Transcript Document

1. Energy used by producers in this
grassland food web is provided by __.
A. sunlight
B. water
C. oxygen
D. carbon dioxide
A.Correct. Producers use energy from the
sun to produce food in the form of sugar.
B. Incorrect. Water is a raw material
(reactant) necessary for producing food,
it is NOT energy.
C. Incorrect. Oxygen is a product of
photosynthesis, it is NOT energy.
D. Incorrect. Carbon Dioxide is also a
reactant necessary for photosynthesis, it
is NOT energy.
2. Which of the following is the correct flow
of energy through an ecosystem?
A. Producers
sun
decomposers
B. Sun
consumers
decomposers
C. Sun
producers
consumers
D. Producers
consumers
consumers
producers
decomposers
decomposers
sun
The correct answer is “C”.
• The sun provides energy that producers
use to make food.
• Consumers eat plants or other consumers
to get energy.
• Plants and animals die.
• Decomposers get energy by feeding on
decaying plant and animal matter.
3. A suburban community has a colony of bats that feeds
mainly on the mosquitoes that live in the ecosystem.
Because of the danger of West Nile Virus being spread
by mosquitoes, the community launched a spraying
program to kill the mosquitoes. What effect will this
most likely have on the bat population?
A. The bat population will not be affected.
B. The bat population will decrease because its food
supply will decrease.
C. The bat population will increase because it will find
other things to eat.
D. The bat population will be killed off by the mosquito
spray.
The correct answer is “B”. The bat population is
likely to decrease because of a decrease in the
food supply.
• A Incorrect. The competition for food will be too
great for the population to not be affected.
• C Incorrect. The bat population is unlikely to
find another food source to cause its population
to increase.
• D Incorrect. The mosquito spray is unlikely to
kill off the bats.
4. Because red blood cells are specialized to carry
oxygen, they have no nuclei. What else will be
missing from these cells?
A Cytoplasm
B DNA
C Cell membranes
D Ribosomes
The correct answer is B. Since DNA is
carried in the nucleus, if it were missing, the
cell would be missing its DNA as well.
5. A male rat looses an ear in a fight. What will happen
to his offspring?
A They will inherit the dominant, good ear from their
mother’s chromosomes.
B There is a 50% chance they could be born with a
missing ear.
C They cannot be born with a missing ear, because the
chromosomes in father’s sex cells were not affected.
D All will be born with the missing ear because it is
passed from father to offspring by ear DNA.
X
= ?
The correct answer is C. Traits
can only be passed on to
offspring if they are coded for
in the genetic information.
Only genetic information in the
sex cells will be passed on.
6. WHICH OF THE FOLLOWING HAS
THE hh GENOTYPE?
H
A.
B.
C.
D.
1&3
2
4
NONE
H
4
1
h
3
2
7. WHICH OF THE FOLLOWING IS A TRUE STATEMENT?
A.
B.
C.
D.
h
INDIVIDUAL 4 IS RECESSIVE
INDIVIDUALS 1 & 3 ARE HETEROZYGOUS
INDIVIDUAL 2 IS DOMINANT
ALL INDIVIDUALS ARE FEMALE
6. WHICH OF THE FOLLOWING HAS
THE hh GENOTYPE?
H
A. 1 & 3 Incorrect because both alleles
would have to be recessive (h)
B. 2 Both alleles are recessive (h)
C. 4 Incorrect because both alleles are
dominant (H)
D. NONE
H
h
HH
Hh
4
3
7. WHICH OF THE FOLLOWING IS A TRUE STATEMENT?
A. INDIVIDUAL 4 IS RECESSIVE (Incorrect – dominant)
B. INDIVIDUALS 1 & 3 ARE HETEROZYGOUS (Correct because
one dominant and one recessive allele are present)
C. INDIVIDUAL 2 IS DOMINANT (Incorrect – recessive)
D. ALL INDIVIDUALS ARE FEMALE (Incorrect – not enough
information to determine the sex of the offspring)
h
Hh
1
hh
2
8. IF B IS THE ALLELE FOR BLACK FUR
AND b IS THE ALLELE FOR WHITE
FUR, WHAT PERCENT OF THE
OFFSPRING WOULD BE BLACK?
A.
B.
C.
D.
25%
50%
100%
75%
B
B
BB
b
Bb
b
Bb
bb
9. WHAT FRACTION IS HOMOZYGOUS DOMINANT IN THE ABOVE CROSS?
A.
B.
C.
D.
1/2
1/4
1/3
3/4
8. IF B IS THE ALLELE FOR BLACK FUR AND
b IS THE ALLELE FOR WHITE FUR, WHAT
PERCENT OF THE OFFSPRING WOULD BE
BLACK?
A. 25% (Incorrect because 1 (bb) out of 4 are
white)
B. 50%
C. 100%
D. 75% (white (b) is recessive so it would only
be shown if there are two b alleles present;
black (B) is dominant so when present, it is
shown in the offspring’s appearance)
B
B
b
b
(Black) (Black)
BB
(Black)
Bb
Bb
(White)
bb
9. WHAT FRACTION IS HOMOZYGOUS DOMINANT IN THE ABOVE CROSS?
A. 1/2
B. 1/4 (Because homozygous means both alleles are the same form and
dominant alleles are represented by capital letters)
A. 1/3
B. 3/4
10. IN THIS CROSS, WHAT IS THE
RATIO OF BB TO Bb?
B
A.
B.
C.
D.
3:1
4:1
2:2
0:4
B
B
BB
BB
b
Bb
Bb
10. IN THIS CROSS, WHAT IS THE
RATIO OF BB TO Bb?
B
A. 3 : 1
B. 4 : 1
C. 2 : 2 (Correct because there are 2
BB and 2 Bb)
D. 0 : 4
B
B
BB
BB
b
Bb
Bb
The American bald eagle
* 1500s* Mid 1940s* Mid 1950s* 1960s-
*1970s*1972*1973*1998*2000-
Half a million American bald eagles in U.S.
Widespread use of DDT as insecticide
Steep decline in bird-of-prey populations
“Silent Spring” published; Severe reduction in
hatching of American bald eagle due to soft
shells caused by DDT contamination in the diet.
Only 791 eagle breeding pairs found
U.S. banned the use of DDT as pesticide
Endangered Species Act passed by Congress
6,000 breeding pairs found in North America
Eagle taken off endangered species list
(Breeding pairs)
America Bald Eagle Population
Changes in eagle population from
1500-2000
6500
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
1950
1960
1970
1980
1990
2000
Year
11. Based on the information, which kind of human activity most likely
impacted the environment between the 1950’s-1970’s?
A.
Bird sanctuaries were built by environmentalists
B.
C.
DDT was widely used as a pesticide.
6,000 breeding pairs were found in the U.S.
D.
Endangered Species Act was passed by Congress
11. Based on the information, which kind of human
activity most likely impacted the environment
between the 1950’s-1970’s?
A.
Bird sanctuaries were built by environmentalists
B.
DDT was widely used as a pesticide.
C.
6,000 breeding pairs were found in the U.S.
D.
Endangered Species Act was passed by Congress
During the span of 1950-1970, the population of the American Bald
Eagle dropped significantly, so the only answer choice that would
logically cause a decline in population is B- the use of DDT.