Science Flashcards
7 cards from real FTCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Science flashcards as text
Which best explains why water molecules are attracted to each other?
Answer: Hydrogen bonding due to polar O-H bonds
Water molecules form hydrogen bonds because oxygen is highly electronegative, creating partial charges that attract neighboring water molecules.
A student notices that the Moon appears to change shape over a month. What actually causes the Moon's phases?
Answer: Different portions of the Moon's sunlit half visible from Earth
Moon phases result from the changing angle between the Sun, Moon, and Earth, which determines how much of the Moon's illuminated side we see.
In a food web, which organism occupies the role of a primary producer?
Answer: Grass
Primary producers like grass convert solar energy into chemical energy through photosynthesis, forming the base of the food web.
A teacher asks students to identify a controlled variable in an experiment testing how light intensity affects plant growth. Which would be a controlled variable?
Answer: The amount of water given to each plant
Controlled variables are factors kept constant so they don't affect the results; water amount must be equal for all plants in this experiment.
Which process moves water from soil into plant roots against a concentration gradient?
Answer: Osmosis
Osmosis moves water from an area of high water concentration (wet soil) into root cells with lower water concentration through a semi-permeable membrane.
Which best describes the role of decomposers in an ecosystem?
Answer: They break down dead organic matter and return nutrients to the soil
Decomposers like bacteria and fungi break down dead organisms, recycling essential nutrients back into the soil for use by producers.
A student measures the wavelength and frequency of two sound waves. Wave A has a higher frequency than Wave B. What can be concluded about their wavelengths?
Answer: Wave A has a shorter wavelength
Since wave speed is constant in a given medium, frequency and wavelength are inversely related; higher frequency means shorter wavelength.