Page No 61:
Question 1:
How do substances like CO2 and water move in and out of the cell? Discuss.
Page No 63:
Question 1:
Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.
Prokaryotic cell | Eukaryotic cell | ||
1. | Size: generally small ( 1-10 µm) 1 µm== 10-6 m | 1. | Size: generally large (5-100 µm) |
2. | Nuclear region: _____________________________ and is known as ________. | 2. | Nuclear region: well-defined and surrounded by a nuclear membrane |
3. | Chromosome: single | 3. | More than one chromosome |
4. | Membrane-bound cell organelles are absent | 4. | ________________________________________________________________________________________________ |
Page No 65:
Question 1:
Can you name the two organelles we have studied that contain their own genetic material?
Page No 65:
Question 2:
If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
Page No 67:
Question 4:
What would happen to the life of a cell if there was no Golgi apparatus?
Page No 67:
Question 6:
Where do the lipids and proteins constituting the cell membrane get synthesized?
Page No 67:
Question 9:
Carry out the following osmosis experiment:
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed out portions of A and D.
