C371 Concepts in Science

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Free C371 Concepts in Science Questions

1.

During an experiment, students design a series of miniature landscapes using various materials such as clay, gravel, and vegetation. They then simulate rainfall by pouring water over these landscapes and measure the amount of material that washes away. Which scientific question can the students explore based on their experiment?

  • How does vegetation influence soil composition?

  • What role does slope angle play in sediment transport?

  • How do different types of rocks affect plant growth?

  • What are the effects of temperature on soil moisture?

Explanation

Explanation

By simulating rainfall over miniature landscapes and measuring the material that washes away, students can investigate how slope angle affects the movement of sediment. The steeper the slope, the more gravitational force acts on the particles, increasing sediment transport. This experiment focuses on erosion and sediment movement rather than soil composition, rock types, or temperature effects.

Correct Answer

What role does slope angle play in sediment transport?


2.

What is an example of a biotic interaction?

  • Competition between two plant species for sunlight

  • Rock formations

  • Atmospheric pressure

  • Rainfall

Explanation

Explanation

Biotic interactions occur between living organisms in an ecosystem. Competition between two plant species for sunlight is a clear example, as both species rely on the same resource to survive and grow. Rock formations, atmospheric pressure, and rainfall are abiotic factors, meaning they are non-living components of the environment and do not constitute biotic interactions.

Correct Answer

Competition between two plant species for sunlight


3.

What explains why lithium and sodium have similar chemical properties?

  • Both are positively charged

  • Both are in the same group on the periodic table

  • Both are in the same period on the periodic table

  • Both have low atomic weights

Explanation

Explanation

Elements in the same group (vertical column) of the periodic table have the same number of valence electrons, which determines their chemical reactivity and properties. Lithium and sodium are both in Group 1 (alkali metals), so they have similar chemical behaviors, such as reacting vigorously with water to form hydroxides. Being in the same period or having low atomic weight does not directly determine chemical similarity.

Correct Answer

Both are in the same group on the periodic table


4.

The energy-transfer molecule formed in cell respiration is:

  • DNA

  • Protein

  • Glucose

  • ATP

Explanation

Explanation

Cellular respiration is the process by which cells convert nutrients, primarily glucose, into usable energy. This energy is stored in the form of adenosine triphosphate (ATP), which cells use to power various biological functions. While DNA carries genetic information and proteins perform structural and enzymatic roles, and glucose serves as the fuel, ATP is the direct energy-transfer molecule produced during respiration, making it essential for cellular activities.

Correct Answer

ATP


5.

The two factors that contribute most directly to seasonality are...?

  • Tilt of the Earth's axis; The Earth's daily rotation

  • Tilt of the Earth's axis; Air Channels

  • The Earth's daily rotation; The Earth's orbital path

  • Tilt of the Earth's axis; The Earth's orbital path

Explanation

Explanation

Seasonal changes on Earth are primarily caused by the tilt of the Earth’s axis (approximately 23.5 degrees) relative to its orbital plane and the Earth’s revolution around the Sun. The axial tilt determines the intensity and distribution of sunlight on different regions, while the orbit around the Sun changes the position of the Earth relative to the Sun throughout the year. Daily rotation affects day and night but not seasons, and air channels do not directly create seasons.

Correct Answer

Tilt of the Earth's axis; The Earth's orbital path


6.

Which of the following best describes mass in a scientific context?

  • A measure of the gravitational force acting on an object

  • A measurement of the amount of matter in an object

  • A measure of the volume an object occupies

  • A measurement of the temperature of an object

Explanation

Explanation

In science, mass is the measure of the amount of matter contained in an object. It is independent of gravity and does not change based on location. Weight, in contrast, measures the gravitational force on an object. Volume refers to the space an object occupies, and temperature measures thermal energy, making mass specifically the amount of matter.

Correct Answer

A measurement of the amount of matter in an object


7.

The group of fungi that includes the molds that often grow on bread is ______

  • Ascomycota

  • Basidiomycota

  • Zygomycota

  • None of the above

Explanation

Explanation

The molds that commonly grow on bread, such as Rhizopus stolonifer, belong to the group Zygomycota. These fungi reproduce both sexually and asexually and are known for rapidly colonizing decaying organic matter. Ascomycota and Basidiomycota include other types of fungi, such as yeasts, morels, and mushrooms, but bread molds are specifically part of the Zygomycota group.

Correct Answer

Zygomycota


8.

What occurs when a neutral atom gains one or more electrons?

  • It becomes a positive ion

  • It remains neutral

  • It becomes a negative ion

  • It loses protons

Explanation

Explanation

When a neutral atom gains one or more electrons, it acquires extra negative charges, resulting in a negatively charged ion called an anion. The number of protons in the nucleus remains unchanged, so the overall charge becomes negative. Gaining electrons does not make the atom positive or neutral, and the protons are not lost in this process.

Correct Answer

It becomes a negative ion


9.

In cellular respiration, stored chemical energy in...

  • Organic molecules is converted to ATP molecules

  • ATP molecules is used to build NADH molecule

  • ATP is used to make organic molecules like glucose

  • ATP and NADH is converted to carbohydrate molecules

Explanation

Explanation

Cellular respiration is the process by which cells extract energy from organic molecules, such as glucose, and convert it into ATP, the energy currency of the cell. ATP stores and provides energy for cellular activities. NADH is an electron carrier produced during the process, but the primary conversion is from chemical energy in organic molecules to ATP. The other options describe processes that do not reflect the main energy transfer in cellular respiration.

Correct Answer

Organic molecules is converted to ATP molecules


10.

Kinetic energy is defined as energy due to

  • Position

  • Calories

  • Gravity

  • Motion

Explanation

Explanation

Kinetic energy is the energy that an object possesses because of its motion. The faster an object moves, the greater its kinetic energy. It differs from potential energy, which is related to an object’s position or configuration. Calories measure energy intake in food, and gravity can influence potential energy, but motion specifically defines kinetic energy.

Correct Answer

Motion


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