F4 Biology WS 03 ans

2 The cell I

WS 02 03

Suggested Answers

Textbook exercise (P. 33-137)

M.C.        (4 marks)

1	2	3
D	C	B

Q. 9                                                                                                                                         (4 marks)

(b)

(i)     Make the cellular structures more prominent (1).

(ii)    Cover the tissues with a cover slip (1).

Q. 10                                                                                                                                       (4 marks)

10        a     

Eyepiece	Objective	Total magnification
10X	10X	100X
10X	20X	200X
10X	40X	400X

                                                                                                                                                     1

    b      i       2.8 mm/7 μm                                                                                                        1

                        = 400                                                                                                                    1

                ii      Plant cells are larger than animal cells.                                                                 1

Q.12

12        a      Advantages:

                It can be used to see ultra-structures. /

                It can produce images with higher magnifications. /

                It can produce images with higher resolution. / It has a higher resolving power.

                (any 2)                                                                                                                    1 x 2

                Disadvantages:

                The cost is high. /

                It is difficult to operate. /

                The preparation of specimens is complex. /

                Living material cannot be viewed. (any 2)                                                             1 x 2

        b      i       47 mm                                                                                                                  1

                ii      47 mm/6800                                                                                                         1

                    = 6.91 μm                                                                                                             1

        c      i       Mitochondrion                                                                                                     1

                ii      It is the main site where respiration takes place.                                                  1