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Questions and Answers
Which of the following scenarios exemplifies a chemical change, resulting in the formation of new substances with altered properties?
Which of the following scenarios exemplifies a chemical change, resulting in the formation of new substances with altered properties?
- The combustion of methane gas, producing carbon dioxide and water. (correct)
- The dissolution of sugar in water, creating a homogeneous mixture.
- The fracturing of a rock into smaller pieces through physical force.
- The reversible phase transition of water from solid to liquid.
In the human respiratory system, where does the primary exchange of oxygen and carbon dioxide occur, facilitating the critical process of gas diffusion between air and blood?
In the human respiratory system, where does the primary exchange of oxygen and carbon dioxide occur, facilitating the critical process of gas diffusion between air and blood?
- The bifurcating bronchi, channeling air into the lungs.
- The cartilaginous rings of the trachea, maintaining airway patency.
- The vocal cords within the larynx, enabling phonation.
- The microscopic alveoli, with their extensive surface area and thin walls. (correct)
Which vascular tissue in plants is primarily responsible for the unidirectional transport of water and dissolved minerals from the roots to the aerial parts, driven by transpiration pull and root pressure?
Which vascular tissue in plants is primarily responsible for the unidirectional transport of water and dissolved minerals from the roots to the aerial parts, driven by transpiration pull and root pressure?
- Phloem
- Xylem (correct)
- Stomata
- Root hairs
Which method of asexual propagation exploits the totipotency of plant cells, enabling the development of a complete, genetically identical plant from a fragment of the parent organism?
Which method of asexual propagation exploits the totipotency of plant cells, enabling the development of a complete, genetically identical plant from a fragment of the parent organism?
Which optical phenomenon describes the wavelength-dependent separation of incident white light into its constituent colors, resulting in a visible spectrum?
Which optical phenomenon describes the wavelength-dependent separation of incident white light into its constituent colors, resulting in a visible spectrum?
Due to the limitations of the enzymes involved, photosynthesis in most terrestrial plants is exclusively confined to the daylight hours, ceasing entirely during the night.
Due to the limitations of the enzymes involved, photosynthesis in most terrestrial plants is exclusively confined to the daylight hours, ceasing entirely during the night.
During intense physical activity, anaerobic respiration in muscle tissues generates lactic acid as a byproduct, leading to immediate and permanent muscle fatigue.
During intense physical activity, anaerobic respiration in muscle tissues generates lactic acid as a byproduct, leading to immediate and permanent muscle fatigue.
Phloem tissue, comprised of sieve tubes and companion cells, is solely responsible for the unidirectional transport of water and dissolved nutrients from the roots to the leaves in vascular plants.
Phloem tissue, comprised of sieve tubes and companion cells, is solely responsible for the unidirectional transport of water and dissolved nutrients from the roots to the leaves in vascular plants.
Binary fission, a form of asexual reproduction observed in prokaryotes and some single-celled eukaryotes, involves the symmetrical division of a parent cell into two daughter cells with identical genetic material.
Binary fission, a form of asexual reproduction observed in prokaryotes and some single-celled eukaryotes, involves the symmetrical division of a parent cell into two daughter cells with identical genetic material.
A biconcave lens, characterized by its diverging properties, is capable of converging parallel light rays to a real focal point located on the opposite side of the lens.
A biconcave lens, characterized by its diverging properties, is capable of converging parallel light rays to a real focal point located on the opposite side of the lens.
During forceful exhalation, such as when coughing, what is the most accurate description of the diaphragm's action?
During forceful exhalation, such as when coughing, what is the most accurate description of the diaphragm's action?
Transpiration is solely driven by the plant's internal metabolic activities, independent of external environmental factors.
Transpiration is solely driven by the plant's internal metabolic activities, independent of external environmental factors.
Explain the evolutionary advantage of cross-pollination over self-pollination for plant species.
Explain the evolutionary advantage of cross-pollination over self-pollination for plant species.
The formation of a rainbow is primarily due to the ______ and dispersion of light as it passes through water droplets.
The formation of a rainbow is primarily due to the ______ and dispersion of light as it passes through water droplets.
Under which conditions would anaerobic respiration be favored over aerobic respiration in muscle cells?
Under which conditions would anaerobic respiration be favored over aerobic respiration in muscle cells?
Match the following methods of asexual reproduction in plants with their descriptions:
Match the following methods of asexual reproduction in plants with their descriptions:
What specific mechanism allows the human eye to perceive a wide range of colors, and how does it translate light wavelengths into color perception?
What specific mechanism allows the human eye to perceive a wide range of colors, and how does it translate light wavelengths into color perception?
Which statement best describes the role and interaction of chlorophyll and sunlight in the process of photosynthesis?
Which statement best describes the role and interaction of chlorophyll and sunlight in the process of photosynthesis?
Flashcards
Chemical Change
Chemical Change
A change that alters the chemical composition of a substance, creating a new substance.
Alveoli
Alveoli
Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.
Xylem
Xylem
Plant tissue that transports water and minerals upwards from the roots.
Vegetative Propagation
Vegetative Propagation
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Dispersion
Dispersion
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Boiling Point
Boiling Point
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Stomata
Stomata
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Photosynthesis
Photosynthesis
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Chlorophyll
Chlorophyll
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Refraction
Refraction
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Diaphragm's Role
Diaphragm's Role
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Transpiration
Transpiration
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Pollination Types
Pollination Types
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Rainbow Formation
Rainbow Formation
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Respiration Types
Respiration Types
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Water Transport in Trees
Water Transport in Trees
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Asexual Reproduction
Asexual Reproduction
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Photosynthesis Rate Factors
Photosynthesis Rate Factors
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Photosynthesis Process
Photosynthesis Process
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Circulatory System
Circulatory System
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Study Notes
- This is a comprehensive 80-mark science test for Class 7, covering "How Things Change," "Respiration: The Breath of Life," "Movement of Substances," "Multiplication in Plants," and "Light."
Chemical vs. Physical Changes
- Rusting of iron exemplifies a chemical change.
- Melting ice, breaking glass, and boiling water are physical changes.
- Physical changes involve alterations in form or appearance, whereas chemical changes involve the formation of new substances.
Respiration
- Gas exchange primarily occurs in the alveoli of the human respiratory system.
- The diaphragm aids in respiration.
- Anaerobic respiration in muscles produces lactic acid.
- Photosynthesis occurs in the daytime.
Movement of Substances
- Xylem is mainly responsible for the upward movement of water and minerals in plants.
- Phloem transports food, not water, in plants.
- Transpiration is the process where water evaporates from plant leaves, crucial for water movement and cooling.
- Water moves from roots to leaves through xylem tissue.
Reproduction in Plants
- Vegetative propagation involves developing a new plant from a part of the parent plant, which is a form of asexual reproduction.
- Binary fission is a common reproduction method in amoebae.
- The fusion of male and female gametes forms a zygote.
- Self-pollination involves pollen from the same plant, while cross-pollination involves pollen from a different plant.
Light
- Dispersion explains the splitting of white light into its constituent colors.
- A concave lens diverges light rays, not converges.
- Refraction is the bending of light as it passes from one medium to another.
Processes
- Evaporation is the process of a liquid changing into a gas below its boiling point.
- Stomata are tiny openings on leaves that facilitate gas exchange.
- Photosynthesis is how green plants make their own food.
- Oxygen is a byproduct of photosynthesis.
Plant Biology
- Chlorophyll is the pigment responsible for absorbing light energy in plants.
- Cells are the basic unit of life.
Human Biology
- The iris controls the amount of light entering the eye.
- The human eye perceives color through specialized cells in the retina.
Aerobic vs. Anaerobic Respiration
- Aerobic respiration requires oxygen, produces more energy, and yields carbon dioxide and water.
- Anaerobic respiration doesn't require oxygen, produces less energy, and can yield lactic acid or ethanol.
Water Transport in Tall Trees
- Water is transported via xylem, aided by transpiration pull and cohesion of water molecules.
Asexual Reproduction in Plants
- Budding (e.g., yeast), fragmentation (e.g., algae), and spore formation (e.g., fungi) are methods.
Photosynthesis
- Chlorophyll absorbs sunlight, carbon dioxide is taken in, and glucose is produced.
Human Circulatory System
- The circulatory system transports oxygen and nutrients.
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Description
Comprehensive science test for Class 7, focusing on physical vs chemical changes, respiration in humans and plants, and the movement of substances in plants. Covers key concepts like rusting, gas exchange in alveoli, xylem, and transpiration.
