SS1 FIRST TERM BIOLOGY PRACTICAL  (MARKING GUIDE)

Marking Guide for Biology Practical SS1

1.(a) Specimen A is crab [1 mark]

Reasons are:

• Exoskeleton
• Cephalothorax
• A pair of stalked eyes
• Two large claws [any 1 × 1 = 1 mark]

Specimen B is earthworm  [1 mark]

Reasons are:

• Segmented body
• Clitelium [any 1 × 1 = 1 mark]

Specimen C is Agama lizard [1 mark]

Reasons are:

• Orange-coloured head and tail
• Scales
• Nuchal crest [any 1 × 1 = 1 mark]

1.(b) Classification of specimens A, B and C

(i) Specimen A

Phylum is Arthropoda  [1 mark]

Class is Insecta  [1 mark]

(ii) Specimen B

Phylum is Annelida  [1 mark]

Class is Oligochaeta  [1 mark]

(iii) Specimen C

Phylum is Chordata  [1 mark]

Class is Reptilia  [1 mark]

1.(c) Features of Specimen A are:

• It possesses exoskeleton
• Head and thorax are fused to form cephalothorax
• It has a pair of stalked eyes
• It has two large claws   [Any 3 × 1 = 3 marks]

Features of specimen B are:

• It has segmented body
• it possesses clitelium
• mouth and anus are present
• soft and moist/wet body  [Any 3 × 1 = 3 marks]

Features of specimen C are:

• scales present
• nuchal crest present
• gular fold present
• tail present
• two pairs of legs  [Any 3 × 1 = 3 marks]

1.(d) Habitat of specimen B/earthworm

• moist/damp/wet soil, fresh water [2 marks]

Habitat of specimen C/Agama lizard

• crevices, roof top, wall, incomplete building [2 marks]

2.(a) Identification

(i) Specimen D is maize leaf  [1 mark]

(ii) Specimen E is cashew leaf  [1 mark]

(iii) Specimen F is housefly  [1 mark]

2.(b) Observable differences between D and E  [4 marks]

2.(c) Specimen F/Housefly

Phylum is Arthropoda  [1 mark]

Class is Insecta  [1 mark]

Division of specimen D and E is Spermatophyta  [1 mark]

2.(d) Reasons for placing F/housefly in the class Insecta

• It has three body regions/head, thorax and abdomen
• It has wings
• It has six legs/3 pairs of legs
• It has an exoskeleton

[Any 3 × 2 = 6 marks]

2.(d) Drawing of specimen E/Cashew leaf

Magnification (× ½)

Title = 1 mark

Size = 1 mark

Mag.