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Question 1: What is considered the basic unit of life in all living organisms?
- Cell
- Tissue
- Molecule
- Atom
Answer: A. Cell
Explanation: The cell is the fundamental structural and functional unit of all living things, serving as the building block for life.
Question 2: According to cell theory, where do all new cells come from?
- Chemical reactions
- Non-living matter
- Spontaneous generation
- Pre-existing cells
Answer: D. Pre-existing cells
Explanation: Cell theory states that all cells arise from pre-existing cells through the process of cell division, ensuring continuity of life.
Question 3: Which process uses carbon dioxide, water, and energy to produce oxygen?
- Respiration
- Photosynthesis
- Fermentation
- Digestion
Answer: B. Photosynthesis
Explanation: Photosynthesis is the process by which plants and other organisms convert light energy into chemical energy, releasing oxygen as a byproduct.
Question 4: What is the primary role of decomposers in a food web?
- Consuming plants
- Breaking down matter
- Hunting prey
- Producing energy
Answer: B. Breaking down matter
Explanation: Decomposers break down dead organic matter, recycling nutrients back into the ecosystem so they can be used by other living organisms.
Question 5: What term describes an organism's ability to maintain a stable internal environment?
- Homeostasis
- Adaptation
- Evolution
- Metabolism
Answer: A. Homeostasis
Explanation: Homeostasis is the physiological process by which an organism regulates its internal conditions, such as temperature, to remain stable despite external changes.
Question 6: Which term refers to the observable physical traits of an organism?
- Chromosome
- Genotype
- Phenotype
- Mutation
Answer: C. Phenotype
Explanation: Phenotype refers to the observable characteristics of an individual, which result from the interaction of its genotype with the environment.
Question 7: What molecule carries the genetic instructions for living organisms?
- DNA
- Lipid
- Glucose
- Protein
Answer: A. DNA
Explanation: DNA contains the hereditary information that acts as the instruction manual for the development, function, and reproduction of all living organisms.
Question 8: What process causes traits that aid survival to become more common?
- Artificial breeding
- Genetic drift
- Natural selection
- Cell division
Answer: C. Natural selection
Explanation: Natural selection is the mechanism where individuals with advantageous traits are more likely to survive and reproduce, passing those traits to offspring.
Question 9: What is the correct hierarchy of organization in living things?
- Tissue, Cell, System, Organ
- Cell, Organ, Tissue, System
- Cell, Tissue, Organ, System
- System, Organ, Tissue, Cell
Answer: C. Cell, Tissue, Organ, System
Explanation: Living things are organized in a hierarchy where cells form tissues, tissues form organs, and organs work together to form organ systems.
Question 10: What process breaks down organic matter to release energy?
- Respiration
- Transpiration
- Absorption
- Photosynthesis
Answer: A. Respiration
Explanation: Respiration is the metabolic process that breaks down organic matter to release energy, essentially acting as the opposite of photosynthesis.