CALA: LEARNER’S GUIDE
LEARNING AREA:
BIOLOGY
LEVEL:
O’LEVEL
SCHOOL:
SIZANE HIGH SCHOOL
CANDIDATE Name & #:
CALA TYPE:
PEN AND PAPER
TOPIC:
PLANT NUTRITION
CALA TITLE:
EFFECTS OF PESTS ON CROP PRDUCTIVITY
BACKGROUND: As learners you have been assigned to identify and discuss the factors affecting crop
productivity in your local area gardens, with a particular focus on pests’ management. Plant pests are
menacing as they can lead to household hunger and financial losses for farmers. Such pests need to be
identified and classified if they are to be managed most effectively. You are thus required to scan your
locality and discuss the various classes of plant pests.
THE ACTIVITY
You are required to investigate the pests affecting crops in the local area gardens.
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You will describe the factors affecting crop productivity in the locality gardens
You will classify the pests that affect crops in the locality
You will discuss the effects of plant pests on productivity
You will collect samples of affected plant tissues
You will discuss the methods of controlling the pests identified
MARK ALLOCATION
HOW YOU WILL BE ASSESSED
To assess your CALA work, your facilitator will allocate a maximum of 40 marks considered as:

your write-up as outlined in the marking guide up to a maximum of 40 marks.
Mark Allocation across each of the dimensions will be as outlined below:
•
Describing the factors affecting crop productivity in the locality
10
•
Classifying the pests that affect crops in the locality
10
•
Discussing the effects of these plant pests on productivity
10
•
Collecting sample pictures of pests or affected plant tissues
5
•
Discussing the methods of controlling the pests identified
5
CALA TIPS
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You can read your notes
You can search the internet
You can consult other learners, teachers, parents or specialists
ACHIEVEMENT STANDARDS
Achievement standards specific to this CALA are provided below so that you are aware of the
assessment criteria
DIMENSION
Factors
. light
. mineral salts
. temperature
. water
. pests
. diseases
Classifying
. tissue eating
. sap sucking
Effects of pests
. physical impact
on the plant
tissues
. impact on
plant
productivity
Collection of
samples
. samples
attached as leaf,
roots, stem,
fruiting bodies
etc
Pest control
. cultural
methods
. biological
methods
. cultural
methods
. Management
control
A
[9-10]
Learner able to
describe atleast
5 key factors
B
[7-08
Learner able to
describe atleast
3 key factors
C
[5-6]
Learner able to
describe atleast
2 key factors
D
[3-4]
Learner able to
describe atleast
1 key factors
E
[0-2]
Learner not able
to clearly
describe any
factors listed.
[9-10]
Ten pests
correctly
classified
[9-10]
Five pests
correctly
outlined
[7-8]
Eight pests
correctly
classified
[7-8]
Four pests
correctly
outlined
[5-6]
Six pests
correctly
classified
[5-6]
Three pests
correctly
outlined
[3-4]
Four pests
correctly
classified
[3-4]
Two pests
correctly
outlined
[1-2]
Two pests
correctly
classified
[1-2]
One pest
correctly
outlined
[5]
Five affected
plant samples
collected
[4]
Four affected
plant samples
collected
[3]
Three affected
plant samples
collected
[2]
Two affected
plant samples
collected
[1]
One affected
plant sample
collected
[5]
Control
methods for five
pests correctly
suggested
[4]
Control
methods for
four pests
correctly
suggested
[3]
Control
methods for
three pests
correctly
suggested
[2]
Control
methods for
two pests
correctly
suggested
[1]
Control
methods for
only one pest
correctly
suggested