Miss Mono Academy
Grand Test - Answer Key & Explanations
30 MCQs Explained - Cell Structure to Digestive System
Cell Structure • Tissues/Organs • Cell Division • Organ Systems • Digestive System🔵 Topic 1: Cell Structure and Function
QUESTION 1
What is the basic structural and functional unit of all living organisms?
✅ B. Cell
The cell is the smallest unit that can carry out all life processes, so it's called the basic unit of life.
QUESTION 2
Which cell part controls what enters and leaves the cell?
✅ C. Cell Membrane
The cell membrane is selectively permeable — it decides which substances can pass in or out of the cell.
QUESTION 3
Which organelle is called the powerhouse of the cell?
✅ B. Mitochondria
Mitochondria produce energy (ATP) for the cell through respiration, so they're called the "powerhouse."
QUESTION 4
Which structure controls the cell's activities and contains DNA?
✅ C. Nucleus
The nucleus stores genetic material (DNA) and directs all cell activities, acting like the "control center."
QUESTION 5
Which of these is found only in plant cells?
✅ C. Cell Wall
The rigid cell wall (made of cellulose) is found in plant cells to give shape and support; animal cells don't have it.
QUESTION 6
Which organelle is the site of photosynthesis in plant cells?
✅ A. Chloroplast
Chloroplasts contain chlorophyll, which traps sunlight to make food through photosynthesis.
🟢 Topic 2: Tissues, Organs and Organ Systems
QUESTION 7
A group of similar cells performing the same function is called a:
✅ B. Tissue
Tissues are made of similar cells grouped together to perform one shared function.
QUESTION 8
Which tissue forms the covering or lining of body surfaces?
✅ C. Epithelial Tissue
Epithelial tissue covers the outer surface of the body and lines internal organs and cavities.
QUESTION 9
Which tissue is responsible for movement in the body?
✅ C. Muscular Tissue
Muscular tissue contracts and relaxes, producing movement in the body.
QUESTION 10
When two or more different tissues work together, they form a/an:
✅ C. Organ
An organ (like the heart or stomach) is formed when different tissues combine to perform a specific job.
QUESTION 11
What is the correct order of organization from simplest to most complex?
✅ B. Cell, Tissue, Organ, Organ System
This is the standard biological hierarchy: cells build tissues, tissues build organs, and organs build organ systems.
QUESTION 12
The basic unit of nervous tissue is called a:
✅ A. Neuron
Neurons are specialized cells that carry electrical signals, forming the basic unit of the nervous system.
🟠Topic 3: Cell Division - Mitosis and Meiosis
QUESTION 13
Which type of cell division produces two genetically identical daughter cells?
✅ B. Mitosis
Mitosis produces two daughter cells that are genetically identical to the parent cell — used for growth and repair.
QUESTION 14
How many daughter cells are produced at the end of meiosis?
✅ D. Four
Meiosis involves two divisions, producing four genetically different daughter cells (used in sexual reproduction).
QUESTION 15
What is the correct order of the stages of mitosis?
✅ B. Prophase, Metaphase, Anaphase, Telophase
Remember the order using "PMAT" — Prophase → Metaphase → Anaphase → Telophase.
QUESTION 16
How many chromosomes are normally found in a human body (somatic) cell?
✅ B. 46
A normal human body cell has 46 chromosomes (23 pairs); sex cells (sperm/egg) have half — 23.
QUESTION 17
Which type of cell division is responsible for growth and repair of the body?
✅ B. Mitosis
Mitosis replaces damaged cells and helps the body grow by producing identical new cells.
QUESTION 18
Why is meiosis important for sexual reproduction?
✅ B. It ensures offspring get the correct chromosome number after fertilization
Meiosis halves the chromosome number, so when sperm and egg join, the offspring gets the normal full number.
🟣 Topic 4: Organ Systems of the Human Body
QUESTION 19
How many major organ systems are generally described in the human body?
✅ D. Eleven
The human body is generally divided into 11 major organ systems (skeletal, muscular, nervous, digestive, etc.).
QUESTION 20
Which system controls and coordinates all body activities?
✅ B. Nervous System
The nervous system sends signals throughout the body to control and coordinate all activities.
QUESTION 21
Which system removes waste products from the body?
✅ C. Excretory System
The excretory system (kidneys, etc.) filters and removes waste products from the body.
QUESTION 22
Which system releases hormones to regulate body functions?
✅ A. Endocrine System
The endocrine system releases hormones into the blood to regulate growth, metabolism, and other functions.
QUESTION 23
Which system defends the body against disease and infection?
✅ B. Immune (Lymphatic) System
The immune system protects the body by fighting off pathogens and infections.
QUESTION 24
When all organ systems work together, they form a complete:
✅ D. Organism
When all organ systems function together, they form a complete living organism.
🔴 Topic 5: The Human Digestive System
QUESTION 25
Where does digestion of food begin?
✅ B. Mouth
Digestion starts in the mouth, where chewing and saliva begin breaking down food.
QUESTION 26
Where does most digestion and nutrient absorption take place?
✅ C. Small intestine
The small intestine is where most chemical digestion happens and where nutrients are absorbed into the blood.
QUESTION 27
Which organ produces bile to help digest fats?
✅ B. Liver
The liver produces bile, which is stored in the gallbladder and helps break down fats.
QUESTION 28
What is the main function of the large intestine?
✅ B. Absorb water from undigested food
The large intestine absorbs water from leftover undigested food, forming solid waste.
QUESTION 29
What is the wave-like muscle movement that pushes food through the esophagus called?
✅ B. Peristalsis
Peristalsis is the rhythmic muscle contraction that pushes food along the digestive tract.
QUESTION 30
What is the correct order of the digestive process?
✅ B. Ingestion, Digestion, Absorption, Assimilation, Egestion
Food is first ingested, then digested, nutrients are absorbed, used by cells (assimilation), and waste is egested.