This is the real Level 1 question set — 20 questions, free, no account needed.
Tap a question to check your answer and read the explanation.
1. Chloroplasts are found mainly in plant cells because they are responsible for
A. Respiration
B. Photosynthesis
C. Excretion
D. Protein synthesis
Explanation: Chloroplasts contain chlorophyll, which traps light energy used in photosynthesis, a process that occurs mainly in green plant cells.
2. When a plant cell is placed in a concentrated salt solution, it loses water by a process called
A. Plasmolysis
B. Photosynthesis
C. Transpiration
D. Respiration
Explanation: Plasmolysis occurs when a plant cell loses water through osmosis in a hypertonic (concentrated) solution, causing the cytoplasm to shrink away from the cell wall.
3. The gas taken in by animals during respiration is ___.
A. carbon dioxide
B. nitrogen
C. oxygen
D. hydrogen
Explanation: Aerobic respiration uses oxygen and releases carbon dioxide.
4. The instrument commonly used in secondary school laboratories to observe the structure of cells is the
A. Barometer
B. Microscope
C. Thermometer
D. Hydrometer
Explanation: A microscope magnifies small objects like cells so that their structures can be seen clearly, since cells are too small to be seen with the naked eye.
5. A red blood cell in humans lacks a nucleus mainly to
A. Increase its size
B. Create more space for carrying oxygen
C. Prevent it from dividing rapidly
D. Make it lighter in colour
Explanation: Mature human red blood cells lose their nucleus to create more space for haemoglobin, which increases their capacity to carry oxygen.
6. Which organelle is responsible for packaging and secreting substances such as enzymes out of the cell?
A. Golgi apparatus
B. Mitochondrion
C. Nucleolus
D. Cell membrane
Explanation: The Golgi apparatus packages proteins and other substances into vesicles for secretion out of the cell or for use within the cell.
7. The main chemical substance that makes up the cell wall of a typical plant cell is
A. Chitin
B. Cellulose
C. Protein
D. Glycogen
Explanation: The plant cell wall is made mainly of cellulose, a complex carbohydrate that gives strength and rigidity to the cell.
8. In a mature plant cell, the large central vacuole is mainly filled with
A. Air
B. Cell sap
C. Blood
D. Mucus
Explanation: The large central vacuole in plant cells is filled with cell sap, which helps maintain turgidity and stores nutrients and waste products.
9. The movement of molecules from a region of higher concentration to a region of lower concentration without the use of energy is called
A. Osmosis
B. Active transport
C. Diffusion
D. Endocytosis
Explanation: Diffusion is the passive movement of molecules from a region of higher concentration to a region of lower concentration, requiring no energy input.
10. Ribosomes in a cell are mainly responsible for
A. Protein synthesis
B. Lipid storage
C. Water regulation
D. Cellular respiration
Explanation: Ribosomes are the sites where amino acids are joined together to form proteins during protein synthesis.
11. The structure that controls the activities of the cell and contains the hereditary material is the
A. Vacuole
B. Nucleus
C. Chloroplast
D. Cell membrane
Explanation: The nucleus contains chromosomes made of DNA, which carry hereditary information and control the cell's activities.
12. Which process moves water from the soil into root hair cells?
A. active transport
B. osmosis
C. transpiration
D. respiration
Explanation: Water moves down a water-potential gradient by osmosis.
13. An organism whose body is made up of only one cell is called a
A. Multicellular organism
B. Tissue
C. Unicellular organism
D. Organ
Explanation: A unicellular organism, such as an amoeba, is made up of only a single cell that performs all life functions.
14. The jelly-like substance that fills the cell and contains the organelles is called the
A. Nucleolus
B. Cytoplasm
C. Cell wall
D. Chromatin
Explanation: The cytoplasm is the jelly-like substance in which the cell organelles are suspended, and it is the site of many metabolic reactions.
15. Photosynthesis in a green plant mainly takes place in the ___.
A. root hairs
B. xylem
C. palisade cells of the leaf
D. flower
Explanation: Palisade mesophyll cells are packed with chloroplasts near the leaf surface.
16. The network of tubes and sacs that transports materials within the cell and is continuous with the nuclear membrane is the
A. Golgi apparatus
B. Endoplasmic reticulum
C. Lysosome
D. Centriole
Explanation: The endoplasmic reticulum is a network of membranes that transports materials within the cell and is connected to the nuclear membrane.
17. The cell is regarded as the basic unit of life because it is the smallest structure that can
A. Move from one place to another
B. Carry out all the processes necessary for life
C. Be seen without a microscope
D. Produce sound when broken
Explanation: The cell is the basic unit of life because it is the smallest unit capable of performing all life processes such as respiration, nutrition, growth and reproduction.
18. In a food chain, herbivores are also called ___.
A. producers
B. primary consumers
C. decomposers
D. tertiary consumers
Explanation: Herbivores feed directly on producers, so they are primary consumers.
19. The structure that controls the activities of a cell is the ___.
A. cell wall
B. nucleus
C. vacuole
D. cytoplasm
Explanation: The nucleus contains DNA and directs cell activities.
20. The type of cell division that results in growth and repair of body tissues in humans is called
A. Meiosis
B. Mitosis
C. Fertilization
D. Binary fission
Explanation: Mitosis is the type of cell division that produces two identical daughter cells and is responsible for growth and repair of body tissues.
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