IGCSE Biology Questions And Answers
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What is the function of ribosomes in a cell?
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Energy production
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Protein synthesis
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DNA replication
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Waste removal
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Ready to test your understanding of biology? Our IGCSE Biology Questions and Answers Quiz is here to help you prepare for your exams with confidence. This quiz covers all the essential topics required for the IGCSE curriculum, from cell biology and genetics to human physiology and ecology.
Whether you're looking to ace your IGCSE Biology exam or just want See moreto ensure you've got a solid grasp of the subject, this quiz is tailored to provide a comprehensive and effective revision experience. Get ready to challenge yourself and confirm your mastery of biology. Let's get started and see how well you know your biology.
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- 2.
Which process describes the movement of water through a plant?
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Transcription
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Photosynthesis
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Transpiration
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Respiration
Correct Answer
A. TranspirationExplanation
Transpiration is the process through which water moves through plants from roots to leaves, then evaporates into the atmosphere primarily from the stomata in the leaves. This movement of water is crucial for the transport of nutrients from the soil, maintaining the structure of the plant, and cooling the plant on hot days. The process is driven by the evaporation of water at the leaf surface, creating a negative pressure that pulls water up from the roots through the xylem vessels.Rate this question:
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- 3.
What is the primary site of photosynthesis in plants?
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Roots
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Stems
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Flowers
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Leaves
Correct Answer
A. LeavesExplanation
Leaves are the primary site of photosynthesis in plants. This process involves converting light energy, usually from the sun, into chemical energy stored in glucose. Leaves are well-suited for this task due to their broad, flat surfaces which maximize light absorption. They contain chloroplasts, which are organelles that hold chlorophyll. Chlorophyll captures light energy, which is then used to convert carbon dioxide from the air and water from the soil into sugars and oxygen.Rate this question:
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- 4.
Which type of cell lacks a defined nucleus?
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Animal
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Plant
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Fungal
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Prokaryotic
Correct Answer
A. ProkaryoticExplanation
Prokaryotic cells, unlike eukaryotic cells of animals, plants, and fungi, do not have a defined nucleus. Instead, their genetic material is contained in a single, circular strand of DNA that floats freely within the cell in a region called the nucleoid. This lack of a membrane-bound nucleus and other organelles allows prokaryotes to have faster growth rates and simpler cellular organization, which are advantages in many environments.Rate this question:
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- 5.
What is the role of enzymes in the human body?
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Structural support
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Transmit nerve impulses
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Speed up chemical reactions
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Protect against diseases
Correct Answer
A. Speed up chemical reactionsExplanation
Enzymes are biological catalysts that speed up chemical reactions in the body without being consumed in the process. They work by lowering the activation energy required for reactions to occur, which allows essential biological processes to proceed quickly and efficiently at relatively low temperatures. This catalytic activity is crucial for digestion, metabolism, and many other regulatory and signaling pathways.Rate this question:
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- 6.
Which organelle is responsible for energy production in cells?
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Golgi apparatus
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Nucleus
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Mitochondrion
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Endoplasmic reticulum
Correct Answer
A. MitochondrionExplanation
The mitochondrion is known as the powerhouse of the cell because it produces adenosine triphosphate (ATP), the cell’s main energy currency. This process, known as cellular respiration, involves the conversion of the energy stored in glucose into ATP. Mitochondria have their own set of DNA and are involved in several other essential functions, including the regulation of the cell cycle and cell growth.Rate this question:
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- 7.
What is genetic material composed of in a cell?
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Proteins
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Lipids
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Carbohydrates
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Nucleic acids
Correct Answer
A. Nucleic acidsExplanation
Nucleic acids are the molecules that make up genetic material, which includes DNA and RNA. These molecules are vital for storing and transmitting genetic information from one generation to the next and are crucial for the synthesis of proteins. DNA molecules are composed of two strands forming a double helix, whereas RNA is typically single-stranded.Rate this question:
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- 8.
Which vitamin is essential for the coagulation of blood?
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Vitamin A
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Vitamin B12
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Vitamin C
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Vitamin K
Correct Answer
A. Vitamin KExplanation
Vitamin K is crucial for the synthesis of proteins required for blood coagulation. Without Vitamin K, the blood clotting process is severely impaired, leading to increased bleeding and bruising. This vitamin acts as a cofactor for an enzyme that catalyzes the carboxylation of specific protein residues, which is essential for activating the proteins that mediate clotting.Rate this question:
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- 9.
What process leads to the creation of gametes?
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Mitosis
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Meiosis
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Binary fission
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Budding
Correct Answer
A. MeiosisExplanation
Meiosis is a specialized type of cell division that results in four daughter cells, each with half the number of chromosomes of the parent cell. This process is essential for producing gametes in sexually reproducing organisms. It introduces genetic diversity through phases like crossing over and independent assortment, where different traits are mixed before the gametes are formed, contributing to genetic variation in populations.Rate this question:
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- 10.
Which hormone regulates the blood sugar level?
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Insulin
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Adrenaline
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Estrogen
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Thyroxine
Correct Answer
A. InsulinExplanation
Insulin is a hormone produced by the pancreas that regulates blood sugar levels. It facilitates the uptake of glucose from the blood into cells, where it can be used for energy, thereby lowering blood glucose levels. Insulin's role is critical in preventing hyperglycemia, a condition characterized by excessively high blood sugar levels that can lead to serious health problems, including diabetes type 2.Rate this question:
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Current Version
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Jul 17, 2024Quiz Edited by
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May 21, 2012Quiz Created by
Bio101
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