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Chapter 5· Tissues, Organs and Organ Systems
MCQs with Answers Try each one first: tap an option to check it, then read the reasoning and why the others are wrong.
A note about the questions
The wording follows published solved exercises and every answer was re-checked by hand, so the wording or the order of options may differ slightly from your print.
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Set A: Textbook exercise 10 MCQs The multiple-choice questions at the end of Chapter 5 in your book, in the book's option order.
Q5.1 Emergent Properties
A higher level of organization exhibits emergent properties when:
(a) Its parts function independently. (b) The sum of its parts is greater than the whole. (c) The individual parts are more important than the whole. (d) Its parts interact to perform more functions. Show answer and reasoning Answer (d) Its parts interact to perform more functions.
Step by step
Interaction → new abilities not present in the parts. Why the others are wrong
(a) independent parts give no new property.(b) reversed: the whole is greater than the sum of its parts.(c) Wrong.Remember
Emerge = come out of teamwork.
Q5.2 Levels of Organization
Which of the following demonstrates the levels of organization of the body, from simplest to most complex?
(a) Cell → Organ → Tissue → Organelle → Organ system (b) Organelle → Cell → Tissue → Organ → Organ system (c) Tissue → Cell → Organelle → Organ → Organ system (d) Organ system → Tissue → Cell → Organelle → Organ Show answer and reasoning Answer (b) Organelle → Cell → Tissue → Organ → Organ system
Step by step
Organelles make cells, cells make tissues, tissues make organs. Why the others are wrong
(a) tissue comes before organ.(c) organelle is simplest.(d) reversed.Remember
O-C-T-O-O: Organelle, Cell, Tissue, Organ, Organ system.
Q5.3 Human Organ Systems
At which level of organization gas exchange occurs between body and environment?
(a) Organelle level in mitochondria (b) Cellular level in alveolar cells (c) Tissue level in epithelial tissues (d) Organ system level in the respiratory system Show answer and reasoning Answer (d) Organ system level in the respiratory system
Step by step
Body ↔ environment exchange needs the whole system: airways + lungs. Why the others are wrong
(a) mitochondria use O₂ inside cells.(b) cells alone cannot exchange with the environment.(c) a tissue alone is not enough.Remember
Body-environment exchange = respiratory system.
Q5.4 Human Organs and Stomach
The epithelial tissue in the stomach wall is responsible for producing:
(a) Mucus (b) Pepsinogen (c) Hydrochloric acid (d) All of these Show answer and reasoning Answer (d) All of these
Step by step
Mucus protects; HCl activates pepsinogen to pepsin. Why the others are wrong
(a) not only mucus.(b) not only pepsinogen.(c) not only HCl.Remember
Stomach epithelium makes all three.
Q5.5 Human Organs and Stomach
In the wall of stomach, which tissue also contains blood vessels and nerves?
(a) Epithelial (b) Muscle (c) Inner connective (d) Outer connective Show answer and reasoning Answer (c) Inner connective
Step by step
Layers inside out: epithelium → connective (vessels, nerves) → muscle → outer connective. Why the others are wrong
(a) secretes mucus and juice.(b) churns food.(d) outer covering for support.Remember
Inner connective = supply layer.
Q5.6 Plant Organs and Leaf
In a leaf, which tissue is responsible for photosynthesis?
(a) Xylem (b) Mesophyll (c) Epidermis (d) Phloem Show answer and reasoning Answer (b) Mesophyll
Step by step
Palisade + spongy mesophyll. Why the others are wrong
(a) water.(c) protection.(d) sugar transport.Remember
Mesophyll = middle green tissue.
Q5.7 Plant Organs and Leaf
What is the primary function of the xylem tissue in a leaf?
(a) To transport sugars to other parts (b) To transport water to parts of leaf (c) To synthesize chlorophyll (d) To control the opening and closing of stomata Show answer and reasoning Answer (b) To transport water to parts of leaf
Step by step
Xylem = water; phloem = food. Why the others are wrong
(a) phloem.(c) Wrong.(d) guard cells.Remember
X for water (xylem), P for products (phloem).
Q5.8 Human Organ Systems
Which of these is a function of the human skeletal system?
(a) Storing minerals and producing blood cells (b) Removing carbon dioxide from blood (c) Filtering blood to remove waste products (d) Breaking down food for energy Show answer and reasoning Answer (a) Storing minerals and producing blood cells
Step by step
CO₂ removal: respiratory; filtering: kidneys; food: digestive. Why the others are wrong
(b) respiratory system.(c) kidneys.(d) digestive system.Remember
Bones store calcium and make blood.
Q5.9 Plant Organs and Leaf
Which structures are responsible for the transport of food in plant body?
(a) Xylem tissue (b) Palisade mesophyll (c) Phloem tissue (d) Spongy mesophyll Show answer and reasoning Answer (c) Phloem tissue
Step by step
Phloem = food. Why the others are wrong
(a) water.(b) photosynthesis.(d) gas diffusion and photosynthesis.Remember
Phloem = food flow.
Q5.10 Plant Organs and Leaf
In a plant, which of the following is the primary function of the flower?
(a) Transporting water and minerals (b) Supporting leaf growth (c) Facilitating reproduction through pollination (d) Regulating gas exchange Show answer and reasoning Answer (c) Facilitating reproduction through pollination
Step by step
Water: stem/root; gas exchange: leaves. Why the others are wrong
(a) vascular tissue.(b) stem.(d) stomata.Remember
Flower = reproduction.
Set B: More MCQs from this chapter 14 MCQs Extra questions on the same ideas, of the kind set in board papers and class tests.
QB1 Levels of Organization
A group of similar cells that work together to perform one or more specific functions is called:
(a) an organ (b) a tissue (c) an organ system (d) an organelle Show answer and reasoning Answer (b) a tissue
Step by step
Similar cells → tissue; different tissues → organ. Why the others are wrong
(a) made of tissues.(c) made of organs.(d) inside a cell.Remember
Similar cells = tissue.
QB2 Levels of Organization
The smallest unit of matter that maintains the property of an element is:
(a) molecule (b) cell (c) organelle (d) atom Show answer and reasoning Answer (d) atom
Step by step
Atoms combine to make molecules. Why the others are wrong
(a) atoms combined.(b) smallest unit of life.(c) Wrong.Remember
Atom = level one.
QB3 Levels of Organization
Which of the following is an organ in plants?
(a) Leaf (b) Epidermis (c) Xylem (d) Mesophyll Show answer and reasoning Answer (a) Leaf
Step by step
Several tissues together = organ. Why the others are wrong
(b) a tissue.(c) a tissue.(d) a tissue.Remember
Leaf = organ; its layers = tissues.
QB4 Emergent Properties
Consciousness and thinking are emergent properties that arise at the level of:
(a) organelles (b) cells (c) tissues (d) the organism (organ systems interacting) Show answer and reasoning Answer (d) the organism (organ systems interacting)
Step by step
Not present in single organ systems. Why the others are wrong
(a) Wrong.(b) Wrong.(c) Wrong.Remember
Highest level → highest abilities.
QB5 Plant Organs and Leaf
Which leaf tissue consists of tightly packed elongated cells just beneath the upper epidermis?
(a) Palisade mesophyll (b) Spongy mesophyll (c) Phloem (d) Lower epidermis Show answer and reasoning Answer (a) Palisade mesophyll
Step by step
Palisade = upright fence-like cells. Why the others are wrong
(b) loose, with air spaces.(c) Wrong.(d) Wrong.Remember
Palisade = packed; spongy = spaces.
QB6 Plant Organs and Leaf
The waxy cuticle on the upper epidermis of a leaf mainly:
(a) transports sugar (b) makes food (c) reduces water loss (d) absorbs minerals Show answer and reasoning Answer (c) reduces water loss
Step by step
Wax is waterproof. Why the others are wrong
(a) phloem.(b) mesophyll.(d) roots.Remember
Wax keeps water in.
QB7 Plant Organ Systems
The two main organ systems of plants are:
(a) xylem and phloem (b) digestive and nervous systems (c) root system and shoot system (d) leaf and flower systems Show answer and reasoning Answer (c) root system and shoot system
Step by step
Plants are non-moving, so their systems are less complex. Why the others are wrong
(a) tissues.(b) animals.(d) organs of the shoot system.Remember
Root below, shoot above.
QB8 Human Organs and Stomach
The three layers of smooth muscle in the stomach wall are arranged as:
(a) outer longitudinal, middle circular, inner oblique (b) outer circular, middle oblique, inner longitudinal (c) all longitudinal (d) outer oblique, middle longitudinal, inner circular Show answer and reasoning Answer (a) outer longitudinal, middle circular, inner oblique
Step by step
L-C-O from outside in. Why the others are wrong
(b) Wrong.(c) Wrong.(d) Wrong.Remember
"Long Circle Oblique" outside → inside.
QB9 Human Organs and Stomach
The hormones insulin and glucagon are produced by the:
(a) liver (b) stomach (c) kidneys (d) pancreas Show answer and reasoning Answer (d) pancreas
Step by step
Insulin lowers blood glucose. Why the others are wrong
(a) bile, stores glucose.(b) gastric juice.(c) urine.Remember
Pancreas → insulin.
QB10 Human Organ Systems
The brain, spinal cord and nerves make up the:
(a) nervous system (b) skeletal system (c) muscular system (d) circulatory system Show answer and reasoning Answer (a) nervous system
Step by step
Impulses → nervous system. Why the others are wrong
(b) bones.(c) muscles.(d) heart and vessels.Remember
Brain + cord + nerves = nervous.
QB11 Homeostasis
The ability of an organism to maintain a stable internal environment despite external changes is:
(a) homeostasis (b) metabolism (c) transpiration (d) differentiation Show answer and reasoning Answer (a) homeostasis
Step by step
Homeo = same, stasis = standing. Why the others are wrong
(b) all chemical reactions.(c) water loss from leaves.(d) specialization.Remember
Homeostasis = keeping the same.
QB12 Homeostasis
When body temperature rises above 37 °C, the body cools itself by:
(a) shivering (b) sweating (c) releasing insulin (d) slowing breathing Show answer and reasoning Answer (b) sweating
Step by step
Hot → sweat; cold → shiver. Why the others are wrong
(a) warms the body.(c) blood sugar.(d) Wrong.Remember
Sweat cools; shiver warms.
QB13 Homeostasis
After drinking juice, blood glucose is brought back to normal by the hormone:
(a) glucagon (b) pepsin (c) insulin (d) adrenaline Show answer and reasoning Answer (c) insulin
Step by step
Glucagon raises glucose; insulin lowers it. Why the others are wrong
(a) raises glucose.(b) an enzyme.(d) Wrong.Remember
Insulin = in to cells, glucose down.
QB14 Homeostasis
Which organ system regulates water and salt balance and so maintains blood volume and pressure?
(a) Integumentary system (b) Urinary system (c) Skeletal system (d) Respiratory system Show answer and reasoning Answer (b) Urinary system
Step by step
Kidneys filter blood and make urine. Why the others are wrong
(a) barrier and sweating.(c) support.(d) gases.Remember
Kidneys balance water and salt.
