IX : CELL & POLY : TEST 4

IX : CELL & POLY : TEST 4                                            M: 23      S: 24

1.        [1] Full form of ATP.

2.       [2,2,1] Write short note on (a) Nucleus   (b) Plasma membrane (c) Cytoplasm

3.       [2] Why are lysosomes known as suicide bags ?

4.       [1] What would happen if dried raisins are kept in tap water for 10 minutes? Give reason for your answer.

5.       [5] What  is osmosis  ? What  happens to a cell when it is placed in hypotonic, isotonic  and hypertonic solutions respectively. State two points of differences between osmosis  and diffusion. What  is plasmolysis ?

6.       [2,2] Draw  and  label prokaryotic cell.  In what  ways  is it different from  a eukaryotic cell ? (Write  any  two  differences)

7.       [2]  Write  the  composition of a chromosome.   Name  the  part  of a cell where it is formed.

8.       [1,1,2] Which organelle is known as the powerhouse of the cell ? Why ? Draw its labeled diagram ?

9.       [12] Fatorize

a) 25x² + 4y² + 16z² + 20xy – 16yz – 40xz

b) 2x² + y² + 8z² – 2xy + 4 yz – 8xz

c) 27 – 125a³ – 135a + 225a²                                    d) 8x² + 30x – 8   

(e) 18 m² – 8n²                                                          g )  27x³ + y³ + z³ – 9xyz  

10.    [3] If x + 2y + 5 = 0, then find the vslue of  x³ + 8y³ - 30xy + 125

11.    [3] Without actually calculating the cubes, find the value of each of the following:

(i) (–12)³ + (7)³ + (5)³                             (ii) (997) ³                           (iii)    995 x 1005

12.    [3] If  p + q + 10 = 6 , then find the values of     p  ³ +  q³ – 12 pq  + 64  

13.    [1] The coefficient of  x² in ( 3x² – 3x ) (4x + 7 ) is .

14.    [1] Find  the zeros of  x² – 5x – 6