WI Forward Science 1 — Questions and Answers
Question 1: Which part of a plant is responsible for making food through photosynthesis?
- Roots
- Stem
- Leaves (Correct answer)
- Flowers
Correct answer: Leaves
Leaves are the primary site for photosynthesis in most plants. They contain chlorophyll, a green pigment that captures sunlight energy. This energy is then used to convert carbon dioxide and water into glucose (food) and oxygen, a process essential for the plant's survival.
Question 2: What causes day and night on Earth?
- The Earth’s revolution around the Sun
- The Earth’s rotation on its axis (Correct answer)
- The tilt of the Earth’s axis
- The distance of the Earth from the Sun
Correct answer: The Earth’s rotation on its axis
Day and night are caused by the Earth's continuous spinning motion on its axis, a process known as rotation. As the Earth rotates, different parts of its surface are alternately exposed to the sun's light, creating daytime, or face away from the sun, resulting in nighttime. One complete rotation takes approximately 24 hours.
Question 3: Which state of matter has a definite shape and volume?
- Solid (Correct answer)
- Liquid
- Gas
- Plasma
Correct answer: Solid
A solid is a state of matter characterized by particles that are tightly packed together and vibrate in fixed positions. This arrangement gives solids a definite and unchanging shape, as well as a definite volume. Unlike liquids or gases, solids do not conform to the shape of their container.
Question 4: A student notices that plants grow faster in sunlight than in the shade. What is the best question for a scientific investigation?
- Why are plants green?
- How does sunlight affect plant growth? (Correct answer)
- What do plants need to survive?
- How tall can plants grow?
Correct answer: How does sunlight affect plant growth?
A good scientific question is specific, testable, and focuses on the relationship between variables observed. The student's observation directly links sunlight to plant growth. Therefore, asking 'How does sunlight affect plant growth?' directly addresses this relationship and sets up a clear, measurable investigation.
Question 5: What is a renewable resource?
- Coal
- Natural gas
- Sunlight (Correct answer)
- Oil
Correct answer: Sunlight
A renewable resource is a natural resource that can be replenished naturally over a relatively short period of time, or is practically inexhaustible. Sunlight fits this definition perfectly, as it is a continuous and abundant source of energy that is not depleted by human use. In contrast, coal, natural gas, and oil are finite, non-renewable fossil fuels.
WI Forward Science 1
Which part of a plant is responsible for making food through photosynthesis?