F4 Biology WS 01 ans

1 Introducing biology

WS 01

Suggested Answers

Textbook exercise (P. 14-16)

M.C.        (4 marks)

1	2	3	4
D	C	D	D

Q. 5                                                                                                                                         (4 marks)

nutrition

excretion

respiration

movement

Q. 6                                                                                                                                         (4 marks)

A	B	C	D
1	4	2	3

Reading to learn

1      The disease is caused by certain chemicals secreted by bacteria.                                        1

        The disease is caused by certain organisms which are smaller than bacteria.                      1

2      The extract of a newly infected plant was still infectious even when the procedure was repeated many times.   1

        This shows that the agent causing the disease was not diluted.                                          1

        This would not happen if the agent was a chemical.                                                           1

3      Reproduction                                                                                                                       1

 (6 marks)