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Ninth Grade (Grade 9) Science Questions

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Grade 9 Biochemical Pathways
Which statement describes cellular respiration?
  1. The process of breaking down chemical energy stored in bonds into energy that can be used by the cell
  2. The process of creating food for the cell
  3. The process of combining oxygen and water to produce another substance to be transported
  4. The process of making proteins
Grade 9 Macromolecules
Enzymes are critical for biological reactions to occur in an organism. How do enzymes help chemical reactions to take place?
  1. They speed up reactions by adding more substrates
  2. They slow reactions down by increasing the activation energy
  3. They speed up reactions by lowering the activation energy
  4. They slow down reactions by changing the overall temperature
Grade 9 Biochemical Pathways
Grade 9 Human Reproduction
When does conception or fertilization occur?
  1. a dominant gene overrides a recessive gene.
  2. sperm from a male unites with an egg from a female.
  3. an egg matures in a female's ovary.
  4. all 23 pairs of chromosomes are present.
Grade 9 Food Chains and Webs
Grade 9 Conservation and Biodiversity
If fish are caught faster than they can breed, what will happen to the population?
  1. decrease
  2. move to other waters
  3. remain the same
  4. increase
Grade 9 Biochemical Pathways
Grade 9 Communities, Populations, and Ecosystems
Grade 9 Environmental Science
Which of the following is not a greenhouse gas?
  1. water vapor
  2. carbon dioxide
  3. oxygen
Grade 9 Cell Structure and Function
Which of these processes used the cell's energy?
  1. passive transport
  2. active transport
  3. diffusion
  4. osmosis
Grade 9 Earth's Layers
What is one reason that the Earth's core is so hot?
  1. Coal and oil burn in the core.
  2. As heavy elements in the core decay, they produce radioactive heat.
  3. The Sun heats up the Earth and causes the inside to melt.
Grade 9 Botany
In the nitrogen cycle, how is nitrogen is fixed?
  1. nitrogen-fixing bacteria
  2. lightning
  3. a only
  4. a and b
  5. none of the above
Grade 9 Conservation and Biodiversity
Grade 9 Human Reproduction
How are blood and nutrients carried from the mother to the developing fetus?
  1. placenta
  2. fallopian tubes
  3. endometrium
  4. umbilical cord
Grade 9 Environmental Science
Nitrogen is not a greenhouse gas. This is because nitrogen
  1. absorbs UV radiation
  2. breaks down UV radiation
  3. scatters UV radiation
Grade 9 Biotic and Abiotic
Which is a biotic factor operating within an ecosystem?
  1. the type of climate in a given region
  2. the carnivores that consume other animals
  3. the amount of helium gas in the air
  4. the rate of flow of water in a river
Grade 9 Human Reproduction
What are the overall physical changes that occur in male and female bodies during puberty called?
  1. premenstrual symdrome.
  2. estrogen
  3. secondary sex characteristics
  4. testosterone
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