Biology Quiz Questions
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23 questions · Updated August 2026
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1. Which of the following characteristics are typical of mammals?
- Scales
- Feathers
- Presence of mammary glands
- Warm-blooded
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Correct answers: Presence of mammary glands, Warm-blooded
Explanation: Mammals are characterized by the presence of mammary glands, which allow females to nurse their young, and they are warm-blooded, maintaining a constant body temperature. Feathers and scales are characteristics of birds and reptiles, respectively, highlighting the diversity of animal adaptations across different classes.
2. True or False: All living organisms are composed of cells.
- True
- False
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Correct answer: True
Explanation: The cell theory states that all living organisms are made of cells, which are the basic units of life.
3. Fill in the blank: The basic unit of life is the ____.
- tissue
- cell
- organism
- organ
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Correct answer: cell
Explanation: Cells are the fundamental units of structure and function in all living organisms.
4. What order do the asteroidea belong to?
- Jellyfish
- Corals
- Sea urchins
- Starfish
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Correct answer: Starfish
Explanation: Asteroidea is the scientific class name for starfish, which are known for their unique radial symmetry and regeneration capabilities.
5. Which organelle is known as the powerhouse of the cell?
- Endoplasmic Reticulum
- Nucleus
- Golgi Apparatus
- Mitochondria
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Correct answer: Mitochondria
Explanation: Mitochondria are responsible for producing ATP, the energy currency of the cell, through cellular respiration.
6. Which of the following is a primary producer in an ecosystem?
- Decomposer
- Rabbit
- Fox
- Grass
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Correct answer: Grass
Explanation: Primary producers, such as grass, create energy through photosynthesis and form the base of the food chain.
7. Fill in the blank: The study of interactions between organisms and their environment is called ____.
- biology
- zoology
- ecology
- botany
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Correct answer: ecology
Explanation: Ecology is the branch of biology that deals with the relationships of organisms to one another and to their physical environment.
8. Which of the following is a characteristic of all living things?
- Respiration
- Movement
- Reproduction
- Photosynthesis
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Correct answer: Reproduction
Explanation: Reproduction is a fundamental characteristic of all living organisms, allowing for the continuation of species.
9. Fill in the blank: The process by which plants convert sunlight into energy is called ____.
- photosynthesis
- cellular respiration
- transpiration
- fermentation
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Correct answer: photosynthesis
Explanation: Photosynthesis is the process where plants use sunlight to convert carbon dioxide and water into glucose and oxygen.
10. True or False: The process of photosynthesis occurs in the mitochondria of plant cells.
- True
- False
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Correct answer: False
Explanation: Photosynthesis occurs in the chloroplasts of plant cells, not in the mitochondria.
11. Would you rather study mammals or amphibians?
- Amphibians
- Mammals
12. Which scientist is known for the theory of evolution by natural selection?
- Albert Einstein
- Gregor Mendel
- Charles Darwin
- Louis Pasteur
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Correct answer: Charles Darwin
Explanation: Charles Darwin proposed the theory of evolution by natural selection in his book 'On the Origin of Species' published in 1859.
13. Which of the following structures is responsible for protein synthesis in the cell?
- Vesicle
- Ribosome
- Chloroplast
- Lysosome
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Correct answer: Ribosome
Explanation: Ribosomes are the sites of protein synthesis, translating messenger RNA into polypeptide chains.
14. Fill in the blank: In ecology, a group of organisms of the same species living in the same area is called a ____.
- population
- community
- habitat
- ecosystem
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Correct answer: population
Explanation: A population refers to the number of individuals of the same species living in a specific area.
15. Fill in the blank: Gregor Mendel is known as the father of ____.
- molecular biology
- microbiology
- evolution
- genetics
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Correct answer: genetics
Explanation: Gregor Mendel is recognized for his foundational work in genetics through his pea plant experiments.
16. Which of the following is an example of an abiotic factor in an ecosystem?
- Temperature
- Fish
- Trees
- Bacteria
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Correct answer: Temperature
Explanation: Abiotic factors are non-living components, such as temperature, that affect ecosystems.
17. True or False: All reptiles are cold-blooded.
- False
- True
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Correct answer: False
Explanation: While most reptiles are cold-blooded, some species, like certain types of lizards, can regulate their body temperature through behavioral adaptations.
18. True or False: The human genome is composed of approximately 20,000-25,000 genes.
- False
- True
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Correct answer: True
Explanation: The estimated number of genes in the human genome is indeed around 20,000-25,000.
19. Which type of symbiotic relationship benefits one organism while harming another?
- Parasitism
- Amensalism
- Mutualism
- Commensalism
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Correct answer: Parasitism
Explanation: In parasitism, one organism benefits at the expense of another, often harming it in the process.
20. True or False: Human cells have a larger volume than bacterial cells.
- True
- False
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Correct answer: True
Explanation: Human cells are typically much larger than bacterial cells, which are prokaryotic and usually range from 0.1 to 15 micrometers.
21. True or False: All insects have six legs.
- True
- False
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Correct answer: False
Explanation: While most insects have six legs, some species, like certain larval stages, may have different leg counts, especially before they mature.
22. Which type of plant is characterized by having vascular tissue?
- Angiosperms
- Fungi
- Liverworts
- Mosses
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Correct answer: Angiosperms
Explanation: Angiosperms are vascular plants that produce flowers and seeds, distinguishing them from non-vascular plants like mosses.
23. In the context of genetics, what does the root 'gen' signify in the word 'genotype'?
- Change or transformation
- Origin or birth
- Inheritance only
- Appearance or form
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Correct answer: Origin or birth
Explanation: 'Gen' comes from the Greek word 'genes', meaning 'born of' or 'origin'. It is crucial for understanding concepts related to genetics, such as traits and inheritance patterns.
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