Science Flashcards

Which part of a plant is primarily responsible for photosynthesis?

Answer: Leaves

Leaves are the primary site for photosynthesis in most plants. They contain chlorophyll, a pigment that captures sunlight, and have specialized structures to absorb carbon dioxide and release oxygen, facilitating the conversion of light energy into chemical energy.

What is the primary function of the circulatory system in humans?

Answer: To transport oxygen, nutrients, and waste throughout the body

The circulatory system, comprising the heart, blood vessels, and blood, is essential for transporting vital substances throughout the body. It delivers oxygen and nutrients to cells and carries away waste products like carbon dioxide, ensuring proper bodily function.

Which of the following is a renewable resource?

Answer: Solar energy

A renewable resource is one that can be replenished naturally over a relatively short period of time. Solar energy is derived from the sun, an inexhaustible source, making it a prime example of a renewable resource, unlike fossil fuels such as coal, oil, and natural gas.

What happens to water when it changes from a liquid to a gas?

Answer: It evaporates.

When water changes from a liquid to a gas, it undergoes the process of evaporation. This occurs when water molecules gain enough energy to escape the liquid surface and become water vapor in the air.

Which of the following best describes gravity?

Answer: A force that pulls objects toward each other

Gravity is a fundamental force of nature that causes any two objects with mass to attract each other. The more massive an object, the stronger its gravitational pull, which is why Earth's gravity pulls objects towards its center.