Science Virtual Quiz Bee (Average Round)

1. Maria uses a compound microscope to observe a sample of an onion cell. She notices that the image is blurry even after adjusting the coarse focus knob. What should she do next to improve the clarity of the image?

• A) Increase the magnification

  
  

• B) Turn on the light source

• C) Adjust the fine focus knob

• D) Switch to a lower objective lens

2. John is comparing plant and animal cells under the microscope. He observes a large, central structure filled with fluid in the plant cell. What is this structure, and what is its main function?

• A) Nucleus; controls cell activities

  
  

• B) Chloroplast; photosynthesis

• C) Vacuole; stores nutrients and waste products

• D) Cell membrane; controls what enters and leaves the cell

3. Lisa is observing an animal cell under a microscope. She identifies several small, round structures within the cell that are responsible for producing energy. What are these structures called?

• A) Ribosomes

  
  

• B) Mitochondria

• C) Golgi bodies

• D) Lysosomes

4. During a lab activity, Mark accidentally drops the glass slide while preparing a sample of cheek cells. The slide cracks, but the cover slip remains intact. What should he do to ensure safety and continue his observation?

• A) Use the cracked slide carefully to avoid further damage.

• B) Discard the cracked slide and prepare a new one.

• C) Remove the cover slip and place it on a new slide.

• D) Continue using the cracked slide but switch to a lower magnification.

5. Sarah is asked to identify whether a cell sample is from a plant or an animal. Under the microscope, she observes a rigid outer structure surrounding the cell membrane. What conclusion can she draw from this observation?

• A) The cell is an animal cell because of its rigid structure.

• B) The cell is a plant cell because of the presence of a cell wall.

• C) The cell is an animal cell because of the presence of a membrane.

• D) The cell is a plant cell because of its lack of a nucleus.

1. 6. The columns going down the table are called ___________. The elements in a column all have the same number of _______________.

• A.Periods, Electron Orbit

• B. Groups, Valence Electrons

• C. Groups, Electron Orbit

• D.Periods, Valence Electron

7. The ______________ are found in the first group of the periodic table. They have the reputation of being very _____________.

• A. Alkali Metals, Flammable

• B. Alkaline Earth Metals. Good Conductor

• C. Alkali Metals, Reactive

• D. Transition Metals, Reactive

8. Which of the following  is a covalent compound?

• A. Iron(III)chloride

• B. Potassium chlorate

• C. Carbon monoxide

• D. Strontium fluoride

9. Which of the following is the correct chemical formula of Ammonium sulfate?

• 1. A. (NH₃)SO₃

• B.  (NH₄)₂SO₄

• C. NH₃(SO₄)₂

• D (NH₄)₃SO₄

2. 10. Which of the following is the correct chemical name of NF₃?

• 1. Nitrogen trifluoride

  
  

• 1. Mononitrogen trifluoride

• 1. Nitrogen tetrafluoride

• 1. Nitrogen tetrafluoride