmosis?
(A) movement of water through a partially permeable membrane
(B) movement of sodium ions from a high concentration to a low concentration
(C) movement of sodium ions from a low concentration to a high concentration
(D) requires energy from respiration
▶️Answer/Explanation
Ans: A
The correct answer is A, because :
