Q5 of 18 Page 62

Suggested Activities

Place a similar de-shelled egg in a concentrated salt solution for a few minutes. Observe the changes. Record your observations giving reasons.

When a similar de-shelled egg is placed in concentrated salt solution for a few minutes, it shrinks in size. Again due to osmosis, water molecules diffuse out across the semi-permeable to maintain equilibrium. The surrounding salt solution is hypertonic; it has a lower concentration of water, so to maintain equal concentration, water moves out from the egg along the concentration gradient. Thus, egg loses water and shrinks.


More from this chapter

All 18 →
4

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?

 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?

 5

Suggested Activities

Remove the shell of an egg by dissolving it in dilute hydrochloric acid. A thin outer skin now encloses the egg. Put the egg in water. Observe after a few minutes. What is your inference?