C371 Concepts in Science
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Free C371 Concepts in Science Questions
Which of the following processes describes the movement of water vapor from the surface of plants into the atmosphere?
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Evaporation
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Condensation
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Transpiration
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Infiltration
Explanation
Explanation
Transpiration is the process by which water vapor is released from the surfaces of plant leaves into the atmosphere. Water is absorbed by plant roots, transported through the plant, and evaporates from small openings called stomata. Evaporation occurs from soil or water surfaces, condensation is the change of vapor into liquid, and infiltration is the movement of water into the soil.
Correct Answer
Transpiration
Which of the following describes a key role of plant roots in relation to water and nutrients?
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Facilitating gas exchange with the atmosphere
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Storing energy in the form of starch
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Absorbing water and essential minerals from the soil
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Producing flowers and seeds for reproduction
Explanation
Explanation
Plant roots serve as the primary organs for absorbing water and essential minerals from the soil, which are vital for growth, photosynthesis, and other physiological processes. While roots can also store some energy in the form of starch, their central role is nutrient and water uptake. Gas exchange primarily occurs in leaves, and the production of flowers and seeds is a function of reproductive structures, not roots.
Correct Answer
Absorbing water and essential minerals from the soil
The energy-transfer molecule formed in cell respiration is:
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DNA
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Protein
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Glucose
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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
Which of the following factors most significantly influences the recharge rate of an aquifer?
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High vegetation cover
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Impermeable rock layers
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Permeable soil
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Frequent drought conditions
Explanation
Explanation
The recharge rate of an aquifer depends on how easily water can infiltrate the ground and reach the underground water storage. Permeable soil allows water to pass through and percolate down to the aquifer efficiently. In contrast, impermeable rock layers block water movement, high vegetation can slow infiltration, and drought reduces water availability. Therefore, the permeability of the soil is the key factor affecting how quickly an aquifer is replenished.
Correct Answer
Permeable soil
This body system is responsible for producing hormones.
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Integumentary
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Skeletal
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Respiratory
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Endocrine
Explanation
Explanation
The endocrine system is responsible for producing and releasing hormones into the bloodstream. These chemical messengers regulate a variety of body functions, including growth, metabolism, reproduction, and homeostasis. While the integumentary system protects the body, the skeletal system provides structure, and the respiratory system facilitates gas exchange, hormone production is specifically the role of the endocrine system.
Correct Answer
Endocrine
What causes an object to appear larger and closer than it actually is when viewed underwater?
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Refraction of light
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Absorption of colors
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Diffusion of light
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Reflection of light
Explanation
Explanation
When light passes from one medium to another, such as from water to air, it bends due to a change in speed; this phenomenon is called refraction. Underwater, refraction makes objects appear magnified and closer than they really are because the light rays bend as they exit the water and enter the observer’s eyes. This optical effect is responsible for the distorted perception of size and distance underwater.
Correct Answer
Refraction of light
The Sun is composed of
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Mostly Hydrogen and Helium
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Mostly Silicon, the most common element on Earth
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Almost all Hydrogen
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Mostly Nitrogen and Oxygen
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Mostly Hydrogen and Oxygen
Explanation
Explanation
The Sun is primarily composed of hydrogen (about 70% by mass) and helium (about 28% by mass), with the remaining 2% consisting of heavier elements. Hydrogen serves as the fuel for nuclear fusion in the Sun’s core, producing energy that powers the Sun and supports life on Earth. Elements like silicon, nitrogen, and oxygen are present in trace amounts but do not dominate the Sun’s composition.
Correct Answer
Mostly Hydrogen and Helium
In a classroom experiment on tectonic plate movement, students are tasked with selecting a material to simulate the lithosphere, which is the rigid outer layer of Earth. Which of the following materials would be the most appropriate choice to represent the lithosphere?
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A flexible rubber sheet that can easily bend
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A thick piece of cardboard that holds its shape
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A container filled with water that can flow freely
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A sponge that compresses under pressure
Explanation
Explanation
The lithosphere is the rigid, outermost layer of Earth that includes the crust and the uppermost mantle. To simulate its properties in an experiment, a material that is stiff and maintains its shape is ideal. A thick piece of cardboard is rigid and does not easily bend or flow, making it a good analog. Flexible, flowing, or compressible materials do not accurately represent the mechanical properties of the lithosphere.
Correct Answer
A thick piece of cardboard that holds its shape
In cellular respiration, which of the following molecules are used to transfer energy to the electron transport chain?
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NADH and FADH2
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ATP
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NAD+
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FADH2
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Coenzyme A
Explanation
Explanation
During cellular respiration, high-energy electrons are carried to the electron transport chain to produce ATP. NADH and FADH2 act as electron carriers, transporting these electrons from glycolysis and the Krebs cycle to the chain. This transfer of electrons drives the creation of a proton gradient across the mitochondrial membrane, which ultimately powers ATP synthesis. ATP itself is the energy product, not the carrier, while NAD+, FADH2 (alone), and Coenzyme A do not directly transfer electrons to the chain.
Correct Answer
NADH and FADH2
Which two processes return water from Earth’s surface to the atmosphere?
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Evaporation and transpiration
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Condensation and transpiration
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Evaporation and precipitation
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Condensation and precipitation
Explanation
Explanation
The water cycle describes the continuous movement of water between Earth’s surface and the atmosphere. Evaporation occurs when water from oceans, rivers, and lakes turns into water vapor, while transpiration involves water being released from plants into the air. Together, these two processes transfer water from the surface into the atmosphere, making them the primary mechanisms for returning water to the air.
Correct Answer
Evaporation and transpiration
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