Study the diagrams below on a water culture experiment using young maize plants and use it to
answer questions 4(a) to 4(e).
Diagram
(a) (i) Name the parts labelled I to VI in diagram B
I. .............................................................. IV. ...........................................................
II. ............................................................. V. ...........................................................
III. ............................................................ VI. .............................................................[3 marks]
(ii) What is the function of the part labelled IV?
.....................................................................................................................................................
........................................................................................................................................[2 marks]
(iii) What is the importance of pumping air into the part labelled VI?
.....................................................................................................................................................
........................................................................................................................................[2 marks]
(b) (i) Name
four major inorganic ions that will be contained in the part labelled VI in
diagram B.
.....................................................................................................................................................
..................................................................................................................................................
.....................................................................................................................................................
........................................................................................................................................[4 marks]
(ii) Outline the process by which the effect of one of the major inorganic ions named in
4(b)(i) above on the maize plant can be investigated .
.....................................................................................................................................................
..................................................................................................................................................
.....................................................................................................................................................
........................................................................................................................................[5 marks]
(c) (i)
State two observable differences between the plants in diagrams A and B.
.....................................................................................................................................................
........................................................................................................................................[2 marks]
(ii) State two reasons for the differences observed in 4( c )(i) above .
.....................................................................................................................................................
........................................................................................................................................[2 marks]
(d) (i) State the function of the part labelled II in diagram B.
........................................................................................................................................[1 mark]
(ii) State one reason why the part labelled II in diagram B should be kept dry.
........................................................................................................................................[1 mark]
(iii) State three factors that should be kept constant in the environment for the experiment
to be successful.
.....................................................................................................................................................
....................................................................................................................................................
........................................................................................................................................[3 marks]
(e) (i)
State the class of the plant in diagram B.
........................................................................................................................................[1 mark]
(ii) Give four reasons for placing the plant in the class stated in 4(e)(i) above
.....................................................................................................................................................
....................................................................................................................................................
........................................................................................................................................[4 marks]