Q4 of 18 Page 62

Answer the following questions:

0.9% sodium chloride solution is good and balanced to RBC. A lab technician accidentally places a sample of RBC’s in 1.8% sodium chloride solution. What happens? Why?

0.9% NaCl solution is isotonic with blood. The cells remain unaffected in isotonic solution as they both have equal concentration of solute. 0.9% NaCl solution is good and balanced to RBC.

But when placed in a 1.8% NaCl solution, the RBC shrinks. This happened because 1.8% is hypertonic to RBC. The surrounding hypertonic solution has a higher concentration of solute than the RBC. So water moves out from the RBC along the concentration gradient. As a result, RBC loses water and shrinks.


More from this chapter

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4

Answer the following questions:

List any four differences between a plant cell and an animal cell.

 4

Answer the following questions:

What happens when an empty potato cup is kept in a trough with water? Why?

 4

Answer the following questions:

Diagrams of two different cells are given below. Which one of the two is a plant cell? Support your answer.



(i) Name the parts 1, 2, 3 and 4.


(ii) Write the functions of 1 and 3.


(iii) Draw a diagram to show the structure of 4 and label the parts.


(iv) Draw a diagram of a plant cell and label the parts.

 5

Suggested Activities

Put dried raisins (dry grapes) in a dish with water. What is the change in the raisins after some time? Why?