Observation

Many candidates attempted this question and performed well.

Candidates were able to state the forms in which cells exist with their examples but lost

majority of the marks to spelling. Although some candidates wrote that cells exist in the soil, water, river instead of stating the forms in which cells exist.

Majority of the candidates could draw the shape of a typical plant cell but lost a lot of marks to inaccurate measurement, title, and other specifications. Some of the candidates drew an animal cell. Many candidates drew guidelines with free-hand and labelled vertically. The guidelines for labels used by some of the candidates were not touching the labels and were crossed.

Some candidates failed to tabulate the answer to 1(c)(i), hence lost one mark. Many candidates answered 1(c)(ii) satisfactorily.

 

            The expected answers are:

 

(a)        (i) Forms in which living cells exist

• Single/free-living;
• Colony/colonial;
• Filamentous/filament;
• Part of a living organism.                                                 

 

(ii) Example

• Single/free-living – Amoeba/Chlamydomonas/Paramecium/Euglena;
• Colony/colonial -  Eudorina/Pandorina/Volvox/sponges;
• Filamentous/filament – Spirogyra/Chladophora/Ulothrix/Zygnema/Oedogonium;
• Part of a living organism – cheek cell/onion cell/epidermal cell/parenchyma cell.

Any correctly named example

NB- Spellings must be correct to score

(b)        Diagram of a typical plant cell

 

Title (TL)                               

           

            Quality (Q)

            Size (Sz) (6cm-10cm)            

Neatness of labels (NL) (Ruled guide lines x ½; Horizontal labels x ½)      

Clarity of lines (CL) (Lines not broken x ½; lines not woolly x ½ )             

 

Details (D)

Definite shape (DS)               

Central large vacuole (CV)

 

Labels (L)

                          (Cellulose) cell wall, chloroplast, vacuole, middle lamella, cytoplasm, nucleus,

                        mitochondrion, (smooth/rough) endoplasmic reticulum, Golgi body, ribosome, cell  

                        membrane.

NB- Spellings must be correct to score         

 

                       

 

(c) (i)   Differences between a plant cell and an animal cell

                       

Plant cell	Animal cell
Has cellulose cell wall/rigid	lacks cellulose cell wall;
-     has one large central vacuole	has numerous/small vacuoles;
-     has chloroplasts	lacks chloroplast;
-     contains starch granules in its cytoplasm	contains glycogen granules in its cytoplasm;
-     usually larger in size	usually smaller in size;
-     does not have lysosome	has lysosome;
-     does not have centrioles/ centrosome	has centrioles/ centrosome
-      has a regular/ definite cell shape	has an irregular/ indefinite cell shape.
-      cytoplasm less dense	cytoplasm more dense
stores lipid as oil	stores lipid as fat

            NB:  Points must correspond to score                                               

            No tabulation minus 1 mark                                                                           NT – 1 mark