Control and Coordination Class 10 Best MCQs. Understand Control and Coordination for Class 10: Explore movement in living things, the nervous system (neurons, nerve impulses, reflex actions, brain parts like forebrain, mid-brain, hindbrain, cerebellum, medulla), and protection of the brain and spinal cord.
Learn about how nervous and muscular tissues cause action. Discover coordination in plants (growth-dependent and independent movements, tropisms like phototropism and geotropism, plant hormones like auxin, gibberellin) and chemical coordination in animals through the endocrine system (hormones like adrenaline, thyroxine, insulin, growth hormone) and feedback mechanisms.
Control and Coordination Class 10 Best MCQs topics:
Introduction to Control and Coordination (MCQ 1–3)
Nervous System in Animals: Structure and Function (MCQ 4–10)
Reflex Actions (MCQ 11–13)
Central and Peripheral Nervous Systems (MCQ 14–15)
Voluntary and Involuntary Actions (MCQ 16)
The Human Brain: Structure and Functions (MCQ 17–24)
Protection of the Brain and Spinal Cord (MCQ 25–35)
Muscle Action and Movement in Animals (MCQ 36–46)
Control and Coordination in Plants: Introduction (MCQ 47–48)
Growth-Dependent Movements in Plants (Tropisms) (MCQ 49)
Growth-Independent Movements in Plants (Nastic) (MCQ 50–55)
Plant Hormones: Introduction and Auxin (MCQ 65–66)
Other Plant Hormones (Gibberellin, Cytokinin, ABA, Ethylene) (MCQ 67–74)
Chemical Coordination in Animals: Hormones (MCQ 75–79)
Adrenaline: Function and Effects (MCQ 80–85)
Other Animal Hormones and Their Functions (MCQ 86–96)
Feedback Mechanisms in Hormone Regulation (MCQ 97–100)
Control and Coordination Class 10 Best MCQs – Mock Online Test
Question 1: How is movement related to life?
A. All living things move.
B. Movement indicates a response to the environment.
C. Only animals move, not plants
D. Movement is essential for survival.
B. Movement is often seen as a response to changes in the environment, a characteristic of living organisms.
Question 2: What is the significance of controlled movement in living organisms?
A. It helps them avoid danger
B. It allows them to find food
C. It enables them to interact with their environment
D. All of the above
D. Controlled movement is crucial for survival and interaction with the surroundings.
Question 3: Why do multicellular organisms require control and coordination systems?
A. To maintain homeostasis
B. To respond to stimuli
C. To regulate various bodily functions
D. All of the above
D. Multicellular organisms need these systems to integrate and manage their complex functions.
Question 4: What are the primary tissues responsible for control and coordination in animals?
A. Nervous and muscular tissues
B. Epithelial and connective tissues
C. Blood and lymph tissues
D. Bone and cartilage tissues
A. Nervous tissue transmits signals, and muscular tissue responds by contracting or relaxing.
Question 5: What is the basic structural and functional unit of the nervous system?
A. Neuron
B. Nephron
C. Axon
D. Dendrite
A. Neurons are specialized cells that transmit electrical and chemical signals.
Question 6: How are nerve impulses transmitted?
A. Through electrical signals only
B. Through chemical signals only
C. Through both electrical and chemical signals
D. Through hormonal signals
C. Nerve impulses involve electrical signals within a neuron and chemical signals at synapses.
Question 7: Which sense organs are associated with gustatory and olfactory receptors, respectively?
A. Tongue and nose
B. Eyes and ears
C. Skin and muscles
D. Heart and lungs
A. Gustatory receptors are responsible for taste (tongue), and olfactory receptors for smell (nose).
Question 8: What is the function of a receptor in the nervous system?
A. To carry messages to the brain
B. To detect changes in the environment
C. To control muscle movement
D. To produce hormones
B. Receptors are specialized nerve endings that detect stimuli like light, sound, touch, etc.
Question 9: What is a reflex action?
A. A voluntary response to a stimulus
B. An involuntary and rapid response to a stimulus
C. A slow and deliberate response to a stimulus
D. A learned behavior
B. Reflex actions are automatic, quick responses that help protect the body from harm.
Question 10: How do reflex actions differ from conscious actions?
A. Reflex actions are faster
B. Reflex actions do not involve the brain
C. Reflex actions are involuntary
D. All of the above
D. Reflex actions are rapid, involuntary responses that primarily involve the spinal cord, while conscious actions are deliberate and involve the brain.
Question 11: What is the pathway of a reflex action called?
A. Reflex arc
B. Nerve impulse
C. Synapse
D. Neuron
A. The reflex arc is the neural pathway that mediates a reflex action.
Question 12: What is the role of the spinal cord in reflex actions?
A. It processes sensory information
B. It initiates voluntary movements
C. It acts as a relay center for reflex actions
D. It produces hormones
C. The spinal cord can process simple reflexes without involving the brain, enabling quick responses.
Question 13: Which of the following is an example of a reflex action?
A. Blinking your eyes when something flies towards them
B. Kicking a ball
C. Raising your hand to answer a question
D. Writing your name
A. Blinking in response to a sudden stimulus is a reflex action.
Question 14: What constitutes the central nervous system (CNS)?
A. Brain and spinal cord
B. Cranial and spinal nerves
C. Sense organs and muscles
D. Heart and lungs
A. The brain and spinal cord are the main components of the CNS, responsible for processing and integrating information.
Question 15: What is the function of the peripheral nervous system (PNS)?
A. To connect the CNS to the rest of the body
B. To process sensory information
C. To initiate voluntary movements
D. To produce hormones
A. The PNS comprises nerves that carry information to and from the CNS.
Question 16: Which actions are under conscious control?
A. Voluntary actions
B. Involuntary actions
C. Reflex actions
D. None of the above
A. Voluntary actions are those that we consciously decide to perform.
Question 17: What are the three major parts of the human brain?
A. Cerebrum, cerebellum, and brainstem
B. Fore-brain, mid-brain, and hind-brain
C. Frontal lobe, parietal lobe, and occipital lobe
D. Sensory areas, association areas, and motor areas
B. The human brain is broadly divided into the fore-brain, mid-brain, and hind-brain.
Question 18: Which part of the brain is responsible for thinking and decision-making?
A. Fore-brain
B. Mid-brain
C. Hind-brain
D. Spinal cord
A. The fore-brain is the most developed part of the brain and is associated with higher-order functions like thinking, memory, and perception.
Question 19: Where are sensory areas, association areas, and motor areas located in the brain?
A. Fore-brain
B. Mid-brain
C. Hind-brain
D. Spinal cord
A. These areas are primarily located in the fore-brain and are responsible for processing sensory information, integrating it, and initiating motor responses.
Question 20: Which parts of the brain control involuntary actions?
A. Fore-brain and mid-brain
B. Mid-brain and hind-brain
C. Hind-brain and spinal cord
D. Fore-brain and spinal cord
B. The mid-brain and hind-brain control vital functions like breathing, heart rate, and digestion.
Question 21: What is the function of the medulla oblongata?
A. Controls voluntary movements
B. Regulates balance and coordination
C. Controls involuntary actions like breathing and heart rate
D. Processes sensory information
C. The medulla oblongata is a part of the hind-brain that controls vital involuntary functions.
Question 22: Which part of the brain is responsible for maintaining posture and balance?
A. Cerebrum
B. Cerebellum
C. Medulla oblongata
D. Spinal cord
B. The cerebellum, located in the hind-brain, coordinates muscle movements and maintains balance.
Question 23: Which part of the brain is responsible for precision of voluntary actions?
A. Cerebrum
B. Cerebellum
C. Medulla oblongata
D. Spinal cord
B. The cerebellum coordinates muscle movements for precise and smooth voluntary actions.
Question 24: The sensation of feeling full is because of a centre associated with hunger. This centre is located in which part of the brain?
A. Fore-brain
B. Mid-brain
C. Hind-brain
D. Spinal cord
A. The fore-brain houses various centers, including those associated with hunger and satiety.
Question 25: How is the brain protected?
A. By the skull
B. By cerebrospinal fluid
C. By meninges (protective membranes)
D. All of the above
D. The brain is protected by the bony skull, cerebrospinal fluid that cushions it, and meninges that provide additional layers of protection.
Question 26: What is the function of the vertebral column?
A. To protect the brain
B. To protect the spinal cord
C. To support the body
D. To produce blood cells
B. The vertebral column, or backbone, encloses and protects the delicate spinal cord.
Question 27: What is the role of cerebrospinal fluid (CSF)?
A. It provides nutrients to the brain
B. It removes waste products from the brain
C. It acts as a shock absorber for the brain
D. All of the above
D. CSF serves multiple functions, including providing nourishment, removing waste, and cushioning the brain.
Question 28: Which of the following structures provides the first line of defense for the brain?
A. Skull
B. Cerebrospinal fluid
C. Meninges
D. Vertebral column
A. The skull is the outermost protective layer for the brain.
Question 29: The delicate spinal cord is protected by:
A. The skull
B. The rib cage
C. The vertebral column
D. The pelvis
C. The vertebral column provides a bony enclosure for the spinal cord, safeguarding it from injury.
Question 30: Which of the following is NOT a function of the meninges?
A. Protecting the brain from physical trauma
B. Providing a pathway for blood vessels
C. Producing cerebrospinal fluid
D. Anchoring the brain within the skull
C. Cerebrospinal fluid is produced by specialized structures within the brain, not the meninges.
Question 31: The fluid-filled balloon that surrounds the brain helps to:
A. Provide nutrients to the brain
B. Absorb shocks and protect the brain from injury
C. Regulate the temperature of the brain
D. Produce electrical signals
B. The fluid-filled balloon, containing cerebrospinal fluid, acts as a cushion, reducing the impact of any blows or sudden movements.
Question 32: Which of the following statements about the protection of the brain is INCORRECT?
A. The skull is a hard, bony structure that encases the brain
B. The meninges are three layers of membranes that cover the brain
C. Cerebrospinal fluid fills the space between the skull and the brain
D. The vertebral column protects the brain from injury
D. The vertebral column protects the spinal cord, not the brain.
Question 33: The main function of the bony structures surrounding the central nervous system is to:
A. Provide support for the body
B. Produce blood cells
C. Protect the delicate nervous tissue from damage
D. Regulate body temperature
C. The skull and vertebral column primarily serve a protective function for the brain and spinal cord, respectively.
Question 34: Which of the following is an example of a protective mechanism for the nervous system?
A. Reflex actions
B. The blood-brain barrier
C. The presence of cerebrospinal fluid
D. All of the above
D. All the mentioned options contribute to protecting the nervous system in different ways.
Question 35: The blood-brain barrier is a specialized structure that:
A. Prevents harmful substances from entering the brain
B. Allows all substances to freely pass into the brain
C. Regulates the flow of blood to the brain
D. Produces cerebrospinal fluid
A. The blood-brain barrier selectively controls the passage of molecules from the blood into the brain, protecting it from potentially harmful substances.
Question 36: How does nervous tissue cause muscle action?
A. By releasing hormones
B. By sending electrical impulses
C. By changing its shape
D. By producing enzymes
B. Nervous tissue transmits electrical impulses to muscle fibers, triggering their contraction.
Question 37: What is the role of specialized proteins in muscle contraction?
A. They provide energy for contraction
B. They change their shape and arrangement in response to nerve impulses
C. They produce electrical signals
D. They transport oxygen to the muscles
B. Specialized proteins like actin and myosin interact and slide past each other, leading to muscle fiber shortening.
Question 38: Which type of muscle is responsible for voluntary movements like walking and talking?
A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. None of the above
A. Skeletal muscles are attached to bones and are under conscious control.
Question 39: Which type of muscle is found in the walls of internal organs like the stomach and intestines?
A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. None of the above
B. Smooth muscles are involuntary muscles found in the walls of organs, controlling functions like digestion and blood vessel constriction.
Question 40: Which type of muscle is responsible for the rhythmic contractions of the heart?
A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. None of the above
C. Cardiac muscle is unique to the heart and has the ability to generate its own electrical impulses for continuous contractions.
Question 41: Which of the following is an example of an involuntary muscle action?
A. Breathing
B. Lifting a weight
C. Writing
D. Kicking a ball
A. Breathing is controlled by involuntary muscles, ensuring continuous respiration even when we are not consciously thinking about it.
Question 42: The connection between a motor neuron and a muscle fiber is called:
A. Synapse
B. Neuromuscular junction
C. Reflex arc
D. Axon terminal
B. The neuromuscular junction is the specialized synapse where a motor neuron communicates with a muscle fiber.
Question 43: Which of the following statements about muscle contraction is FALSE?
A. Muscle contraction requires energy
B. Muscle contraction involves the interaction of specialized proteins
C. Muscle contraction is always voluntary
D. Muscle contraction results in the shortening of muscle fibers
C. Muscle contraction can be both voluntary (controlled by conscious thought) and involuntary (occurring automatically).
Question 44: The ability of muscles to shorten and generate force is due to:
A. The presence of specialized proteins
B. The release of hormones
C. The flow of blood
D. The presence of nerve cells
A. The unique arrangement and interaction of proteins within muscle fibers enable them to contract.
Question 45: Which of the following is NOT a characteristic of skeletal muscle?
A. Striated appearance
B. Voluntary control
C. Found in the walls of internal organs
D. Attached to bones
C. Smooth muscles, not skeletal muscles, are found in the walls of internal organs.
Question 46: The primary function of muscle tissue is to:
A. Produce hormones
B. Transmit nerve impulses
C. Generate movement
D. Store energy
C. Muscle tissue is specialized for contraction, which leads to various types of movement in the body.
Question 47: Do plants have a nervous system or muscles?
A. Yes, they have both
B. No, they have neither
C. They have a nervous system but no muscles
D. They have muscles but no nervous system
B. Plants lack the specialized nervous and muscular systems found in animals.
Question 48: How do plants respond to stimuli?
A. Through electrical impulses
B. Through hormonal signals and growth movements
C. Through conscious thought
D. They do not respond to stimuli
B. Plants utilize chemical signals (hormones) and changes in growth patterns to respond to their environment.
Question 49: Which of the following is an example of a growth-dependent movement in plants?
A. The folding of leaves in a sensitive plant
B. The bending of a shoot towards light
C. The opening and closing of flowers
D. The movement of pollen grains
B. The bending of a shoot towards light is a result of differential growth in response to the stimulus.
Question 50: Which of the following is an example of a growth-independent movement in plants?
A. The twining of a tendril around a support
B. The closing of leaves in a Venus flytrap
C. The wilting of leaves
D. The growth of roots downwards
B. The rapid closure of leaves in a Venus flytrap is a growth-independent movement triggered by touch.
Question 51: Which plant is known for its rapid leaf folding in response to touch?
A. Sunflower
B. Mimosa pudica (sensitive plant)
C. Venus flytrap
D. Pitcher plant
B. Mimosa pudica exhibits a quick drooping of leaves when touched, a thigmonastic movement.
Question 52: How does a sensitive plant transmit information about touch?
A. Through electrical signals
B. Through chemical signals
C. Through a combination of electrical and chemical signals
D. Through changes in water pressure
C. The sensitive plant uses a combination of electrical and chemical signals to transmit information about touch.
Question 53: What causes the movement of leaves in a sensitive plant?
A. Changes in the concentration of hormones
B. Changes in the amount of water in specific cells
C. Contraction of muscle-like fibers
D. Growth of new cells
B. Changes in water content within certain cells lead to swelling or shrinking, causing the leaves to move.
Question 54: The rapid movement of leaves in a sensitive plant is an example of:
A. Tropism
B. Nastic movement
C. Growth movement
D. Turgor movement
B. Nastic movements are non-directional responses to stimuli, like the folding of leaves in Mimosa pudica.
Question 55: Which of the following statements about the mechanism of information transfer in plants is TRUE?
A. It is identical to the nervous system in animals
B. It involves specialized tissues for conduction
C. It relies solely on electrical signals
D. It can involve both electrical and chemical signals
D. Plants utilize a combination of electrical and chemical signals for communication, although they lack specialized nerve tissues.
Question 56: What enables a pea plant’s tendrils to coil around a support?
A. Rapid growth on the side touching the support
B. Slower growth on the side touching the support
C. Equal growth on both sides of the tendril
D. The presence of specialized muscles in the tendril
B. Tendrils exhibit differential growth, with the side not in contact with the support growing faster, causing the tendril to curl around the object.
Question 57: What is the term for directional growth movements in plants in response to stimuli?
A. Tropism
B. Nastic movement
C. Photoperiodism
D. Vernalization
A. Tropism refers to the growth of a plant in a particular direction in response to an external stimulus.
Question 58: The growth of a plant shoot towards light is an example of:
A. Phototropism
B. Geotropism
C. Hydrotropism
D. Chemotropism
A. Phototropism is the directional growth of a plant in response to light.
Question 59: The growth of roots downwards into the soil is an example of:
A. Phototropism
B. Geotropism
C. Hydrotropism
D. Chemotropism
B. Geotropism is the growth of a plant in response to gravity, with roots typically showing positive geotropism (growing downwards) and shoots showing negative geotropism (growing upwards).
Question 60: The growth of roots towards a water source is an example of:
A. Phototropism
B. Geotropism
C. Hydrotropism
D. Chemotropism
C. Hydrotropism is the directional growth of plant roots in response to a moisture gradient.
Question 61: The growth of a pollen tube towards the ovule is an example of:
A. Phototropism
B. Geotropism
C. Hydrotropism
D. Chemotropism
D. Chemotropism is the growth of a plant in response to a chemical stimulus, such as the growth of a pollen tube towards the ovule due to chemical attractants.
Question 62: Which of the following statements about tropism is FALSE?
A. It is a directional growth movement
B. It can be either towards or away from the stimulus
C. It is independent of growth
D. It helps plants adapt to their environment
C. Tropism is inherently dependent on growth, as it involves the plant growing in a specific direction.
Question 63: The differential growth observed in tendrils and shoots bending towards light is primarily due to:
A. Unequal distribution of water
B. Unequal distribution of hormones
C. Unequal distribution of nutrients
D. Unequal distribution of sunlight
B. Plant hormones, like auxin, play a crucial role in regulating differential growth, leading to the bending or coiling movements observed in plants.
Question 64: Which of the following is NOT a type of tropism?
A. Thigmotropism (response to touch)
B. Thermotropism (response to temperature)
C. Heliotropism (response to the sun’s movement)
D. Photoperiodism (response to day length)
D. Photoperiodism is a physiological response to the relative lengths of day and night, influencing processes like flowering, but it is not a type of tropism.
Question 65: What are plant hormones?
A. Chemical signals that coordinate plant growth and development
B. Electrical impulses that transmit information in plants
C. Nutrients that provide energy for plant growth
D. Enzymes that catalyze reactions in plants
A. Plant hormones are chemical messengers that regulate various aspects of plant growth, development, and responses to the environment.
Question 66: Which plant hormone is responsible for cell elongation and plays a role in phototropism?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
A. Auxin promotes cell elongation and is involved in the bending of shoots towards light.
Question 67: Which plant hormone stimulates stem growth?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
B. Gibberellins are growth-promoting hormones that stimulate stem elongation and other developmental processes.
Question 68: Which plant hormone promotes cell division?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
C. Cytokinins are essential for cell division and differentiation in plants.
Question 69: Which plant hormone inhibits growth and is involved in processes like leaf wilting?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
D. Abscisic acid acts as a growth inhibitor and plays a role in stress responses like dormancy and stomatal closure.
Question 70: Which of the following statements about plant hormones is FALSE?
A. They are produced in specific parts of the plant
B. They act on target cells away from their site of production
C. They are transported through the plant’s vascular system
D. They are always growth-promoting
D. Plant hormones can have diverse effects, including promoting growth, inhibiting growth, or regulating other physiological processes.
Question 71: The bending of a plant shoot towards light is caused by:
A. The accumulation of auxin on the shaded side of the shoot
B. The accumulation of auxin on the illuminated side of the shoot
C. The destruction of auxin on the shaded side of the shoot
D. The destruction of auxin on the illuminated side of the shoot
A. Auxin accumulates on the shaded side, causing those cells to elongate faster and resulting in the shoot bending towards the light.
Question 72: Which hormone is responsible for the ripening of fruits?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Ethylene
D. Ethylene is a gaseous hormone that promotes fruit ripening and other senescence processes.
Question 73: Which hormone helps plants cope with stress conditions like drought?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
D. Abscisic acid is involved in stress responses, triggering stomatal closure to reduce water loss and promoting seed dormancy.
Question 74: The process of seed germination is promoted by:
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
B. Gibberellins break seed dormancy and stimulate germination by promoting embryo growth and the mobilization of stored nutrients.
Question 75: How do animals achieve chemical coordination?
A. Through the nervous system
B. Through the endocrine system
C. Through both the nervous and endocrine systems
D. Through muscle contractions
B. The endocrine system, comprising various glands that secrete hormones, is responsible for chemical coordination in animals.
Question 76: What are hormones?
A. Electrical signals that travel through nerves
B. Chemical messengers that travel through the bloodstream
C. Enzymes that catalyze reactions in the body
D. Nutrients that provide energy
B. Hormones are chemical signals produced by endocrine glands, transported via the blood to target organs where they exert specific effects.
Question 77: Which system in animals is responsible for producing and secreting hormones?
A. Nervous system
B. Endocrine system
C. Circulatory system
D. Respiratory system
B. The endocrine system is a network of glands that secrete hormones directly into the bloodstream.
Question 78: What is the main function of the endocrine system?
A. To control and coordinate bodily functions
B. To transmit nerve impulses
C. To produce blood cells
D. To filter waste products
A. The endocrine system regulates various physiological processes like growth, metabolism, and reproduction through hormonal signals.
Question 79: Which of the following statements about hormones is FALSE?
A. They are produced by endocrine glands
B. They travel through the bloodstream
C. They act on specific target organs
D. They are always proteins
D. Hormones can be of various chemical natures, including proteins, steroids, and amines.
Question 80: Which gland secretes adrenaline?
A. Pituitary gland
B. Thyroid gland
C. Adrenal gland
D. Pancreas
C. Adrenaline is secreted by the adrenal glands, located on top of the kidneys.
Question 81: What is the primary role of adrenaline in the body?
A. Regulates growth and development
B. Controls blood sugar levels
C. Prepares the body for a fight-or-flight response
D. Stimulates metabolism
C. Adrenaline triggers physiological changes that help the body respond to stressful or threatening situations.
Question 82: Which of the following is NOT an effect of adrenaline?
A. Increased heart rate
B. Dilated pupils
C. Decreased breathing rate
D. Increased blood flow to muscles
C. Adrenaline increases the breathing rate to supply more oxygen to the body.
Question 83: Adrenaline is released in response to:
A. Stress or fear
B. Relaxation
C. Sleep
D. Digestion
A. The body releases adrenaline when it perceives a threat or challenge, preparing it to either fight or flee.
Question 84: The “fight-or-flight” response is associated with which hormone?
A. Insulin
B. Thyroxine
C. Adrenaline
D. Growth hormone
C. Adrenaline is the key hormone that mediates the physiological changes during the fight-or-flight response.
Question 85: Which of the following organs is NOT a target organ of adrenaline?
A. Heart
B. Lungs
C. Blood vessels
D. Pancreas
D. While adrenaline affects various organs, the pancreas is not a primary target organ.
Question 86: Which hormone regulates metabolism in the body?
A. Thyroxine
B. Insulin
C. Growth hormone
D. Adrenaline
A. Thyroxine, produced by the thyroid gland, controls the rate of metabolism, affecting energy expenditure and growth.
Question 87: Which hormone is responsible for regulating growth and development?
A. Thyroxine
B. Insulin
C. Growth hormone
D. Adrenaline
C. Growth hormone, secreted by the pituitary gland, stimulates growth and development of various tissues and organs.
Question 88: Which hormones are associated with puberty in males and females, respectively?
A. Testosterone and estrogen
B. Insulin and glucagon
C. Thyroxine and adrenaline
D. Growth hormone and cortisol
A. Testosterone is the primary male sex hormone, while estrogen is the primary female sex hormone, both playing key roles in pubertal development.
Question 89: Which hormone regulates blood sugar levels?
A. Thyroxine
B. Insulin
C. Growth hormone
D. Adrenaline
B. Insulin, produced by the pancreas, helps regulate blood glucose levels by promoting glucose uptake by cells.
Question 90: Which gland is responsible for producing insulin?
A. Pituitary gland
B. Thyroid gland
C. Adrenal gland
D. Pancreas
D. The pancreas houses clusters of cells called islets of Langerhans, which produce hormones like insulin and glucagon.
Question 91: What is the condition called when the body doesn’t produce enough insulin or doesn’t respond to it properly?
A. Goiter
B. Dwarfism
C. Gigantism
D. Diabetes
D. Diabetes is a metabolic disorder characterized by high blood sugar levels due to insufficient insulin production or action.
Question 92: Which hormone is responsible for the “fight-or-flight” response?
A. Adrenaline
B. Thyroxine
C. Insulin
D. Growth hormone
A. Adrenaline triggers the physiological changes associated with the fight-or-flight response, preparing the body to deal with a perceived threat.
Question 93: Which hormone is essential for the development of male secondary sexual characteristics?
A. Estrogen
B. Testosterone
C. Insulin
D. Thyroxine
B. Testosterone promotes the development of male secondary sexual characteristics like facial hair, deepening of the voice, and muscle growth.
Question 94: A deficiency of growth hormone during childhood can lead to:
A. Dwarfism
B. Gigantism
C. Diabetes
D. Goiter
A. Insufficient growth hormone production during childhood results in stunted growth, leading to dwarfism.
Question 95: An excess of growth hormone during childhood can lead to:
A. Dwarfism
B. Gigantism
C. Diabetes
D. Goiter
B. Excessive growth hormone production during childhood causes abnormal growth, leading to gigantism.
Question 96: Which of the following hormones is NOT produced by the pituitary gland?
A. Growth hormone
B. Thyroxine
C. Follicle-stimulating hormone (FSH)
D. Luteinizing hormone (LH)
B. Thyroxine is produced by the thyroid gland, not the pituitary gland.
Question 97: What is the purpose of feedback mechanisms in hormone regulation?
A. To maintain a constant level of hormones in the blood
B. To control the timing and amount of hormone release
C. To stimulate the production of more hormones
D. To inhibit the production of hormones
B. Feedback mechanisms ensure that hormones are released in appropriate amounts and at the right times to maintain homeostasis.
Question 98: Which of the following is an example of a negative feedback mechanism in hormone regulation?
A. The release of oxytocin during childbirth
B. The release of adrenaline during a stressful situation
C. The regulation of blood sugar levels by insulin and glucagon
D. The release of growth hormone during puberty
C. When blood sugar rises, insulin is released to lower it; when blood sugar falls, glucagon is released to raise it. This is a classic example of negative feedback.
Question 99: How does the body regulate the release of insulin?
A. Based on blood sugar levels
B. Based on stress levels
C. Based on the time of day
D. Based on body temperature
A. The pancreas monitors blood glucose levels and adjusts insulin secretion accordingly.
Question 100: Which of the following statements about feedback mechanisms is TRUE?
A. They always involve positive feedback
B. They are essential for maintaining homeostasis
C. They only regulate hormone levels, not other bodily functions
D. They are not influenced by external factors
B. Feedback mechanisms are crucial for maintaining a stable internal environment (homeostasis) by regulating various physiological processes, including hormone levels.
