C371 Concepts in Science
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Free C371 Concepts in Science Questions
Forest gaps play an important role in maintaining a high diversity of understory herbs and shrubs in climax forest communities. What is the primary mechanism by which forest gaps perform this function?
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They cause a rapid spike in soil nutrients as trees decompose
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They provide a refuge for early seral stage species from herbivory.
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They provide a physical barrier to climax species dispersal.
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They allow more light to reach the forest floor.
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They allow more moisture to reach the forest floor
Explanation
Explanation
Forest gaps, created by fallen trees or other disturbances, increase light availability on the forest floor. This enhanced light environment allows shade-intolerant, early successional species to establish and grow, promoting biodiversity in the understory. While soil nutrients and moisture may be affected, the primary mechanism driving increased diversity is the greater access to sunlight for these plants.
Correct Answer
They allow more light to reach the forest floor
What is an example of a biotic interaction?
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Competition between two plant species for sunlight
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Rock formations
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Atmospheric pressure
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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
A researcher performs a cross between 2 mice, both having black fur. Black fur is dominant over white fur. 75% of the offspring have black coats and 25% have white coats. The researcher can assume that the parent's genotypes were most likely:
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BB x BB
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BB x Bb
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BB x bb
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Bb x Bb
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bb x bb
Explanation
Explanation
The offspring ratio of 3:1 (75% black, 25% white) is typical of a cross between two heterozygous parents (Bb x Bb) for a single trait with complete dominance. Black fur (B) is dominant over white fur (b). Crosses involving homozygous dominant (BB) or homozygous recessive (bb) parents would produce different ratios of black and white offspring, making Bb x Bb the most likely parental genotype.
Correct Answer
Bb x Bb
Methane, CH4, has a shape similar to
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Water
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Carbon tetrachloride
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Carbon dioxide
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Carbon monoxide
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Hydrogen chloride
Explanation
Explanation
Methane (CH4) has a tetrahedral molecular geometry, where the central carbon atom is bonded to four hydrogen atoms at equal angles of approximately 109.5°. Carbon tetrachloride (CCl4) also has a tetrahedral shape with four chlorine atoms bonded to a central carbon, making its geometry similar to methane. Water, carbon dioxide, carbon monoxide, and hydrogen chloride have different molecular geometries, such as bent or linear structures.
Correct Answer
Carbon tetrachloride
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?
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How does vegetation influence soil composition?
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What role does slope angle play in sediment transport?
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How do different types of rocks affect plant growth?
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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?
Which of the following best describes mass in a scientific context?
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A measure of the gravitational force acting on an object
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A measurement of the amount of matter in an object
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A measure of the volume an object occupies
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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
According to Newton's first law, if an object is moving at a constant speed in a set direction, and there is no outside force acting on it
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It will continue to move at that speed and in that direction.
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It will slow down and eventually stop.
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It will continue to move at that speed, but will change direction.
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It will speed up, but keep moving in the same direction.
Explanation
Explanation
Newton's first law of motion, also known as the law of inertia, states that an object in motion will remain in motion at a constant velocity (constant speed and direction) unless acted upon by an external force. This means that if no outside forces such as friction or air resistance are present, the object will continue moving steadily in the same direction and speed indefinitely.
Correct Answer
It will continue to move at that speed and in that direction.
Which of the following is a method of heat transfer?
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Nuclear decay
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Insulation
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Transpiration
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Convection
Explanation
Explanation
Heat can be transferred through conduction, convection, and radiation. Convection is the transfer of heat through the movement of fluids (liquids or gases), such as warm air rising and cool air sinking. Nuclear decay produces energy at the atomic level but is not a heat transfer mechanism. Insulation prevents heat transfer, and transpiration is the process by which plants release water vapor, which can result in cooling but is not a direct heat transfer method.
Correct Answer
Convection
In cellular respiration, stored chemical energy in...
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Organic molecules is converted to ATP molecules
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ATP molecules is used to build NADH molecule
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ATP is used to make organic molecules like glucose
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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
Which of the following gases is primarily responsible for the process of nuclear fusion in the Sun's core?
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Hydrogen
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Oxygen
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Carbon dioxide
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Helium
Explanation
Explanation
Nuclear fusion in the Sun’s core primarily involves hydrogen nuclei (protons) fusing together to form helium. This fusion process releases a tremendous amount of energy in the form of light and heat. Oxygen and carbon dioxide are not involved in the Sun’s core fusion, and while helium is a product of fusion, it is not the starting material. Hydrogen is the fuel that powers the Sun’s energy production.
Correct Answer
Hydrogen
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