Find here the Most Important NCERT chapter-wise Multiple Choice Questions from Class 10 Science with Answers Pdf free download. this may assist you to understand and check your knowledge about the chapters Most Important MCQ. Students also can take a free test of the Multiple Choice Questions of The chapters Most Important MCQ. Each question has four options followed by the right answer. These Most Important MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.
Q1. Which plant hormone promotes cell division?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Abscisic acid
(c) Cytokinin
Q2. 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.
(b) to inhibit growth.
Q3. 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
(d) Abscisic acid
Q4. Any change in the environment to which an organism responds is called
(a) stimulus
(b) coordination
(c) response
(d) hormone
(a) stimulus
Q5. 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
(b) effector
Q6. The longest fibre on the cell body of a neuron is called
(a) sheath
(b) cytoplasm
(c) axon
(d) dendrites
(c) axon
Q7. 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
(b) Motor nerves
Q8. A microscopic gap between a pair of adjacent neurons over which nerve impulses pass is called
(a) neurotransmitter
(b) dendrites
(c) axon
(d) synapse
(d) synapse
Q9. 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
(d) Receptors ? Sensory neuron ? Spinal cord ? Motor neuron ? Muscle
Q10. 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)
(c) (i) and (iv)
Q11. 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)
(c) (ii) and (iii)
Q12. Posture and balance of the body is controlled by
(a) cerebrum
(b) cerebellum
(c) medulla
(d) pons
(b) cerebellum
Q13. Spinal cord originates from
(a) cerebrum
(b) medulla
(c) pons
(d) cerebellum
(b) medulla
Q14. The movement of shoot towards light is
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism
(d) phototropism
Q15. 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
(c) inhibit growth
Q16. Which of the following is not associated with growth of plant?
(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid
(d) Abscisic acid
Q17. Cartisons are secreted by:
(a) pancreatic gland
(b) adrenal gland
(c) thyroid gland
(d) pituitary gland
(b) adrenal gland
Q18. Female sex hormone is:
(a) estrogen
(b) androgen
(c) insulin
(d) adrenalin
(a) estrogen
Q19. Insulin is secreted by:
(a) stomach
(b) liver
(c) pancreas
(d) kidney
(c) pancreas
Q20. In case of emergency which structure becomes very active:
(a) adrenal medulla
(b) adrenal cortex
(c) thyroid gland
(d) pancreas
(a) adrenal medulla
Q21. Growth, mental development and tissue differentiation is controlld by:
(a) glucagon
(b) parathormone
(c) thyroxine
(d) cortisol
(c) thyroxine
Q22. Heart beat is increased by:
(a) thyroxine
(b) adrenalin
(c) gastrin
(d) glucagon
(b) adrenalin
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