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Ast 303: Agro - Meteorology Question Paper
Ast 303: Agro - Meteorology
Course:Bachelor Of Science In Agriculture And Marketing
Institution: Kenyatta University question papers
Exam Year:2010
KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010 ACADEMIC YEAR
3
RD
YEAR 2
ND
SEMESTER
EXAMINATION FOR THE DEGREE OF
STREAM: BACHELOR OF SCIENCE IN AGRICULTURE &
MARKETING
AST 303: AGRO
-
METEOROLOGY
END SEMESTER: II
TIME: 3 HOURS
INSTRUCTIONS
SECTION A:
ANSWER ALL QUESTIONS
–
(40 MARKS)
Q.1)
Distinguish bet
ween the following terms:
a)
Weather and climate
(2 marks)
b)
Adiabatic lapse rate and adiabatic temperature change
(2 marks)
c)
Elnino and Lanina events.
(2 marks)
Q.2)
Explain the following terms:
a)
Adiabatic process
(2 ma
rks)
b)
ITCZ
(2 marks)
c)
Hadley cells
(2 marks)
Q.3)
a)
Outline four environmental variables that define weather and
climate.
(2
marks)
2
b)
Explain how each of the above (Q3a) variables is influenced by
altitude as one ascen
ds from sea level to mount Kenya. (4 marks)
c)
In an international marathon
of September 2006, Mr. Kiplagat ran
from Mombasa stadium, at 34
o
C
and zero meters above sea level
(Asl) to hoist the national flag on mt. Lenana
peak at 40
00m (Asl).
Ass
uming dry weather throughout the race, calculate the
temperature at Mt. Lenana peak, given that for every 100m, the
temperature changed by 0.95
o
C.
(2 marks)
d)
If Mr. Kiplagat ran during the rainy season, calculate the
temperature and rainf
all at Mt. Lenana, given that the rain at
coastal Kenya was 900mm and temperature of 30oC (assume a
moist adiabatic lapse rate of 0.65
o
C
f
or every 100m; and change in
rainfall of 250mm for every 1000m).
(4 marks)
Q.4)
a)
Outline any four physi
cal Laws that explain the behavior of
atmospheric variables of a parcel of air.
(2 marks)
b)
State and express Boyle’s law in an equation form.
(2 marks)
c)
State and express Charle’s law in an equation form.
(2 marks)
d)
Boyle’s and Charle’s l
aws when combined give the equation of
state; write this “equation of state”.
(2 marks)
Q.5)
a)
With the help of a well labeled diagram, show the three states of
water and the processes and energy changes involved as water
changes from one stat
e to another.
(4 marks)
b)
A maize farm measuring 10m x 10 m received 20mm of rain
(Assuming 1mm of rain = 100kg water) in one day leading to water
logging. Assuming incident solar radiation is 25MJ per day per m
2
in that location, and laten
t heat of evaporation is 2.5MJ/kg of water,
calculate the number of days it will take for the farm to dry.
(4 marks)
SECTION B:
ANSWER ANY TWO QUESTONS
–
(30 MARKS)
Q.6)
a)
With the help of a diagram, show how horizontal convergence gives
way to vertical divergence in the global context and the various
processes involved.
(5 marks)
b)
Explain the permanent occurrence of deserts along the latitudes
30
o
and 60
o
to the north and south of equator in relation to
convergence and
divergence.
(5 marks)
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