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Plant Physiology mcq with Answers. We covered all the Plant Physiology mcq with Answers in this post for free so that you can practice well for the exam.
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mcq on Plant Physiology for Students
Which gland is responsible for producing growth hormone?
a) Pituitary gland
b) Thyroid gland
c) Hypothalamus
d) Adrenal gland
Option a – Pituitary gland
Physical changes at the age of 10–12 are triggered by the secretion of which hormones?
a) Oestrogen from testes and testosterone from ovaries
b) Estrogen from adrenal glands and testosterone from the pituitary gland
c) Testosterone from testes and estrogen from ovaries
d) Testosterone from the thyroid and estrogen from the pituitary gland
Option c – Testosterone from testes and estrogen from ovaries
A person with diabetes has a deficiency of which hormone?
a) Thyroxine
b) Testosterone
c) Estrogen
d) Insulin
Option d – Insulin
Which one of the following endocrine glands is unpaired in the body?
a) Testes
b) Adrenal
c) Pituitary
d) Ovary
Option c – Pituitary
What is the chief coordinating organ in the human body?
a) Spinal cord
b) Heart
c) Brain
d) Kidneys
Option c – Brain
What is the primary function of the cerebrum?
a) Thinking
b) Hearing
c) Memory storage
d) Maintaining balance
Option a – Thinking
Which part of the brain is responsible for maintaining body posture and balance?
a) Pons
b) Medulla oblongata
c) Cerebellum
d) Cerebrum
Option c – Cerebellum
Which brain region manages the breathing process?
a) Cerebrum
b) Cerebellum
c) Hypothalamus
d) Medulla oblongata
Option d – Medulla oblongata
Which part of the nervous system handles reflex actions?
a) Brain
b) Spinal cord
c) Cerebrum
d) Cerebellum
Option b – Spinal cord
Which of the following functions as both an endocrine and exocrine gland?
a) Pancreas
b) Thyroid
c) Adrenal gland
d) Liver
Option a – Pancreas
Identify the incorrect statement regarding thyroxine:
a) Iodine is needed by the thyroid to produce thyroxine
b) Thyroxine is also called the thyroid hormone
c) It helps regulate metabolism of proteins, fats, and carbohydrates
d) Iron is necessary for thyroxine synthesis
Option d – Iron is necessary for thyroxine synthesis
Which plant hormone encourages cell division?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Abscisic Acid
Option c – Cytokinin
What is the primary role of abscisic Acid in plants?
a) Stimulates cell division
b) Restricts plant growth
c) Promotes stem growth
d) Extends cell length
Option b – Restricts plant growth
Which plant hormone causes mature leaves and fruits to fall off?
a) Auxin
b) Cytokinin
c) Gibberellin
d) Abscisic Acid
Option d – Abscisic Acid
What is the term for any environmental factor that causes a reaction in an organism?
a) Stimulus
b) Coordination
c) Response
d) Hormone
Option a – Stimulus
What is the name for the body part that acts in response to signals from the nervous system?
a) Receptor
b) Effector
c) Nerves
d) Muscles
Option b – Effector
The longest projection emerging from a neuron’s cell body is known as:
a) Sheath
b) Cytoplasm
c) Axon
d) Dendrites
Option c – Axon
Which nerves carry signals from the central nervous system to muscles?
a) Sensory nerves
b) Motor nerves
c) Relay nerves
d) Cranial nerves
Option b – Motor nerves
The small gap between two adjacent neurons across which nerve signals travel is called:
a) Neurotransmitter
b) Dendrites
c) Axon
d) Synapse
Option d – Synapse
How do plant roots respond to gravity?
a) Positively geotropic
b) Negatively geotropic
c) Positively phototropic
d) None of these
Option a – Positively geotropic
What term describes the response of plant roots toward water?
a) Chemotropism
b) Phototropism
c) Hydrotropism
d) Geotropism
Option c – Hydrotropism
Why does a sunflower turn toward the sun throughout the day?
a) Chemotropism
b) Geotropism
c) Phototropism
d) Hydrotropism
Option c – Phototropism
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