Question

Q1. Answer questions (a) to (d) on the basis of your understanding of the following paragraph and related studied concepts:

Water also obeys the law of diffusion.The movement of water molecules through such a selectively permeable membrane is called osmosis.The movement of water across the plasma membrane is also affected by the amount of substance dissolved in water.Thus, osmosis is the passage of water from a region of high water concentration through a selectively permeable membrane to a region of low water concentration.

a)Why is plasma membrane called selectively permeable?
b)According to you, which one of the two- cell membrane or cell wall, is more rigid?
c)What will happen when an animal cell is placed in a hypotonic solution as compared to a plant cell in a hypertonic solution?
d)How do unicellular organisms breathe?

Answer 1

Answer:

a. it only allows some things to get through

b. the two cell membrane wall is more rigid

c. the animal cell's insides may be pulled out, while the plant cell would be safer because of it's double membrane structure.

d. unicellular organisms breath by filtering out oxygen from the substance their living in through the cell membrane.

Answer 2

a)प्लाज्मा मेंब्रेन स्कॉलर सिलेक्टिवली परमेबल मेंबराने सिफार्मिक्स द मूवमेंट ऑफ ओनली सचिन मॉलिक्यूल इन एंड आउट ऑफ द cell