Download 2017 First Term Science Revision sheet (Answer key)

Academic Year 2016- 2017
First Term
Science Revision sheet (Answer key)
Name: ________________________
Grade:6
(A)
Date: _______________
Section: _____________
Science Practice :
Q1: Choose the letter of the choice that best answer the questions:
1. Which of the following is a situation that could lead to the extinction of the
species?
A.
B.
C.
D.
Increased habitat
Increased food supply
Increased competition
Increased population size
2. The following diagram shows one type of living thing
What type of organism is shown in the image?
A.
B.
C.
D.
producer
consumer
decomposer
Neither of above
3. Despite all the fossils that have been found there are gaps in the fossil record.
what are the fossils that help fill in these gaps called?
A.
B.
C.
D.
transitional
Non transitional fossil
Amber fossil
Mold and cast fossil
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4. What type of organism can be found in extreme environment such as hot
springs?
A.
B.
C.
D.
DNA
viruses
archaea
eukaryotes
5. How does a virus use a host to reproduce?
A. The virus only uses a host cell for shelter ;it does not use a host cell to
reproduce
B. The host cell only provides the virus with the food it needs to
reproduce on its own
C. The virus can replicate its own genetic material, but it uses the host
for the process of conjugation.
D. The host cell provides the virus with resources and shelter;its
proteins replicate the genetic material of the virus.
6. Bacteria are found generally in which three shapes?
A.
B.
C.
D.
Sphere, rod, spiral
Polygon, cylinder, sphere
Tube, spiral ,hexagon
Disc, sphere, spacecraft
7. How does the process of binary fission work in the asexual reproduction of
bacteria?
A.
B.
C.
D.
Two cells join to become a larger cell
One cell splits into two cells with identical DNA
DNA material from the environment is added to the cell
Bacteria can only reproduce via sexual reproduction, not asexual
reproduction
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8. What is the function of stems in vascular plants?
A.
B.
C.
D.
They make food for the plants.
They absorb minerals from the soil.
They hold plants in place in the soil.
They support the plants and keep them upright.
9. What is genetic variation?
A.
B.
C.
D.
Organisms have more offspring than can survive.
Offspring have slight differences in their traits.
Some traits increase the chances that an organism will survive.
Overtime, a trait that helps survival will become more common.
10. How many stages are in each plant life cycle?
A.
B.
C.
D.
one
two
three
four
11. What is artificial selection?
A. The process by which humans breed organisms for certain
characteristics.
B. The process by which inherited traits in a population change over
generation.
C. The process by which Charles Darwin noted the differences among
finches on the Galapagos Islands.
D. The process in which individual better adapted to their environment
are more likely to survive and reproduce.
12. What part of a plant’s leaves allows the plants to take carbon dioxide and
release oxygen.
A. stem
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B. cuticle
C. stomata
D. chloroplast
13. Which of the following is the best definition of the word homeostasis?
A.
B.
C.
D.
External condition become unstable as inside condition change.
Internal condition become unstable as outside condition change.
Maintaining stable external conditions when inside condition change.
Maintaining stable internal conditions when outside conditions
change.
14. Which part of plant supply plants with water
A.
B.
C.
D.
Roots
stem
leaves
flower
15. Sam is comparing the embryos of parrotfish and salamanders. Although the
adult organism look very different the embryos follows the similar
developmental pathways. What does this suggest?
A.
B.
C.
D.
That parrotfish and salamanders are found in fossil record.
That parrot fish and salamanders have same genetic makeup.
That parrotfish and salamanders likely share a common ancestor.
That parrotfish and salamanders use their organs for different
function.
16. What are angiosperms?
A. Plants that produce seeds that are not enclosed in a fruit.
B. Plants that produce flowers and fruits which surround and protect
seeds.
C. Non vascular plants
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D. None of above
17. The picture shows a virus. Which of the following is a task the host cell has
during the replication of viruses?
A.
B.
C.
D.
The host cell destroys the virus.
The host cell replicates the virus’s genetic material.
The host cell is destroyed and viral replication stops.
The host cell’s proteins block the replication of
the viral proteins.
18. How do prokaryotes differ from eukaryotes?
A. Prokaryotes have nucleus, while eukaryotes do not.
B. There is no difference between the two types of cells.
C. Prokaryotes are always multicellular ,while eukaryotes are always single
celled
D. Prokaryotes are always single celled, while eukaryotes can be single
celled or multicellular.
19. How do some bacteria survive harsh condition?
A. They attach to a host cell.
B. They change environments.
C. They cannot survive harsh conditions.
D. They encase some part in an endospore.
20. What are two different characteristics that scientists examine to
classify living things?
A.
blood characteristics and naming characteristics.
B.
chemical characteristics and DNA characteristics.
C.
physical characteristics and chemical characteristics.
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D.
physical characteristics and environmental characteristics.
(B):Life Science
Q2: Write (T) in the parenthesis next to the true sentence and ( F) in
the parenthesis next to the false sentence.
1. Binary fission is a form of sexual reproduction in single celled
organisms.
( F
)
2. Plants are multicellular eukaryotes. ( T
)
3. Some bacteria are helpful. ( T )
4. Viruses are not considered living. (
T
)
5. Adaptations can allow a species to survive. ( T
)
Q3: Match each term in column (A) with its definition in column (B)
A
B
Sunlight is an example of
2
One parent makes an identical copy of itself
2
Asexual reproduction
1
stimulus
3
consumers
4
Break down dead organisms to get energy.
4
decomposers
5
Virus
6
Archaea
1
3
7
5
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They eat other organisms to get energy
unicellular
It is made up of genetic material and a protein
coat.
7
Amoeba is
Prokaryotic organisms
6
Q4: Answer the following questions:
1. What did Darwin observed about finches on Galápagos island during
his voyage on the HMS ?
Darwin found that beaks of finches vary in size and shape. He found
that finches that ate insects had long narrow beaks and finches that
ate seeds had shorter ,broad beaks to crush seeds. so, finches that
were born with beaks better suited to the available food supply in their
habitats survived and reproduced.
2. What features of the organism are preserved in amber?
Amber preserves all of organisms features even soft body parts and
wings.
3. List the function of each of the following parts of the flower:
stamen, pistil, ovary and sepal.
Sepals : modified leaves that cover and protect the flower while
it is budding.
Stamen : male reproductive structure of flower.
Pistil : female reproductive structure of flower.
Ovary :Seeds develop in this structure.
4. What is a fossil record?
The fossil record is the history of the organisms that existed in the
geological past, as preserved in fossils.
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Q5.compare between seedless non vascular plants and seedless vascular
plants. How are they similar and different?
Seedless vascular plants
both
Seedless non vascular plants
Ans Textbook: Pg 113
Q13
Q 6. Draw a plant cell and label its parts. Write function of each part of a
cell labeled.
Answer: Textbook Pg 109 Q7
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Q7.Identify and label the following diagram and write about it
Ans: Textbook Pg 80 Q6
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