CSU Natural Sciences 1 — Questions and Answers
Question 1: What process do plants use to convert sunlight into chemical energy?
- Cellular respiration
- Photosynthesis (Correct answer)
- Fermentation
- Osmosis
Correct answer: Photosynthesis
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.
Question 2: Which of Newton's Laws of Motion states that for every action there is an equal and opposite reaction?
- First Law
- Second Law
- Third Law (Correct answer)
- Law of Universal Gravitation
Correct answer: Third Law
Newton's Third Law states that whenever one object exerts a force on a second object, the second exerts an equal and opposite force back.
Question 3: What is the atomic number of carbon?
- 4
- 6 (Correct answer)
- 8
- 12
Correct answer: 6
Carbon has an atomic number of 6, meaning it has 6 protons in its nucleus.
Question 4: DNA is composed of repeating units called what?
- Amino acids
- Fatty acids
- Nucleotides (Correct answer)
- Monosaccharides
Correct answer: Nucleotides
DNA is a polymer made up of nucleotide monomers, each consisting of a phosphate group, a sugar, and a nitrogenous base.
Question 5: What is the SI unit of electric current?
- Volt
- Watt
- Ohm
- Ampere (Correct answer)
Correct answer: Ampere
The ampere (A) is the SI base unit of electric current, measuring the rate of flow of electric charge.
Question 6: Which gas makes up the largest percentage of Earth's atmosphere?
- Oxygen
- Carbon dioxide
- Nitrogen (Correct answer)
- Argon
Correct answer: Nitrogen
Nitrogen makes up approximately 78% of Earth's atmosphere, making it the most abundant gas.
Question 7: What type of chemical bond involves the sharing of electrons between atoms?
- Ionic bond
- Covalent bond (Correct answer)
- Hydrogen bond
- Metallic bond
Correct answer: Covalent bond
A covalent bond forms when two atoms share one or more pairs of electrons to achieve stable electron configurations.
CSU Natural Sciences 1
What process do plants use to convert sunlight into chemical energy?