RNR 2102 MAIN EXAMINATION SET 2026/2027
QUESTIONS AND SOLUTIONS RATED A+
✔✔(T or F) Rotenone kills fish that cannot be consumed later because of poisonous
residue - ✔✔T
✔✔(T or F) Primacord is the brand name of a toxicant for killing fish. - ✔✔F; it's a
detonating cord of pentaerythrivol tetranitrate (PETN) which is an explosive
✔✔Identify the following as active or passive nets
a. Seines
b. Gill nets
c. Hoop nets
d. Trawls
e. Fyke nets - ✔✔a. active
b. passive
c. passive
d. active
e. passive
✔✔Which of the following items is not measured by a hydrolab?
a. Water temperature.
b. Substrate physical properties
b. Conductivity.
c. pH.
d. Dissolved oxygen. - ✔✔b
✔✔Secchi disk is used to measure water
a. temperature.
b. turbidity
c. conductivity.
d. pH. - ✔✔b
✔✔What is the biggest problem in sampling animal populations? - ✔✔Animal
populations are constantly moving
✔✔On Monday, we trapped 50 raccoons, marked them, and returned them to where
they lived. On the next Monday, we caught 75 raccoons, 15 of them were marked. How
many raccoons lived in this tract? - ✔✔250 raccoons (used the Lincoln-Peterson index)
✔✔Which of the following assumptions is not true in the Mark-Recapture method?
a. Population is closed (no birth, death, emigration, nor immigration).
b. All animals have the same probability of being caught.
c. Marking affects the chance of catching the animal at time 2.
, d. Animals do not lose their marks. - ✔✔c; marking does not change probability of being
caught
✔✔We sampled catfish for four consecutive days, catching fish, mark them, and return
them to the pond. Estimate the catfish population based on the following data. (see
sheet) - ✔✔(see sheet)
✔✔ Given that the dot grids contain 25 dots per square inch, and that the scale of the
map is 4 inches to the mile, compute area in acres of a tract covering 450 dots. -
✔✔720 ac
✔✔Calculate radius of a 0.2-acre circular plot. - ✔✔52.660 ft
✔✔Given the following volume table and the total tree tally on 12 plots of 0.1-ac each,
compute trees/acre, basal area/acre, and volume/acre. (see sheet) - ✔✔Trees/ac =
208.333 trees/ac
Basal area/ac= 53.631 sq.ft./ac
Volume/ac= 12.217 cords/ac
✔✔What do the following acronyms stand for? GIS, GPS, PDOP, NAD27, NAD83,
WGS84, UTM, DEM, DOQQ, SA - ✔✔GIS: Geographic Information System
GPS: Global Positioning System
PDOP: Positional Dilution of Precision
NAD27: North American Datum of 1927
NAD83: North American Datum of 1983
WGS84: World Geodetic System of 1984
UTM: Universal Transverse Mercator
DEM: Digital Elevation Models
DOQQ: Digital Orthophoto Quarter Quadrangles
SA: Selective Availability
✔✔T or F? GIS is a computerized system for making maps - ✔✔F
✔✔T or F? GIS is a tool for storing maps and pictures. - ✔✔F
✔✔T or F? GIS is a computer-based system to store, manipulate, and output
geographical data. - ✔✔T
✔✔T or F? GPS units used by the military have higher PDOP than normal GPS units. -
✔✔F; military has lower PDOP (small PDOP value is good)
✔✔T or F? GPS works better during the day, when the clouds help improve the signals.
- ✔✔F; clouds do not improve signals; avoid collecting data in forested environment
during/after imm. rainfall
QUESTIONS AND SOLUTIONS RATED A+
✔✔(T or F) Rotenone kills fish that cannot be consumed later because of poisonous
residue - ✔✔T
✔✔(T or F) Primacord is the brand name of a toxicant for killing fish. - ✔✔F; it's a
detonating cord of pentaerythrivol tetranitrate (PETN) which is an explosive
✔✔Identify the following as active or passive nets
a. Seines
b. Gill nets
c. Hoop nets
d. Trawls
e. Fyke nets - ✔✔a. active
b. passive
c. passive
d. active
e. passive
✔✔Which of the following items is not measured by a hydrolab?
a. Water temperature.
b. Substrate physical properties
b. Conductivity.
c. pH.
d. Dissolved oxygen. - ✔✔b
✔✔Secchi disk is used to measure water
a. temperature.
b. turbidity
c. conductivity.
d. pH. - ✔✔b
✔✔What is the biggest problem in sampling animal populations? - ✔✔Animal
populations are constantly moving
✔✔On Monday, we trapped 50 raccoons, marked them, and returned them to where
they lived. On the next Monday, we caught 75 raccoons, 15 of them were marked. How
many raccoons lived in this tract? - ✔✔250 raccoons (used the Lincoln-Peterson index)
✔✔Which of the following assumptions is not true in the Mark-Recapture method?
a. Population is closed (no birth, death, emigration, nor immigration).
b. All animals have the same probability of being caught.
c. Marking affects the chance of catching the animal at time 2.
, d. Animals do not lose their marks. - ✔✔c; marking does not change probability of being
caught
✔✔We sampled catfish for four consecutive days, catching fish, mark them, and return
them to the pond. Estimate the catfish population based on the following data. (see
sheet) - ✔✔(see sheet)
✔✔ Given that the dot grids contain 25 dots per square inch, and that the scale of the
map is 4 inches to the mile, compute area in acres of a tract covering 450 dots. -
✔✔720 ac
✔✔Calculate radius of a 0.2-acre circular plot. - ✔✔52.660 ft
✔✔Given the following volume table and the total tree tally on 12 plots of 0.1-ac each,
compute trees/acre, basal area/acre, and volume/acre. (see sheet) - ✔✔Trees/ac =
208.333 trees/ac
Basal area/ac= 53.631 sq.ft./ac
Volume/ac= 12.217 cords/ac
✔✔What do the following acronyms stand for? GIS, GPS, PDOP, NAD27, NAD83,
WGS84, UTM, DEM, DOQQ, SA - ✔✔GIS: Geographic Information System
GPS: Global Positioning System
PDOP: Positional Dilution of Precision
NAD27: North American Datum of 1927
NAD83: North American Datum of 1983
WGS84: World Geodetic System of 1984
UTM: Universal Transverse Mercator
DEM: Digital Elevation Models
DOQQ: Digital Orthophoto Quarter Quadrangles
SA: Selective Availability
✔✔T or F? GIS is a computerized system for making maps - ✔✔F
✔✔T or F? GIS is a tool for storing maps and pictures. - ✔✔F
✔✔T or F? GIS is a computer-based system to store, manipulate, and output
geographical data. - ✔✔T
✔✔T or F? GPS units used by the military have higher PDOP than normal GPS units. -
✔✔F; military has lower PDOP (small PDOP value is good)
✔✔T or F? GPS works better during the day, when the clouds help improve the signals.
- ✔✔F; clouds do not improve signals; avoid collecting data in forested environment
during/after imm. rainfall
