The Nature And Variety Of Living Organisms All subtopics
Which characteristic of living organisms specifically involves chemical reactions inside cells that release energy from nutrient molecules?
A student observes that a candle flame moves, produces CO₂, and appears to “grow” as wax melts upward. She concludes that fire is alive. What is the strongest reason this conclusion is incorrect?
A doctor measures a patient’s blood urea concentration. Which characteristic of life is directly responsible for producing the urea found in this patient’s blood?
Distinguish between excretion and egestion. Which of the following correctly identifies an example of each?
Viruses can be crystallised and stored in a jar indefinitely, yet when they enter a host cell they produce thousands of copies of themselves. Which statement best explains why viruses are not classified as living organisms?
Which of the following best defines homeostasis?
An amoeba is a single-celled organism that lives in pond water. It engulfs food particles, breaks down glucose to release energy, expels waste products such as CO₂, detects and moves away from harmful chemicals, divides to form two daughter cells, and regulates its internal water content. Based on this information, which conclusion is correct?
A student uses the mnemonic MRS GREN H to recall the characteristics of life. She remembers seven but forgets one. She has listed: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition. Which characteristic is she missing?
A deep-sea hydrothermal vent bacterium lives in total darkness at 80°C. It obtains energy from hydrogen sulfide dissolved in the water, produces ATP through chemical reactions in its cells, expels waste substances, and divides every 40 minutes. A student claims this organism is not alive because it does not eat food or use sunlight. Is the student correct?
Which of the following correctly pairs a characteristic of life with its definition?
A student writes the following exam answer: “Plants do not respire. They only carry out photosynthesis.” Identify the error in this statement.
A forensic scientist examines a mysterious substance found at a crime scene. It increases in size over several days, appears to respond when touched, and chemical analysis shows it produces CO₂. However, testing reveals it cannot reproduce and has no mechanism for controlling its internal conditions. Based on the characteristics of life, what is the most appropriate conclusion?
Which statement correctly describes a feature shared by all plants?
A student observes a cell under a microscope and notes that it has no chloroplasts, no cell wall, and stores carbohydrate as glycogen. The organism is multicellular. Which group does this organism most likely belong to?
Which pair correctly matches each organism to its storage carbohydrate?
Describe how fungi obtain their nutrients. Which statement includes both steps required for full marks?
A researcher discovers a microscopic, single-celled eukaryotic organism in pond water. It contains chloroplasts and has a cell wall. Which organism does it most closely resemble?
Which statement correctly explains why bacteria are classified as prokaryotic organisms?
Plasmodium causes malaria in humans. Through which route is Plasmodium transmitted to a human host?
A student writes: “Fungi and plants both have cell walls, so they must be in the same kingdom.” State which part of this reasoning is flawed.