TCAP Science Concepts 3 — Questions and Answers
Question 1: Which layer of Earth's atmosphere contains the ozone layer that protects life from harmful UV radiation?
- Troposphere
- Stratosphere (Correct answer)
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer is located in the stratosphere, approximately 15–35 km above Earth's surface.
Question 2: A circuit has a battery, a switch, and two light bulbs connected in series. If one bulb burns out, what happens to the other bulb?
- It burns brighter
- It also goes out because the circuit is broken (Correct answer)
- It stays on because circuits share electricity
- It dims slightly but stays on
Correct answer: It also goes out because the circuit is broken
In a series circuit, all components share a single path, so if one bulb fails, the circuit breaks and all components stop working.
Question 3: Which process do plants use to convert carbon dioxide and water into glucose using sunlight?
- Cellular respiration
- Fermentation
- Photosynthesis (Correct answer)
- Transpiration
Correct answer: Photosynthesis
Photosynthesis is the process by which plants use light energy to convert CO₂ and water into glucose and oxygen.
Question 4: A wave with a higher frequency will have which of the following compared to a wave with a lower frequency (at the same wave speed)?
- Longer wavelength
- Shorter wavelength (Correct answer)
- Greater amplitude
- Slower speed
Correct answer: Shorter wavelength
Since wave speed = frequency × wavelength, higher frequency means shorter wavelength when wave speed remains constant.
Question 5: Which type of eclipse occurs when the Moon passes between Earth and the Sun, casting a shadow on Earth?
- Lunar eclipse
- Solar eclipse (Correct answer)
- Penumbral eclipse
- Partial lunar eclipse
Correct answer: Solar eclipse
A solar eclipse occurs when the Moon blocks sunlight from reaching Earth, casting the Moon's shadow on Earth's surface.
Question 6: Which of the following is an example of a physical property of matter?
- Flammability
- Reactivity with acid
- Density (Correct answer)
- Ability to rust
Correct answer: Density
Density is a physical property because it can be measured without changing the chemical composition of the substance.
Question 7: What is the main role of decomposers in an ecosystem?
- Converting sunlight to food
- Breaking down dead organisms and returning nutrients to the soil (Correct answer)
- Consuming live plants for energy
- Producing oxygen through respiration
Correct answer: Breaking down dead organisms and returning nutrients to the soil
Decomposers like bacteria and fungi break down dead organic matter, releasing nutrients back into the soil for producers to use.
TCAP Science Concepts 3
Which layer of Earth's atmosphere contains the ozone layer that protects life from harmful UV radiation?