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Class 10 Science Biology Chapter 7 MCQ With Answers
You can refer to NCERT Solutions for Class 10 Science Chapter 7 Control and Coordination to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.
Biology Class 10 Chapter 7 MCQs on Control and Coordination
Question 1.
Which of the following statements is correct about receptors?
(a) Gustatory receptors detect taste while olfactory receptors detect smell
(b) Both gustatory and olfactory receptors detect smell
(c) Auditory receptors detect smell and olfactory receptors detect taste
(d) Olfactory receptors detect taste and gustatory receptors smell
Answer
Answer: (a) Gustatory receptors detect taste while olfactory receptors detect smell
Question 2.
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
Answer
Answer: (c) Dendrite → cell body → axon → axonal end
Question 3.
In a synapse, chemical signal is transmitted from
(a) dendritic end of one neuron to axonal end of another neuron
(b) axon to cell body of the same neuron
(c) cell body to axonal end of the same neuron
(d) axonal end of one neuron to dendritic end of another neuron
Answer
Answer: (d) axonal end of one neuron to dendritic end of another neuron
Question 4.
In a neuron, conversion of electrical signal to a chemical signal occurs at/in
(a) cell body
(b) axonal end
(c) dendritic end
(d) axon
Answer
Answer: (b) axonal end
Question 5.
Which is the correct sequence of the components of a reflex arc?
(a) Receptors → Muscles → Sensory neuron → Motor neuron → Spinal cord
(b) Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle
(c) Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
(d) Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
Answer
Answer: (d) Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
Question 6.
Which of the following statements are true?
(i) Sudden action in response to something in the environment is called reflex action
(ii) Sensory neurons carry signals from spinal cord to muscles
(iii) Motor neurons carry signals from receptors to spinal cord
(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i), (ii) and (iii)
Answer
Answer: (c) (i) and (iv)
Question 7.
Which of the following statements are true about the brain?
(i) The main thinking part of the brain is hind brain.
(ii) Centres of hearing, smell, memory, sight, etc. are located in fore brain.
(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain.
(iv) Cerebellum does not control posture and balance of the body.
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)
Answer
Answer: (c) (ii) and (iii)
Question 8.
Posture and balance of the body is controlled by
(a) cerebrum
(b) cerebellum
(c) medulla
(d) pons
Answer
Answer: (b) cerebellum
Question 9.
Spinal cord originates from
(a) cerebrum
(b) medulla
(c) pons
(d) cerebellum
Answer
Answer: (b) medulla
Question 10.
The movement of shoot towards light is
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism
Answer
Answer: (d) phototropism
Question 11.
The main function of abscisic acid in plants is to
(a) increase the length of cells
(b) promote cell division
(c) inhibit growth
(d) promote growth of stem
Answer
Answer: (c) inhibit growth
Question 12.
Which of the following is not associated with growth of plant?
(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid
Answer
Answer: (d) Abscisic acid
Question 13.
Iodine is necessary for the synthesis of which hormone?
(a) Adrenaline
(b) Thyroxin
(c) Auxin
(d) Insulin
Answer
Answer: (b) Thyroxin
Question 14.
Choose the incorrect statement about insulin
(a) It is produced from pancreas
(b) It regulates growth and development of the body
(c) It regulates blood sugar level
(d) Insufficient secretion of insulin will cause diabetes
Answer
Answer: (b) It regulates growth and development of the body
Question 15
Select the mis-matched pair:
(a) Adrenaline : Pituitary gland
(b) Testosterone : Testes
(c) Estrogen : Ovary
(d) Thyroxin : Thyroid gland
Answer
Answer: (a) Adrenaline : Pituitary gland
Question 16.
The shape of guard cells changes due to change in the
(a) protein composition of cells
(b) temperature of cells
(c) amount of water in cells
(d) position of nucleus in the cells
Answer
Answer: (c) amount of water in cells
Question 17
The growth of tendril in pea plants is due to
(a) effect of light
(b) effect of gravity
(c) rapid cell divisions in tendrillar cells that are away from the support
(d) rapid cell divisions in tendrillar cells in contact with the support
Answer
Answer: (c) rapid cell divisions in tendrillar cells that are away from the support
Question 18.
The growth of pollen tubes towards ovules is due to
(a) hydrotropism
(b) chemotropism
(c) geotropism
(d) phototropism
Answer
Answer: (b) chemotropism
Question 19.
The movement of sunflower in accordance with the path of Sun is due to
(a) phototropism
(b) geotropism
(c) chemotropism
(d) hydrotropism
Answer
Answer: (a) phototropism
Question 20.
The substance that triggers the fall of mature leaves and fruits from plants is due to
(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin
Answer
Answer: (c) abscisic acid
Question 21.
Which of the following statements about transmission of nerve impulse is incorrect?
(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.
Answer
Answer: (b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
Question 22.
Involuntary actions in the body are controlled by
(a) medulla in fore brain
(b) medulla in mid brain
(c) medulla in hind brain
(d) medulla in spinal cord
Answer
Answer: (c) medulla in hind brain
Question 23.
Which of the following is not an involuntary action?
(a) Vomiting
(b) Salivation
(c) Heart beat
(d) Chewing
Answer
Answer: (d) Chewing
Question 24.
When a person is suffering from severe cold, he or she cannot
(а) differentiate the taste of an apple from that of an ice cream
(b) differentiate the smell of a perfume from that of an agarbatti
(c) differentiate red light from green light
(d) differentiate a hot object from a cold object
Answer
Answer: (b) differentiate the smell of a perfume from that of an agarbatti
Question 25.
What is the correct direction of flow of electrical impulses?
Answer
Answer: (c)
Question 26.
Which statement is not true about thyroxin?
(а) Iron is essential for the synthesis of thyroxin
(b) It regulates carbohydrates, protein and fat metabolism in the body
(c) Thyroid gland requires iodine to synthesise thyroxin
(d) Thyroxin is also called thyroid hormone
Answer
Answer: (а) Iron is essential for the synthesis of thyroxin
Question 27.
Dwarfism results due to
(a) Excess secretion of thyroxin
(b) Less secretion of growth hormone
(c) Less secretion of adrenaline
(d) Excess secretion of growth hormone
Answer
Answer: (b) Less secretion of growth hormone
Question 28.
Dramatic changes of body features associated with puberty are mainly because of secretion of
(а) oestrogen from testes and testosterone from ovary
(b) estrogen from adrenal gland and testosterone from pituitary gland
(c) testosterone from testes and estrogen from ovary
(d) testosterone from thyroid gland and estrogen from pituitary gland
Answer
Answer: (c) testosterone from testes and estrogen from ovary
Question 29.
A doctor advised a person to take an injection of insulin because
(a) his blood pressure was low
(b) his heart was beating slowly
(c) he was suffering from goitre
(d) his sugar level in blood was high
Answer
Answer: (d) his sugar level in blood was high
Question 30.
The hormone which increases the fertility in males is called
(a) oestrogen
(b) testosterone
(c) insulin
(d) growth hormone
Answer
Answer: (b) testosterone
Question 31.
Which of the following endocrine glands is unpaired?
(a) Adrenal
(b) Testes
(c) Pituitary
(d) Ovary
Answer
Answer: (c) Pituitary
Question 32.
Junction between two neurons is called
(a) cell junction
(b) neuro muscular junction
(c) neural joint
(d) synapse
Answer
Answer: (d) synapse
Question 33.
In humans, the life processes are controlled and regulated by
(a) reproductive and endocrine systems
(b) respiratory and nervous systems
(c) endocrine and digestive systems
(d) nervous and endocrine systems
Answer
Answer: (d) nervous and endocrine systems
Fill in the blanks
1. The information is acquired by the tip of the ………… of a nerve cell which sets off ………… impulse in it.
Answer
Answer: dendrite, electrical
2. Chemicals released from the nerve endings of one neuron travel through a gap called …………. to reach the next neuron.
Answer
Answer: Synapse
3. The fundamental unit of the tissues for conducting information via electrical impulses from one part of the body to another are called ………… or …………
Answer
Answer: nerve cells, neurons
4. The ………… are the quick responses produced involuntarily in human beings to protect them from the situation which may be dangerous to them e.g., touching a hot object.
Answer
Answer: reflex actions
5. The centre associated with hunger which gives a sensation of feeling full is present in the ………… part of the human brain.
Answer
Answer: fore brain
6. The spinal cord is protected by the ………… or the backbone.
Answer
Answer: vertebral column
7. Directional movement in seedling is a ………… dependent movement.
Answer
Answer: growth
8. Movement of roots away from light is an example of ………… phototropism.
Answer
Answer: negative
9. The plant hormone called ………… is involved in inhibiting growth and cause wilting of leaves.
Answer
Answer: Abscisic acid
10. The element ………… is needed for the synthesis of thyroxin.
Answer
Answer: iodine
Match the following columns
| Column I | Column II |
| (i) Thyroxin | (a) Puberty |
| (ii) Chemotropism | (b) Adrenaline |
| (ii) Body posture | (c) Tendril |
| (iv) Negative geotropism | (d) Gustatory |
| (v) Estrogen | (e) Goitre |
| (vi) Response to touch | (f) Cerebellum |
| (vii) Cell division | (g) Shoot system |
| (viii) Emergency situations | (h) Pollen tube |
| (ix) Taste | (i) Cytokinin |
Answer
Answer:
| Column I | Column II |
| (i) Thyroxin | (e) Goitre |
| (ii) Chemotropism | (h) Pollen tube |
| (ii) Body posture | (f) Cerebellum |
| (iv) Negative geotropism | (g) Shoot system |
| (v) Estrogen | (a) Puberty |
| (vi) Response to touch | (c) Tendril |
| (vii) Cell division | (i) Cytokinin |
| (viii) Emergency situations | (b) Adrenaline |
| (ix) Taste | (d) Gustatory |
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