CBSE Class 10 Science MCQs Chapter 6 Control and Coordination

1. Which of the following movements are not caused by growth in living organisms?

(A) Germination of plants

(B) Chewing of cud by buffaloes

(D) A cat running

Answer

Answer: (B) Chewing of cud by buffaloes

2. Why do we associate movement with life?

(A) To obtain food

(B) To enjoy

(D) For protection

Answer

Answer: (C) As a response to changes in the environment

3. Why do plants grow towards sunlight?

(A) To search for water

(B) To obtain nutrients

(D) As a response to environmental changes

Answer

Answer: (D) As a response to environmental changes

4. How is control and coordination achieved in living organisms?

(A) Through organs

(B) Through specialized tissues

(D) Through the changing environment

Answer

Answer: (B) Through specialized tissues

5. What is our typical response when we touch a hot object?

(A) Stay still

(B) Feel cold

(D) Show no response

Answer

Answer: (C) Pull away from it

6. Which two types of tissues provide control and coordination in animals?

(A) Nervous and connective tissues

(B) Muscular and connective tissues

(D) Epithelial and muscular tissues

Answer

Answer: (C) Nervous and muscular tissues

7. Where are receptors that detect environmental information usually located?

(A) In the skin

(B) In sense organs

(D) In bones

Answer

Answer: (B) In sense organs

8. What type of receptors detect taste?

(A) Olfactory receptors

(B) Visual receptors

(D) Auditory receptors

Answer

Answer: (C) Gustatory receptors

9. What happens after the chemical reaction is triggered at the dendritic tip of a nerve cell?

(A) The body cools down

(B) An electrical impulse is generated

(D) The receptor stops working

Answer

Answer: (B) An electrical impulse is generated

10. Which of the following is the correct sequence of how a nervous impulse travels?

(A) Axon → Dendrite → Cell body

(B) Dendrite → Axon → Cell body

(D) Cell body → Dendrite → Axon

Answer

Answer: (C) Dendrite → Cell body → Axon

11. What is the synapse?

(A) The place where nerve cells are located

(B) A gap between neurons where chemicals are released

(D) The main part of the brain

Answer

Answer: (B) A gap between neurons where chemicals are released

12. How do nervous impulses move from one neuron to the next?

(A) By jumping across neurons

(B) By electrical impulses directly connecting neurons

(D) By the release of heat energy

Answer

Answer: (C) By chemical signals crossing the synapse

13. Which part of a neuron acquires information?

(A) Axon

(B) Dendrite

(D) Cell body

Answer

Answer: (B) Dendrite

14. Where is the electrical impulse converted into a chemical signal?

(A) At the dendrite

(B) At the cell body

(D) At the synapse

Answer

Answer: (D) At the synapse

15. What is the main function of nervous tissue?

(A) To protect the body

(B) To conduct information through electrical impulses

(D) To produce energy

Answer

Answer: (B) To conduct information through electrical impulses

16. In Activity 6.1, what is the first step?

(A) Block your nose and taste sugar

(B) Put some sugar in your mouth

(D) Taste sugar without blocking your nose

Answer

Answer: (B) Put some sugar in your mouth

17. What happens when you block your nose and then taste sugar?

(A) It tastes sweeter

(B) There is no taste

(D) The taste remains the same

Answer

Answer: (C) The taste changes

18. How can you block your nose during Activity 6.1?

(A) By holding your breath

(B) By using a cloth

(D) By using your palm

Answer

Answer: (C) By pressing it between your thumb and index finger

19. When you block your nose while eating lunch, what do you notice?

(A) You cannot fully appreciate the taste of the food

(B) The food tastes sweeter

(D) The food tastes bitter

Answer

Answer: (A) You cannot fully appreciate the taste of the food

20. Why might the taste of sugar and food be different when your nose is blocked?

(A) Because the sugar melts faster

(B) Because taste is influenced by smell

(D) Because the food is spicier

Answer

Answer: (B) Because taste is influenced by smell

21. What common situation makes you experience a similar change in taste as when your nose is blocked?

(A) When you are hungry

(B) When you are cold

(D) When you are tired

Answer

Answer: (C) When you have a cold

22. Which sense is primarily affected when you block your nose while eating?

(A) Taste

(B) Smell

(D) Sight

Answer

Answer: (B) Smell

23. What is the purpose of Activity 6.1?

(A) To understand how the nose influences taste

(B) To detect the sweetness of sugar

(D) To change the taste of food

Answer

Answer: (A) To understand how the nose influences taste

24. Which of the following can be inferred from the activity?

(A) Taste and smell are independent of each other

(B) Smell enhances the sense of taste

(D) Blocking the nose improves taste

Answer

Answer: (B) Smell enhances the sense of taste

25. When do people most commonly experience changes in taste due to blocked nasal passages?

(A) When they have allergies

(B) When they have a cold

(D) When they are sleepy

Answer

Answer: (B) When they have a cold

26. What does the term ‘reflex’ commonly refer to?

(A) A sudden action in response to an environmental stimulus

(B) A slow response to pain

(D) A reaction that takes a long time to process

Answer

Answer: (A) A sudden action in response to an environmental stimulus

27. Which of the following is an example of a reflex action?

(A) Thinking about pain before reacting

(B) Pulling your hand back from a flame without thinking

(D) Consciously deciding to move your hand

Answer

Answer: (B) Pulling your hand back from a flame without thinking

28. Why is reflex action beneficial in urgent situations like touching a hot object?

(A) It gives us time to think before reacting

(B) It allows the brain to process the situation quickly

(D) It helps the body detect pain more efficiently

Answer

Answer: (C) It bypasses thinking and quickly responds to danger

29. What is the thinking tissue in our body made of?

(A) Muscles

(B) Neurons

(D) Bones

Answer

Answer: (B) Neurons

30. Where is the thinking part of the brain located?

(A) In the spinal cord

(B) At the back of the skull

(D) In the chest

Answer

Answer: (C) In the forward end of the skull

31. What is a ‘reflex arc’?

(A) A conscious reaction to pain

(B) A connection between input and output nerves for quick response

(D) A slow movement of muscles in response to stimuli

Answer

Answer: (B) A connection between input and output nerves for quick response

32. Where do nerves from different parts of the body meet before reaching the brain?

(A) In the heart

(B) In the spinal cord

(D) In the eyes

Answer

Answer: (B) In the spinal cord

33. Why have reflex arcs evolved in animals?

(A) Because the thinking process of the brain is slow

(B) Because animals cannot sense pain

(D) To make movement slower

Answer

Answer: (A) Because the thinking process of the brain is slow

34. Which of the following statements is true about reflex arcs in animals?

(A) Reflex arcs are only present in complex animals

(B) Reflex arcs evolved before complex neuron networks

(D) Reflex arcs only function after thought processes

Answer

Answer: (B) Reflex arcs evolved before complex neuron networks

35. What is the advantage of reflex arcs even after the development of complex neuron networks?

(A) They allow for slower, deliberate responses

(B) They are more efficient for quick responses

(D) They prevent the brain from receiving signals

Answer

Answer: (B) They are more efficient for quick responses

36. What is the main coordinating center of the body?

(A) Spinal cord

(B) Heart

(D) Lungs

Answer

Answer: (C) Brain

37. What constitutes the central nervous system in humans?

(A) Brain and spinal cord

(B) Heart and brain

(D) Brain and nerves

Answer

Answer: (A) Brain and spinal cord

38. Which part of the brain is responsible for thinking and decision-making?

(A) Mid-brain

(B) Hind-brain

(D) Fore-brain

Answer

Answer: (D) Fore-brain

39. What is the function of the fore-brain in the human brain?

(A) Controls balance and posture

(B) Controls involuntary actions

(D) Controls reflex actions

Answer

Answer: (C) Receives sensory impulses and controls voluntary actions

40. Which part of the brain controls involuntary actions like blood pressure and vomiting?

(A) Cerebellum

(B) Fore-brain

(D) Mid-brain

Answer

Answer: (C) Medulla in the hind-brain

41. What part of the brain is responsible for posture and balance?

(A) Fore-brain

(B) Cerebellum

(D) Mid-brain

Answer

Answer: (B) Cerebellum

42. The sensation of feeling full after eating is controlled by which part of the brain?

(A) Hind-brain

(B) Fore-brain

(D) Spinal cord

Answer

Answer: (B) Fore-brain

43. Which part of the brain is involved in controlling voluntary muscle movements?

(A) Hind-brain

(B) Mid-brain

(D) Cerebellum

Answer

Answer: (C) Fore-brain

44. What does the peripheral nervous system consist of?

(A) Spinal cord and brain

(B) Nerves arising from the brain and spinal cord

(D) Only spinal nerves

Answer

Answer: (B) Nerves arising from the brain and spinal cord

45. Which of the following actions is controlled by the cerebellum?

(A) Breathing

(B) Vomiting

(D) Heartbeat

Answer

Answer: (C) Walking in a straight line

46. How is the brain protected in the human body?

(A) By a layer of skin

(B) By a fluid-filled balloon inside a bony box

(D) By the spinal cord

Answer

Answer: (B) By a fluid-filled balloon inside a bony box

47. What structure protects the spinal cord in the human body?

(A) Rib cage

(B) Skull

(D) Pelvis

Answer

Answer: (C) Vertebral column

48. Why is the brain placed inside a fluid-filled balloon?

(A) To keep it cool

(B) To provide shock absorption

(D) To prevent infection

Answer

Answer: (B) To provide shock absorption

49. What is the hard, bumpy structure that you can feel when you run your hand down the middle of your back?

(A) Rib cage

(B) Spinal cord

(D) Nerves

Answer

Answer: (C) Vertebral column

50. Which of the following organs is protected by the vertebral column?

(A) Brain

(B) Heart

(D) Lungs

Answer

Answer: (C) Spinal cord

51. The brain is contained inside which protective structure?

(A) Muscle cage

(B) Bony box

(D) Vertebral column

Answer

Answer: (B) Bony box

52. What is the purpose of the fluid surrounding the brain inside the bony box?

(A) To nourish the brain

(B) To protect it from infection

(D) To support blood flow

Answer

Answer: (C) To provide shock absorption

53. What happens when a nerve impulse reaches a muscle?

(A) The muscle relaxes

(B) The muscle fibre contracts

(D) The muscle fibre lengthens

Answer

Answer: (B) The muscle fibre contracts

54. How do muscle cells move at the cellular level?

(A) By growing new fibres

(B) By shortening their shape

(D) By creating new proteins

Answer

Answer: (B) By shortening their shape

55. What special feature do muscle cells have that allows them to change their shape?

(A) Extra mitochondria

(B) Special proteins

(D) Chemical signals

Answer

Answer: (B) Special proteins

56. Which type of movement involves muscle cells shortening in response to electrical impulses?

(A) Chemical movement

(B) Reflex action

(D) Sensory movement

Answer

Answer: (C) Muscle contraction

57. Which of the following types of muscles were discussed in Class IX?

(A) Voluntary and involuntary muscles

(B) Reflex muscles and reaction muscles

(D) Cardiac and smooth muscles

Answer

Answer: (A) Voluntary and involuntary muscles

58. What causes the special proteins in muscle cells to rearrange and change their shape?

(A) Chemical reactions

(B) Electrical impulses from nerves

(D) Growth hormones

Answer

Answer: (B) Electrical impulses from nerves

59. What is the final action performed when nervous tissue sends signals to muscles?

(A) Muscles grow in size

(B) Muscles stop moving

(D) Muscles store energy

Answer

Answer: (C) Muscles contract and create movement

60. Which of the following statements is true about plants?

(A) They have a nervous system for coordination

(B) They have muscles for movement

(D) They respond to stimuli using a nervous system

Answer

Answer: (C) They do not have a nervous system or muscles

61. What happens when we touch the leaves of a ‘touch-me-not’ (Chhui-mui) plant?

(A) The leaves grow

(B) The leaves fold up and droop

(D) The plant dies

Answer

Answer: (B) The leaves fold up and droop

62. What type of movement does the ‘touch-me-not’ plant exhibit in response to touch?

(A) Growth-based movement

(B) Directional movement

(D) Stem movement

Answer

Answer: (C) Movement independent of growth

63. What causes the directional movement of a seedling?

(A) Wind

(B) Growth

(D) Light

Answer

Answer: (B) Growth

64. Which type of movement in plants is dependent on growth?

(A) Movement of leaves

(B) Movement of a seedling

(D) Movement of roots

Answer

Answer: (B) Movement of a seedling

65. What will happen if a seedling is prevented from growing?

(A) It will show faster movement

(B) It will continue to grow in a different direction

(D) It will turn into a tree

Answer

Answer: (C) It will not show any movement

66. Plants exhibit how many types of movements?

(A) One

(B) Two

(D) Four

Answer

Answer: (B) Two

67. What type of movement occurs in the sensitive plant when touched?

(A) Growth-based movement

(B) Non-growth-based movement

(D) Stem bending

Answer

Answer: (B) Non-growth-based movement

68. How do plants detect touch and move their leaves without nervous or muscle tissue?

(A) Through a nervous system like animals

(B) By using electrical-chemical signals between cells

(D) Through muscle contractions

Answer

Answer: (B) By using electrical-chemical signals between cells

69. What happens at the point of movement in a plant when touched?

(A) The plant does not react

(B) Movement occurs at the same point where the touch happens

(D) The entire plant moves

Answer

Answer: (C) Movement occurs at a point different from the touch point

70. In plants, how is information about touch communicated from cell to cell?

(A) Through nervous tissue

(B) By electrical-chemical means

(D) By hormones only

Answer

Answer: (B) By electrical-chemical means

71. What causes plant cells to change shape and enable movement in response to a stimulus?

(A) Specialized proteins

(B) Water balance changes

(D) Heat production

Answer

Answer: (B) Water balance changes

72. How do plant cells move without muscle proteins?

(A) By absorbing sunlight

(B) By changing the amount of water in them

(D) Through photosynthesis

Answer

Answer: (B) By changing the amount of water in them

73. What is the result of plant cells changing their water content?

(A) Photosynthesis

(B) Growth of new leaves

(D) Flowering

Answer

Answer: (C) Swelling or shrinking of cells

74. How do tendrils of plants like pea plants help them climb up other plants or fences?

(A) By producing flowers

(B) By growing rapidly in all directions

(D) By releasing a sticky substance

Answer

Answer: (C) By coiling around the object due to differential growth

75. What happens to the tendril of a plant when it comes in contact with a support?

(A) It stops growing

(B) The part in contact with the support grows faster

(D) The entire tendril grows uniformly

Answer

Answer: (C) The part in contact with the support grows slower

76. What are directional movements in plants known as?

(A) Reflex actions

(B) Tropisms

(D) Geotropisms

Answer

Answer: (B) Tropisms

77. In which direction do shoots of plants typically grow in response to light?

(A) Away from the light

(B) Towards the light

(D) Downwards

Answer

Answer: (B) Towards the light

78. What is the term for the movement of plant roots growing downwards in response to gravity?

(A) Hydrotropism

(B) Chemotropism

(D) Phototropism

Answer

Answer: (C) Geotropism

79. What is an example of chemotropism in plants?

(A) Growth of roots towards water

(B) Growth of pollen tubes towards ovules

(D) Growth of leaves upwards

Answer

Answer: (B) Growth of pollen tubes towards ovules

80. How do plants respond to environmental stimuli such as light or gravity?

(A) By changing their color

(B) By moving quickly like animals

(D) By producing more seeds

Answer

Answer: (C) By growing in a specific direction

81. What is the difference between the movement of sensitive plants and the growth-related movement of sunflowers?

(A) Sensitive plants move slowly, while sunflowers move quickly

(B) Sunflowers move quickly, while sensitive plants move slowly

(D) Both move at the same speed

Answer

Answer: (C) Sensitive plants move quickly, while sunflowers move slowly

82. How does the body achieve fast responses to stimuli?

(A) By using chemical compounds

(B) By using electrical impulses

(D) By increasing blood flow

Answer

Answer: (B) By using electrical impulses

83. What is a limitation of using electrical impulses for communication in the body?

(A) They can only reach cells connected by nervous tissue

(B) They can affect every cell in the body

(D) They are always faster than chemical communication

Answer

Answer: (A) They can only reach cells connected by nervous tissue

84. What happens when a stimulated cell releases a chemical compound?

(A) The compound travels rapidly to all cells

(B) The compound diffuses to nearby cells and is detected by special molecules

(D) The compound causes immediate growth in all cells

Answer

Answer: (B) The compound diffuses to nearby cells and is detected by special molecules

85. Which of the following is NOT a type of plant hormone mentioned in the text?

(A) Auxin

(B) Gibberellin

(D) Abscisic acid

(E) Insulin

Answer

Answer: (E) Insulin

86. How does auxin affect plant growth in response to light?

(A) It makes the plant grow shorter on the side of the shoot exposed to light

(B) It makes the plant grow longer on the side of the shoot away from light

(D) It causes the plant to wilt on the side of the shoot away from light

Answer

Answer: (B) It makes the plant grow longer on the side of the shoot away from light

87. What role do gibberellins play in plants?

(A) They inhibit stem growth

(B) They promote cell division

(D) They cause wilting of leaves

Answer

Answer: (C) They help in the growth of the stem

88. Where are cytokinins usually found in higher concentrations?

(A) In the roots

(B) In the leaves

(D) In the stems

Answer

Answer: (C) In the fruits and seeds

89. What effect does abscisic acid have on plants?

(A) It promotes growth

(B) It inhibits growth and causes wilting of leaves

(D) It causes plants to bend towards light

Answer

Answer: (B) It inhibits growth and causes wilting of leaves

90. What is the role of adrenaline in animals?

(A) It helps in digestion

(B) It regulates body temperature

(D) It stimulates growth

Answer

Answer: (C) It prepares the body for ‘fight or flight’ response

91. How does adrenaline affect the heart and blood flow in a stressful situation?

(A) It decreases the heart rate and increases blood flow to the digestive system

(B) It increases the heart rate and reduces blood flow to the digestive system

(D) It increases the heart rate and reduces blood flow to the muscles

Answer

Answer: (B) It increases the heart rate and reduces blood flow to the digestive system

92. Which hormone is essential for the synthesis of thyroxin in the thyroid gland?

(A) Adrenaline

(B) Insulin

(D) Growth hormone

Answer

Answer: (C) Iodine

93. What condition can result from iodine deficiency in the diet?

(A) Diabetes

(B) Dwarfism

(D) Hyperthyroidism

Answer

Answer: (C) Goitre

94. What is the function of growth hormone?

(A) Regulates blood sugar levels

(B) Stimulates growth in all organs

(D) Regulates menstrual cycle

Answer

Answer: (B) Stimulates growth in all organs

95. What causes the dramatic changes in appearance during puberty?

(A) Secretion of insulin

(B) Secretion of thyroxin

(D) Secretion of adrenaline

Answer

Answer: (C) Secretion of testosterone in males and oestrogen in females

96. Which hormone is used in the treatment of diabetes?

(A) Thyroxin

(B) Adrenaline

(D) Growth hormone

Answer

Answer: (C) Insulin

97. How does the feedback mechanism regulate hormone secretion?

(A) By increasing hormone production when levels are low and decreasing it when levels are high

(B) By producing hormones at a constant rate

(D) By regulating the release of hormones based on external temperature

Answer

Answer: (A) By increasing hormone production when levels are low and decreasing it when levels are high

98. What is the role of the hypothalamus in hormone regulation?

(A) It directly secretes all hormones

(B) It stimulates the adrenal glands to release adrenaline

(D) It controls the digestion process

Answer

Answer: (C) It releases factors that stimulate the pituitary gland to release hormones

99. Which endocrine gland is responsible for the secretion of growth hormone?

(A) Thyroid gland

(B) Pancreas

(D) Adrenal gland

Answer

Answer: (C) Pituitary gland