CBSE Class 10 Biology Control and Coordination MCQs Set 08

Practice MCQs for Class 10 Science Chapter 06 Control and Coordination

Review structured MCQ sets for Class 10 Science Chapter 06 Control and Coordination. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Access Chapter 06 Control and Coordination Questions and Solutions

Access the complete set of multiple-choice questions for Chapter 06 Control and Coordination below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

This page has 37 Class 10 Science MCQs on Control and Coordination, including assertion-reason questions, with answers and worked explanations. Questions cover receptors and sense organs, the spinal cord and cerebellum, the pancreas and thyroid, feedback control of hormones, and how plants respond to light, gravity, touch and water.

Multiple Choice Questions

Question 1: Select the mismatched pair
(a) Adrenaline : Pituitary gland
(b) Testosterone : Testes
(c) Estrogen : Ovary
(d) Thyroxin : Thyroid gland
Show Answer & Explanation

Answer: (a) Adrenaline : Pituitary gland

Explanation:
1. Adrenaline is secreted by the adrenal glands, not by the pituitary gland.
2. The other three pairs are correctly matched.

Teacher's Note:
1. Adrenal glands sit on top of the kidneys.
2. Learn each hormone with its gland as a pair.

Question 2: Rajesh noticed that a potted plant kept in the window of his room shows bending towards sunlight. This could be due to:
(a) More growth in the well lit region due to diffusion of auxin hormone.
(b) More growth in the region away from light due to diffusion of auxin hormone.
(c) More growth in the well lit region due to diffusion of cytokinin hormone.
(d) More growth in the region away from light due to diffusion of cytokinin hormone.
Show Answer & Explanation

Answer: (b) More growth in the region away from light due to diffusion of auxin hormone.

Explanation:
1. Auxin diffuses to the shady side of the shoot.
2. Cells on the shady side grow longer, so the shoot bends towards light.

Teacher's Note:
1. Auxin moves away from light.
2. The side with more auxin grows faster.

Question 3: Fruit and leaf drop at early stages can be prevented by the application of:
(a) Ethylene
(b) Auxins
(c) Gibberellic acid
(d) Cytokinins
Show Answer & Explanation

Answer: (b) Auxins

Explanation:
1. Auxins prevent early dropping of leaves and fruits.

Teacher's Note:
1. Abscisic acid and ethylene cause leaf fall.
2. Auxin delays it.

Question 4: Which of the following is a plant hormone?
(a) Insulin
(b) Thyroxine
(c) Oestrogen
(d) Cytokinin
Show Answer & Explanation

Answer: (d) Cytokinin

Explanation:
1. Insulin, thyroxine and oestrogen are animal hormones.
2. Cytokinin is a plant hormone that promotes cell division.

Teacher's Note:
1. Plant hormones: auxin, gibberellin, cytokinin, abscisic acid and ethylene.
2. Animal hormones are made by endocrine glands.

Question 5: Which of the following activity is controlled by medulla oblongata?
(a) Maintain balance of the body
(b) Peristaltic movement of alimentary canal
(c) Controlling body temperature
(d) Facial expression
Show Answer & Explanation

Answer: (b) Peristaltic movement of alimentary canal

Explanation:
1. The medulla controls involuntary activities such as peristalsis, heartbeat and breathing.
2. Balance is controlled by the cerebellum, and facial expression by the cerebrum.

Teacher's Note:
1. Medulla = involuntary activities.
2. Peristalsis occurs without our will.

Question 6: The main effect of cytokinin in plants is to
(a) improve the quality of fruits
(b) prevent the growth of lateral buds
(c) regulate opening and closing of stomata
(d) stimulate cell division
Show Answer & Explanation

Answer: (d) stimulate cell division

Explanation:
1. Cytokinins promote cell division.

Teacher's Note:
1. Cytokinins are abundant in fruits and seeds.
2. Abscisic acid closes stomata.

Question 7: Walking in a straight line and riding a bicycle are the activities which are possible due to a part of the brain. Choose the correct location and name of this part from the given table:
(a) Part of the brain: Fore brain; Name: Cerebrum
(b) Part of the brain: Mid brain; Name: Hypothalamus
(c) Part of the brain: Hind brain; Name: Cerebellum
(d) Part of the brain: Hind brain; Name: Medulla
Show Answer & Explanation

Answer: (c) Part of the brain: Hind brain; Name: Cerebellum

Explanation:
1. Walking in a straight line and riding a bicycle need balance and precision of voluntary movements.
2. These are controlled by the cerebellum, which is a part of the hind brain.
3. The medulla controls involuntary actions such as vomiting and blood pressure, so (c) is correct.

Teacher's Note:
1. The cerebellum is the balance centre of the brain.
2. Link every activity that needs balance and posture to the cerebellum.

Question 8: Which of the following signal will get disrupted in case of a spinal cord injury?
(a) Involuntary actions
(b) Reflex actions
(c) Both (a) and (b)
(d) None of them
Show Answer & Explanation

Answer: (c) Both (a) and (b)

Explanation:
1. The spinal cord carries messages between the body and the brain and controls reflex actions.
2. An injury disrupts reflex and involuntary actions.

Teacher's Note:
1. The spinal cord is the control centre of reflexes.
2. It also carries signals of voluntary movement.

Question 9: The substance that triggers the fall of mature leaves and fruits from plants is due to
(a) auxins
(b) gibberellin
(c) abscisic acid
(d) cytokinin
Show Answer & Explanation

Answer: (c) abscisic acid

Explanation:
1. Abscisic acid causes abscission, the fall of mature leaves and fruits.

Teacher's Note:
1. Abscisic acid is the stress hormone.
2. Growth promoters do not cause leaf fall.

Question 10: Which of the following is not an endocrine gland?
(a) Pancreas
(b) Liver
(c) Ovary
(d) Thyroid
Show Answer & Explanation

Answer: (b) Liver

Explanation:
1. Pancreas, ovary and thyroid secrete hormones directly into blood.
2. The liver secretes bile through a duct and is not an endocrine gland.

Teacher's Note:
1. Endocrine glands are ductless.
2. The liver is an exocrine gland.

Question 11: Which of the following cannot be considered as a receptor?
(a) Muscle
(b) Ear
(c) Eye
(d) Nose
Show Answer & Explanation

Answer: (a) Muscle

Explanation:
1. Ear, eye and nose are sense organs containing receptors.
2. A muscle is an effector, which responds to stimulus.

Teacher's Note:
1. Muscles and glands are effectors.
2. Receptors are in sense organs.

Question 12: Electrical impulse travels in a neuron from
(a) Dendrite → axon → axonal end → cell body
(b) Cell body → dendrite → axon → axonal end
(c) Dendrite → cell body → axon → axonal end
(d) Axonal end → axon → cell body → dendrite
Show Answer & Explanation

Answer: (c) Dendrite → cell body → axon → axonal end

Explanation:
1. A neuron acquires information at the tips of its dendrites.
2. The impulse then passes to the cell body, along the axon and reaches the axonal end.

Teacher's Note:
1. The impulse in a neuron is always one way.
2. Remember the order D-C-A-A: dendrite, cell body, axon, axonal end.

Question 13: A human hormone reducing blood flow to the digestive system and skin during stress is
(a) Thyroxin
(b) Adrenaline
(c) Growth hormone
(d) Insulin
Show Answer & Explanation

Answer: (b) Adrenaline

Explanation:
1. Adrenaline, the emergency hormone, diverts blood from the digestive system and skin to the muscles during stress.

Teacher's Note:
1. Adrenaline prepares the body for fight or flight.
2. It raises heartbeat and breathing rate.

Question 14: The role of the axon is to
(a) integrate signals from the dendrites.
(b) release neurotransmitter.
(c) conduct the action potential to the synaptic terminal.
(d) synthesise cellular components.
Show Answer & Explanation

Answer: (c) conduct the action potential to the synaptic terminal.

Explanation:
1. The axon is the long fibre of a neuron that carries the nerve impulse from the cell body to the axonal end (synaptic terminal).

Teacher's Note:
1. Dendrites receive, axons conduct.
2. The release of the chemical happens at the axonal end.

Question 15: Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
(a) Phototropism
(b) Thigmonasty
(c) Chemotropism
(d) Photonasty
Show Answer & Explanation

Answer: (d) Photonasty

Explanation:
1. The opening and closing is a non-directional response to light intensity, so it is a nastic movement caused by light, called photonasty.

Teacher's Note:
1. Nastic movements are not directed towards the stimulus.
2. Thigmonasty is a response to touch.

Question 16: Iodine is necessary for the synthesis of which hormone?
(a) Adrenaline
(b) Thyroxine
(c) Auxin
(d) Insulin
Show Answer & Explanation

Answer: (b) Thyroxine

Explanation:
1. Thyroid gland needs iodine to make thyroxine.
2. Lack of iodine causes goitre.

Teacher's Note:
1. This is why iodised salt is recommended.
2. Thyroxine regulates carbohydrate, protein and fat metabolism.

Question 17: Which among them is a reflex action?
(a) Sensory neuron – Motor neuron – Relay neuron
(b) Motor neuron – relay – Motor neuron
(c) Sensory – relay – motor neuron
(d) Relay – Motor – Sensory
Show Answer & Explanation

Answer: (c) Sensory – relay – motor neuron

Explanation:
1. In a simple reflex the impulse goes from the sensory neuron to a relay neuron and then to the motor neuron.

Teacher's Note:
1. The relay neuron lies in the spinal cord.
2. The order is always sensory, relay, motor.

Question 18: Which statement is not true about thyroxine?
(a) Thyroxine regulates the basal metabolism of our body.
(b) Iodine is an important component required for synthesis of thyroxine.
(c) Under secretion of thyroxine causes simple goitre.
(d) Iron is essential for synthesis of thyroxine.
Show Answer & Explanation

Answer: (d) Iron is essential for synthesis of thyroxine.

Explanation:
1. Iodine, and not iron, is needed for the synthesis of thyroxine.
2. The other statements are true.

Teacher's Note:
1. Iodine deficiency causes simple goitre.
2. Iodised salt provides the iodine needed.

Question 19: Our hind brain has these three parts:
(a) pons, medulla, and cerebellum
(b) mid-brain, medulla, and cerebellum
(c) spinal cord, cerebellum, and medulla oblongata
(d) hypothalamus, cerebrum, and cerebellum
Show Answer & Explanation

Answer: (a) pons, medulla, and cerebellum

Explanation:
1. The hind brain consists of the pons, the medulla and the cerebellum.

Teacher's Note:
1. Fore brain: cerebrum, hypothalamus, thalamus.
2. Hind brain: pons, medulla, cerebellum.

Question 20: Chemicals which are released at the synaptic junction are called
(a) cerebrospinal fluid
(b) hormones
(c) neurotransmitters
(d) lymph
Show Answer & Explanation

Answer: (c) neurotransmitters

Explanation:
1. The chemicals released by the axonal end into the synapse are called neurotransmitters.

Teacher's Note:
1. They carry the signal across the gap.
2. Hormones travel in blood.

Question 21: Which of the following receptors is incorrectly paired with what it senses?
(a) Chemoreceptors – chemicals
(b) Photoreceptors – pain
(c) Thermoreceptors – heat
(d) Nociceptors – pain
Show Answer & Explanation

Answer: (b) Photoreceptors – pain

Explanation:
1. Photoreceptors detect light, not pain.

Teacher's Note:
1. Photo means light.
2. Pain is sensed by nociceptors.

Question 22: Deficiency of which hormone leads to dwarfism?
(a) Adrenaline
(b) Thyroxine
(c) Growth Hormone
(d) Somatostatin
Show Answer & Explanation

Answer: (c) Growth Hormone

Explanation:
1. Lack of growth hormone from the pituitary in childhood causes dwarfism.

Teacher's Note:
1. Excess growth hormone causes gigantism.
2. Growth hormone is secreted by the pituitary.

Question 23: Intercellular communication in multicellular organisms occur through
(a) digestive system only
(b) nervous system only
(c) both nervous and endocrine system
(d) respiratory system only
Show Answer & Explanation

Answer: (c) both nervous and endocrine system

Explanation:
1. Cells of a multicellular organism communicate by electrical impulses (nervous system) and hormones (endocrine system).

Teacher's Note:
1. Both systems are needed.
2. Nervous communication is fast; hormonal is slow.

Question 24: Which of the following is not a reflex action?
(a) Knee jerk
(b) Boxing
(c) Coughing
(d) Eye lid closing
Show Answer & Explanation

Answer: (b) Boxing

Explanation:
1. Knee jerk, coughing and closing of eyelid are automatic, quick responses.
2. Boxing is a voluntary, planned action.

Teacher's Note:
1. A reflex is automatic and fast.
2. Planned actions need the brain.

Question 25: An injury in accident has disturbed regulation of body temperature, water balance and hunger. The part of brain affected is:
(a) Cerebellum
(b) Cerebrum
(c) Medulla oblongata
(d) Hypothalamus
Show Answer & Explanation

Answer: (d) Hypothalamus

Explanation:
1. The hypothalamus controls body temperature, water balance and hunger.
2. So its injury would disturb these.

Teacher's Note:
1. The hypothalamus is part of the forebrain.
2. It links the nervous system with the endocrine system.

Question 26: Which part of the brain is affected first in a drunk person?
(a) Cerebrum
(b) Medulla oblongata
(c) Cerebellum
(d) Olfactory lobe
Show Answer & Explanation

Answer: (c) Cerebellum

Explanation:
1. Alcohol affects the cerebellum, which controls balance and posture, so a drunk person walks clumsily.

Teacher's Note:
1. Cerebellum = balance.
2. A drunk person cannot walk in a straight line.

Question 27: Coordination via nervous system tends to differ from that produced by the endocrine system because the nervous system
(a) is quick, precise, and localized.
(b) is slower and more pervasive.
(c) does not require conscious activity.
(d) has long-lasting effects.
Show Answer & Explanation

Answer: (a) is quick, precise, and localized.

Explanation:
1. Nerve impulses travel fast and reach specific, exact targets.
2. Hormones act more slowly, spread through blood and last longer.

Teacher's Note:
1. Nervous: fast, short-lived, specific.
2. Endocrine: slow, long-lasting, widespread.

Question 28: Which one is not secreted by pituitary?
(a) Thyroxine
(b) FSH
(c) GH
(d) ACTH
Show Answer & Explanation

Answer: (a) Thyroxine

Explanation:
1. FSH, GH and ACTH are pituitary hormones.
2. Thyroxine is secreted by the thyroid gland.

Teacher's Note:
1. The pituitary controls the thyroid by TSH, but thyroxine itself is from the thyroid.
2. Know the gland of each hormone.

Question 29: Given below are four statements regarding movement in plants.
(I) Movement in plants happens at a point of touch.
(II) The plants use electrical-chemical means to convey information from cell to cell.
(III) There are specialised tissues in plants for the conduction of information.
(IV) Plant cells change shape by changing the amount of water in them.
Select the INCORRECT statements:
(a) Both (I) and (III)
(b) Both (I) and (IV)
(c) Both (II) and (III)
(d) Both (II) and (IV)
Show Answer & Explanation

Answer: (a) Both (I) and (III)

Explanation:
1. Plants have no specialised tissues for conducting information, so (III) is incorrect.
2. Movement in plants does not happen only at the point of touch; the information is passed on from cell to cell, so (I) is also incorrect.

Teacher's Note:
1. Plant cells change shape by taking in or losing water.
2. Plants have no nerves.

Question 30: Phototropic and geotropic movements in plants have been traced to be linked with:
(a) Enzymes
(b) Starch
(c) Gibberellin
(d) Auxin
Show Answer & Explanation

Answer: (d) Auxin

Explanation:
1. Both phototropism and geotropism result from unequal distribution of auxin on the two sides of the shoot or root.

Teacher's Note:
1. Auxin makes cells elongate.
2. Its distribution changes with light and gravity.

Question 31: Select from the following the correct statement about tropic movement in plants.
(a) It is due to stimulus of touch and temperature.
(b) It does not depend upon the direction of stimulus received.
(c) It is observed only in roots and not in stem.
(d) It is a growth related movement.
Show Answer & Explanation

Answer: (d) It is a growth related movement.

Explanation:
1. Tropic movements are directional, depend on the direction of the stimulus and are growth related.
2. They occur in both roots and shoots.

Teacher's Note:
1. Nastic movements are not growth related.
2. Tropisms include photo-, geo-, hydro-, chemo- and thigmotropism.

Question 32: Sapna suffers from a condition due to which her average blood sugar level is 174 mg/dL. The average blood sugar level in a healthy adult is < 140 mg/dL. Which of the following could be the cause of Sapna's condition?
(a) Insufficient production of thyroxine in her body.
(b) Insufficient production of insulin in her body.
(c) Excess production of thyroxine in her body.
(d) Excess production of insulin in her body.
Show Answer & Explanation

Answer: (b) Insufficient production of insulin in her body.

Explanation:
1. Her blood sugar is higher than normal, which is a sign of diabetes.
2. Diabetes is caused by insufficient production of insulin, since insulin lowers blood sugar.

Teacher's Note:
1. Insulin lowers blood glucose; its shortage raises it.
2. Thyroxine controls metabolism, not blood sugar.

Question 33: Which option illustrates the location of the centre that controls the feelings associated with hunger (M) and the centre that allows a person to walk in a straight line (N)?
(a) (M) Hind brain; (N) Forebrain
(b) (M) Forebrain; (N) Forebrain
(c) (M) Forebrain; (N) Hind brain
(d) (M) Hind brain; (N) Hind brain
Show Answer & Explanation

Answer: (c) (M) Forebrain; (N) Hind brain

Explanation:
1. The centre for hunger lies in the hypothalamus of the forebrain.
2. Walking in a straight line is controlled by the cerebellum of the hind brain.

Teacher's Note:
1. Forebrain: thinking, hunger and other sensations.
2. Hind brain: balance, posture and involuntary actions.

Question 34:
Assertion (A): Males have more stature than females during puberty.
Reason (R): This is because of presence of thyroxin in the blood of females.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (c) A is true, but R is false.

Explanation:
1. Males grow taller owing to testosterone, so A is true.
2. Thyroxine is present in both sexes and does not make females shorter, so R is false.

Teacher's Note:
1. Testosterone is the male sex hormone made in the testes.
2. Thyroxine regulates metabolism.

Question 35:
Assertion (A): In animals, the brain is the main controlling centre for responding to changes in their environment.
Reason (R): The thinking process of the brain is not fast enough in animals.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (c) A is true, but R is false.

Explanation:
1. The brain is the main controlling centre, so A is true.
2. The thinking process of the brain is fast and not slow, so R is false.

Teacher's Note:
1. Reflex arcs exist for even faster responses.
2. Read each statement separately.

Question 36:
Assertion (A): Units which make up the nervous system are called neurons.
Reason (R): Nerve impulses are carried by dendrites towards the cell body.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Explanation:
1. The nervous system is made up of neurons, so A is true.
2. Dendrites carry impulses towards the cell body, so R is true, but it does not explain why neurons are the units of the nervous system.

Teacher's Note:
1. Two true statements need not be related as cause and effect.
2. Check whether R really explains A.

Question 37:
Assertion (A): Diabetes mellitus is caused due to lack of insulin in the body.
Reason (R): Insulin helps in utilisation of glucose in the body.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Insulin helps cells to use glucose and lowers blood sugar.
2. Its lack leaves glucose high in blood, causing diabetes.

Teacher's Note:
1. Insulin comes from the beta cells of the pancreas.
2. Diabetes patients take insulin injections.

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