Control and Coordination
Class 10th Science Chapter MCQs
Control and Coordination Class 10 MCQs Questions
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
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
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
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
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
6. Which plant hormone promotes dormancy in seeds and buds?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Abscisic
acid
Answer
Answer: d
7. Roots of plants are:
(a) positively geotropic
(b) negatively
geotropic
(c) positively phototropic
(d) None of
these
Answer
Answer: a
8. Response of plant roots towards water is called:
(a) Chemotropism
b)
Phototropism
(c) Hydrotropism
(d) Geotropism
Answer
Answer: c
9. Movement of sunflower in accordance with the path of Sun is due to
(a)
Chemotropism
(b) Geotropism
(c) Phototropism
(d)
Hydrotropism
Answer
Answer: c
10. Which plant hormone promotes cell division?
(a) Auxin
(b)
Gibberellin
(c) Cytokinin
(d) Abscisic
acid
Answer
Answer: c
11. The main function of abscisic acid in plants is
(a) to promote cell
division.
(b) to inhibit growth.
(c) to promote growth of stem.
(d) to
increase the length of cells.
Answer
Answer: b
12. Fall of mature leaves and fruits from plants is triggered by which of the
following substance?
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d)
Abscisic acid
Answer
Answer: d
13. Any change in the environment to which an organism responds is called
(a) stimulus
(b) coordination
(c) response
(d)
hormone
Answer
Answer: a
14. A part of the body which responds to the in-structions sent from nervous
system is called
(a) receptor
(b) effector
(c) nerves
(d)
muscles
Answer
Answer: b
15. The longest fibre on the cell body of a neuron is called
(a)
sheath
(b) cytoplasm
(c) axon
(d)
dendrites
Answer
Answer: c
16. Which nerves transmit impulses from the cen¬tral nervous system towards
muscle cells?
(a) Sensory nerves
(b) Motor nerves
(c) Relay nerves
(d) Cranial nerves
Answer
Answer: b
17. A microscopic gap between a pair of adjacent neurons over which nerve
impulses pass is called
(a) neurotransmitter
(b) dendrites
(c) axon
(d) synapse
Answer
Answer: d
18. The highest coordinating centre in the human body is
(a) spinal
cord
(b) heart
(c) brain
(d) kidney
Answer
Answer: c
19. Main function of cerebrum is
(a) thinking
(b) hearing
(c)
memory
(d) balancing
Answer
Answer: a
20. Posture and balance of the body is controlled by
(a) Pons
(b)
Medulla oblongata
(c) Cerebellum
(d)
Cerebrum
Answer
Answer: c
21. Breathing is controlled by which part of the brain?
(a) Cerebrum
(b) Cerebellum
(c) Hypothalamus
(d) Medulla
oblongata
Answer
Answer: d
22. Which part of nervous system controls the re¬flex activities of the
body?
(a) Brain
(b) Spinal cord
(c) Cerebrum
(d)
Cerebellum
Answer
Answer: b
23. Which of the following acts as both endocrine and exocrine gland?
(a)
Pancreas
(b) Thyroid
(c) Adrenal
(d)
Liver
Answer
Answer: a
24. Identify which of the following statements about thyroxin is
incorrect?
(a) Thyroid gland requires iodine to synthesize thyroxin.
(b)
Thyroxin is also called thyroid hormone.
(c) It regulates protein,
carbohydrates and fat metabolism in the body.
(d) Iron is essential for the
synthesis of thyroxin.
Answer
Answer: d
25. Which gland secretes the growth hormone?
(a) Pituitary gland
(b)
Thyroid
(c) Hypothalamus
(d) Adrenal
Answer
Answer: a
26. The secretion of which hormone leads to physical changes in the body when
you are 10-12 years of age?
(a) Oestrogen from testes and testosterone from
ovar.
(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
27. A diabetic patient suffers from deficiency of which hormone?
(a)
Thyroxine
(b) Testosterone
(c) Oestrogen
(d)
Insulin
Answer
Answer: d
28. Which of the following endocrine glands does not exist in pairs?
(a)
Testes
(b) Adrenal
(c) Pituitary
(d)
Ovary
Answer
Answer: c
29.
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)
30.
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)
31.
Posture and balance of the body is controlled by
(a)
cerebrum
(b) cerebellum
(c) medulla
(d) pons
Answer
Answer: (b) cerebellum
32.
Spinal cord originates from
(a) cerebrum
(b) medulla
(c) pons
(d) cerebellum
Answer
Answer: (b) medulla
33.
The movement of shoot towards light is
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d)
phototropism
Answer
Answer: (d) phototropism
34.
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
35.
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
36.
Iodine is necessary for the synthesis of which hormone?
(a) Adrenaline
(b) Thyroxin
(c) Auxin
(d)
Insulin
Answer
Answer: (b) Thyroxin
37.
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
38.
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
39.
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
40.
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
41.
The growth of pollen tubes towards ovules is due to
(a)
hydrotropism
(b) chemotropism
(c) geotropism
(d)
phototropism
Answer
Answer: (b) chemotropism
42.
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
43.
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
44.
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.
45.
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
46.
Which of the following is not an involuntary action?
(a)
Vomiting
(b) Salivation
(c) Heart beat
(d)
Chewing
Answer
Answer: (d) Chewing
47.
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
48.
What is the correct direction of flow of electrical
impulses?
Answer
Answer: (c)
49.
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
50.
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
51.
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
52.
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
53.
The hormone which increases the fertility in males is
called
(a) oestrogen
(b) testosterone
(c) insulin
(d) growth
hormone
Answer
Answer: (b) testosterone
54.
Which of the following endocrine glands is unpaired?
(a)
Adrenal
(b) Testes
(c) Pituitary
(d) Ovary
Answer
Answer: (c) Pituitary
55.
Junction between two neurons is called
(a) cell
junction
(b) neuro muscular junction
(c) neural joint
(d)
synapse
Answer
Answer: (d) synapse
56.
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