Observation

Candidates were able to correctly identify organisms A and B, but some lost marks to poor spellings.
Some candidates could also name the parts labelled I and X but lost marks to poor spellings too.
Many candidates could not correctly name the Class of organism A and hence, they could not give the reason for the classification.
Some candidates could not state observable adaptive features of organism A for movement in water, neither could theystate two observable adaptive features of organism B to its mode of life.

Candidates could not correspond answers on differences, making them lose the marks allotted to the question.

The expected answers are:

(a)(i)    Identification of Organism
A - Tilapia/snapper/Correctname of bony fish with scales
B -Tadpole

                                                                                   
(ii)    Name of Labelled Parts
I:         Nostril;
II:        Scale;                          
III:       Dorsal fin;
IV:       Lateral fin;
V:        Tail/Caudal fin;
VI:       Tail;                      
VII:     Anal Fin;
VIII:   Pelvic fin;
IX:       Pectoral fin;
X:        Operculum/gill cover.
                                                                                                           
(b)(i)    Class of Organism A
                        Osteichthyes

(ii)   Reasons for Class of Organism A
-           rayed fins;
-           mouth is terminal;
-           overlapping scales;
-           presence of operculum;
-           heterocercal tail.

(c)(i)    Adaptive Features of Organism A for Movement

• Muscular/tail/; for movement, forward propulsion;
• Streamlined body shape; for easy movement in water;
• overlapping/flat scales;to reduce friction in water;
• fins; for movement and balance.

                                                                                                                       
(ii)     Adaptive Features of Organism B
-           tails; for swims
-           streamlined body; for easy movement in water;
-           external gill; for gaseous exchange.

(d)(i)    Similarities Between Organism A and B
-           both have streamlined body;
-           both possess tail;
-           both have eye;
-           both have nostril.

(ii)      Differences Between Organisms A and B