What will happen when
(i) an egg without shell is placed in concentrated salt solution for 5 minutes.
(ii) an egg without shell is placed in pure / distilled water for 5 minutes. Give reason in brief.

2

(a)

Difference between diffusion and osmosis. Write any two examples where a living organism uses osmosis to absorb water.

2

(a)

How do substances like CO₂ and water move in and out of the cell? Discuss.

2

(a)

Differentiate between prokaryotic cell and eukaryotic cell.

2

(a)

Fill in the gaps in the following table illustration differences between prokaryotic and eukaryotic cells.

Prokaryotic Cell	Eukaryotic Cell
Size: generally small (1-10 μm)	Size: generally large (5-100μm)
Nuclear region:..............................................................and known as.................................................	Nuclear region: well-defined and surrounded by a nuclear membrane.
Chromosome: Single	More than one chromosome.
Membrane-bound cell organelles absent.	...........................................................

2

(a)

Write three main points of cell theory as expressed by Schleiden, Schwann and Virchow.

2

(a)

What would happen to the life of a cell if there was no Golgi apparatus?

2

(a)

What are the functions of Golgi apparatus?

2

(a)

What type of enzymes are present in the lysosomes? What is their function? Which organelles membrane manufacture these enzymes?

2

(a)

(a) Name the organelle which provides turgidity and rigidity to the plant cell. Name any two substances which are present in it.
(b) How are they useful in unicellular organisms?

2

(a)

What is the difference between a unicellular and multicellular organism? How is multicellularity advantageous over uni cellularity?

2

(a)

Which organelle is known as the powerhouse of the cell? Why?

2

(a)

Our body is formed of millions of cells. Now, you can imagine how minute the cells are.We cannot see unicellular bacteria or our cheek cell without the help of microscope.We can see a type of cell with naked eye. These are shelled eggs, for example, egg of a hen. Eggs of a bird after hatching give rise young ones (chick).
With this information, answer the following questions:
(i) Egg of which bird is biggest?
(ii) Why is it said that take one egg daily?
(iii) Why should we not eat more eggs daily for a long period?
(iv) What is your duty after getting this information?

2

(a)

Differentiate between diffusion and Osmosis.

2

(a)

State three differences between plasma membrane and cell wall.

2

(a)