Hl Life Science Final Exam

31 Questions | By Penteam | Last updated: Jan 15, 2013 | Total Attempts: 140

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End of year exam for 6-8th grade Life Science.

Questions and Answers

1.

Avery collected the gas given off by a glowing piece of charcoal. The Gas was then bubbled through a small amount of colorless limewater. Part of Avery’s report stated, "After the gas was put into the jar, the limewater gradually changed to a milky white color." This statement is:
- A.
  
  An observation
- B.
  
  A conclusion
- C.
  
  An assumption of the investigation
- D.
  
  A research statistic
- E.
  
  A hypothesis
2.

The diagram below shows an example of interdependence among living organisms. During the day the organisms either use up or give off (A) or (B) as shown by the arrows.
- A.
  
  (a) is oxygen and (b) is carbon dioxide.
- B.
  
  (a) nitrogen and (b) is carbon dioxide.
- C.
  
  (a) is carbon dioxide and (b) is oxygen.
- D.
  
  (a) is carbon dioxide and (b) is carbohydrate.
3.

In bell pepper plants, the gene for long stems (L) is dominant over the gene for short stems (l). If a pure long-stemmed plant (LL) is crossed with a pure short-stemmed plant (ll), which statement describes the offspring plants that will result from this cross? (Draw a Punnet square to help you figure it out.)
- A.
  
  Half of the plants will have short stems and half will have long stems.
- B.
  
  All of the plants will have short stems.
- C.
  
  All of the plants will have stems of medium length.
- D.
  
  All of the plants will have long stems.
4.

There are three subatomic particles that form atoms. Name the particle which has a negative charge.
5.

Which BEST describes our planet?
- A.
  
  A liquid core surrounded by many layers of solid rock and metal
- B.
  
  A solid core surrounded by liquid and semi-solid layers on top of which “float” relatively thin plates of solid rock and earth which are constantly moving.
- C.
  
  A solid mantle which is sandwiched between liquid inner and outer layers.
- D.
  
  A liquid core encased in a solid crust through which magma sometimes erupts.
6.

The trachea, lungs, bronchial tubes and diaphragm comprise the system.
7.

Which is the primary means by which oxygen travels throughout a mammal's body to reach all tissues?
- A.
  
  Neural pathways
- B.
  
  Arteries
- C.
  
  Veins
- D.
  
  Bronchial tubes
- E.
  
  Muscles
8.

Muscle cells use large amounts of energy. Which organelles would be more abundant in an animal’s muscle tissue than in its other cells?
- A.
  
  Chromosomes
- B.
  
  Golgi bodies
- C.
  
  Lysosomes
- D.
  
  Mitochondria
- E.
  
  Vacuoles
9.

Which of the following affects does smoking cigarettes have?
- A.
  
  Causes wrinkles and yellow teeth
- B.
  
  Paralyzes cilia that help remove toxins in the respiratory tract
- C.
  
  Causes lung and/or mouth cancer
- D.
  
  Increases heart rate and blood pressure
- E.
  
  All of the above
10.

If a neutral atom loses an electron, what is formed?
- A.
  
  A gas
- B.
  
  An ion
- C.
  
  An acid
- D.
  
  A molecule
- E.
  
  All of the above
11.

What is the best reason for including fruits and leafy vegetables in a healthy diet?
- A.
  
  They are a good source of protein, which gives long-lasting energy.
- B.
  
  They are the best source of energy because they have lots of calories.
- C.
  
  They are rich in minerals and vitamins and have lots of fiber to make you feel full.
- D.
  
  They are high in fat which is the quickest form of energy for the body.
- E.
  
  All of the above
12.

Which human body system controls production of the hormones that regulate body functions?
- A.
  
  The respiratory system
- B.
  
  The skeletal system
- C.
  
  The circulatory system
- D.
  
  The digestive system
- E.
  
  The endocrine system
13.

Blake and Grant want to know why they see bumblebees in the summer but not in the winter. To solve the problem, which step of the scientific method should they do first?
- A.
  
  Write up a set of procedures
- B.
  
  Form a hypothesis
- C.
  
  Draw a conclusion
- D.
  
  Perform an experiment
- E.
  
  State the problem
14.

Based on its features and organelles, the cell in the diagram belongs to which kingdom of living organisms?
- A.
  
  Protists
- B.
  
  Bacteria
- C.
  
  Plants
- D.
  
  Animals
- E.
  
  Fungi
15.

If Mitchell, when he is 72 years old, has a stroke in the left frontal lobe of his cerebrum, what type of damage to his body will he most likely suffer?
- A.
  
  His heart will stop beating and he will die within a few minutes
- B.
  
  He will no longer be able to absorb nutrients from his food
- C.
  
  The right side of his body will be paralyzed
- D.
  
  He will have no feeling in his arms or legs
- E.
  
  His kidneys will shut and down and will require dialysis
16.

When messenger RNA leaves the nucleus and hooks up with a ribosome, what is made from the amino acids that are linked together during the translation process?
- A.
  
  A new DNA strand
- B.
  
  A protein
- C.
  
  A carbohydrate molecule
- D.
  
  A lipid
- E.
  
  ATP
17.

Cells spend most of their lives in which phase of the cell cycle?
- A.
  
  Prophase
- B.
  
  Interphase
- C.
  
  Cytokinesis
- D.
  
  Metaphase
- E.
  
  Anaphase
18.

The image below illustrates what phase of mitosis?
- A.
  
  Prophase
- B.
  
  Metaphase
- C.
  
  Anaphase
- D.
  
  Telophase
19.

While digging, a person found that most of the rocks were igneous rock. What can be concluded?
- A.
  
  The rocks were probably carried there by ancient people.
- B.
  
  The area was once covered by an ocean.
- C.
  
  A glacier passed through at one time.
- D.
  
  A volcano was nearby at one time.
- E.
  
  All of the above
20.

Sexual reproduction requires two different sets of chromosomes coming together to form a new, unique organism. Asexual reproduction involves only one set of genes in which offspring are identical to the parent (because they have the exact same genetic information). Is binary fission (which bacteria use to replicate) an example of sexual or asexual reproduction?
- A.
  
  Sexual
- B.
  
  Asexual
21.

On your trip to the Petrified Forest National Park, you got to dig for fossils. You mapped out where you found them, described their size and shape, and put all the clues together to make some guesses about the climate and animals whose preserved remains you found. If you did this for a living, what would your job title be?
- A.
  
  Geologist
- B.
  
  Paleontologist
- C.
  
  Endocrinologist
- D.
  
  Archeologist
- E.
  
  Embryologist
22.

El Cajon Pass in California is becoming higher than the land around it at a rate of nearly one centimeter each year. Which statement is true about the area?
- A.
  
  Erosion is slower than uplift at El Cajon Pass.
- B.
  
  Plates are separating at El Cajon Pass.
- C.
  
  Mountain building is slower than erosion at El Cajon Pass.
- D.
  
  Erosion and uplift are balanced at El Cajon Pass.
23.

A rock that contains fossil seashells was most likely formed as a result of:
- A.
  
  Volcanic activity
- B.
  
  Sedimentation
- C.
  
  Heat and pressure
- D.
  
  Magma cooling
24.

Where is hereditary (genetic, inherited) information found in a cell?
- A.
  
  Cytoplasm
- B.
  
  Chromosomes
- C.
  
  Chloroplasts
- D.
  
  Cell membrane
- E.
  
  All of the above
25.

The modern theory of evolution is centered on the role of natural selection in adaptation. Which of the following is an example of natural selection?
- A.
  
  A drought in southern California causes stress in a certain species of sparrows, killing nearly one third of the population.
- B.
  
  Due to the genetic variety produced by sexual reproduction, a male hummingbird is born that is particularly attractive to females of its species. This bird has great success at mating and producing offspring, thereby passing on his genetic good looks and producing many more of its kind.
- C.
  
  An unusually warm and rainy spring in northern Sudan results in a sudden migration of chimpanzees as they seek food and shelter.
- D.
  
  A certain gray wolf population in Northern Canada learns how to hunt together as a pack by surrounding and confusing their prey.