Co – Ordination and Control Class 12 MCQ: Class 12 Biology MCQ Questions and Answer. Students get here all Important MCQ on Co – Ordination and Control Class 12.
Co – Ordination and Control Class 12 MCQ with Answers:
(1) Gibberellins can promote seed germination because of their influence on
(a) rate of cell division
(b) Production of hydrolyzing enzyme
(c) Synthesis of abscisic acid
(d) absorption of water through hard seed coat
Ans: (b) Production of hydrolyzing enzyme
(2) Vernalisation is subjected to plants growing in
(a) tropical
(b) Sub – tropical areas
(c) temperate area
(d) hot region/arctic region
Ans: (c) temperate area
(3) A physiological response of plants to the duration of light & darkness is a
(a) daily phase cycle
(b) Circadian rhythms
(c) biological Clocle
(d) Photoperidism
Ans: (d) Photoperidism
(4) ABA is involved in?
(a) Shoot elongation
(b) Increased cell division
(c) dormancy of seed
(d) root elongation
Ans: (c) dormancy of seed
(5) A tissue that does not form hormones is
(a) xylem
(b) Sclerenchyma
(c) both (a) & (b)
(d) None of these
Ans: (c) both (a) & (b)
(6) Plant hormones are usually
(a) Proteins
(b) Lipids
(c) Carbohydrates
(d) Aromatic Compound
Ans: (d) Aromatic Compound
(7) Phytohormones Control
(a) Growth
(b) Physiological function
(c) Rooting
(d) flowering
Ans: (b) Physiological function
(8) Kinetic [Cytokinin] was first discovered as a breakdown products of
(a) DNA
(b) t – RNA
(c) Spindle fibers
(d) m – RNA
Ans: (d) m – RNA
(9) Coconut water contain
(a) ABA
(b) Auxin
(c) Cytokinin
(d) gibberellins
Ans: (c) Cytokinin
(10) Phototropic & geotropic movements are linked to
(a) Ethylene
(b) ABA
(c) GA
(d) Auxin
Ans: (d) Auxin
(11) Gibberellins can promote seed germination because of their influence on
(a) rate of cell division
(b) Production of hydrolyzing enzymes
(c) Synthesis of abscisic acid
(d) absorption of water through hard seen coat
Ans: (b) Production of hydrolyzing enzymes
(12) Phytochrome is a
(a) Falvoprotein
(b) glycoprotein
(c) Lippprotain
(d) Chromoprotein
Ans: (d) Chromoprotein
(13) Auxin can be bioascayed by
(a) Avena coleoptiles curvature
(b) hydroponics
(c) Promotor
(d) Lettuce hypocotyl elongation
Ans: (a) Avena coleoptiles curvature
(14) Transport of auxin is
(a) Polar
(b) non – polar
(c) Symplast
(d) Apoplast
Ans: (a) Polar
(15) A widely used rooting hormone is
(a) 2, 4 -D
(b) NAA
(c) 2, 4, 5 -T
(d) Cytokinin
Ans: (b) NAA
(16) Tryptophan is the precursor of
(a) Indol – 3 – acetic acid
(b) Methionine
(c) Glycine
(d) Isopentenyl pyrophosphate
Ans: (a) Indol – 3 – acetic acid
(17) The hormone responsible for Speedling up malting process in brewing Industry is
(a) Auxin
(b) GA3
(c) Ethylene
(d) Kinetin
Ans: (b) GA3
(18) The outer layer of the adrenal gland is called
(a) adrenal Cortese
(b) adrenal medulla
(c) Cortex
(d) medulla
Ans: (b) adrenal medulla
(19) The small intestine is composed of
(a) duodenum
(b) jejunum
(c) ileum
(d) all of above
Ans: (d) all of above
(20) A nerve impulse is passed from one neuron to the other through
(a) none of Ranvier
(b) Synapse
(c) Cell body
(d) dendrites
Ans: (b) Synapse
(21) The name of antibiotic which is used to lower blood Cholesterol made by fungi
(a) Azomycin
(b) Clindamycin
(c) tetracycline
(d) Lovastain
Ans: (d) Lovastain
(22) The dome – shaped part under the chest is called
(a) Lungs
(b) brounchi
(c) Diaphragam
(d) alveoli
Ans: (c) Diaphragam
(23) The condition when plant fail to form sufficient chlorophyll called as
(a) Calluse
(b) Galls
(c) Chlorosis
(d) etiolated
Ans: (c) Chlorosis
(24) Which of the following not growth inhibitor Hormone
(a) IAA
(b) Dormin
(c) Ethylene
(d) Abscisic acid
Ans: (a) IAA
(25) The hormone responsible for apical dominance is
(a) Kinetin
(b) IAA
(c) ABA
(d) GA
Ans: (b) IAA
(26) The concentration of auxin is highest in leaves
(a) Vascular bundles
(b) Leaves
(c) growing tips
(d) Stem
Ans: (c) growing tips
(27) Movement of auxin is centripetal
(a) True
(b) false
Ans: (b) false
(28) Which part of the brain has a blood – brain barrier?
(a) anterior pituitary
(b) Posterior pituitary
(c) Pineal body
(d) Area Postrema of the fourth Verticle
Ans: (a) anterior pituitary
(29) Which midbrain cells are involved in general light reflexes?
(a) red nucleus
(b) Superior Colliculus
(c) inferior colliculus
(d) Substantia nigra
Ans: (b) Superior Colliculus
(30) Sympathetic nervous system induces
(a) Heart beat
(b) Secretion of Saliva
(c) Secretion of digestive juices
(d) all of these
Ans: (a) Heart beat
(31) Adrenalin direct effect on
(a) S. A Node
(b) B – cells of langerhars
(c) Dorsal root of Spinal Cord
(d) Epithelial cells of Stomach
Ans: (a) S. A Node
(32) Myelinated nerve fibres are found in
(a) Cranial nerves
(b) Spinal nerves
(c) both a & b
(d) Not in CNS
Ans: (c) both a & b
(33) Which of the following does not has brain?
(a) Hydra
(b) Insects
(c) Vertebrates
(d) Earthworm
Ans: (a) Hydra
(34) Unipolar neuron means
(a) Cell body with one axon only
(b) Cell body with dendrite only
(c) Only cell body
(d) An axon & dendrite with a cell body
Ans: (a) Cell body with one axon only
(35) Nissl’s Granules are found in
(a) Den drities
(b) Cell body
(c) Axon
(d) Both a & b
Ans: (c) Axon
(36) The primary hormones responsible for stress related physiological response, such as an increase in heart rate is
(a) insulin
(b) Cortisol
(c) Epinephrine
(d) thyroxin
Ans: (c) Epinephrine
(37) The closed system has higher ____ than open loop control system, this implies increased speed of response
(a) Gain
(b) Bandwidth
(c) Frequency
(d) Speed
Ans: (b) Bandwidth
(38) feedback can cause a system that is originally stable to become-
(a) Stable
(b) Conditionally stable
(c) Unstable
(d) Either more stable or unstable
Ans: (d) Either more stable or unstable
(39) Feedback can always reduce the effects of noise & disturbance on system Performance?
(a) True
(b) false
Ans: (a) True
(40) Which of the following is responsible for Hyperglycemia-
(a) Glucagon
(b) Glucocotri coids
(c) Catecholamines
(d) All of these
Ans: (d) All of these
(41) Adrenal glands are which of the following Characteristic
(a) Unpaived
(b) Paired
(c) 2 paired
(d) none
Ans: (b) Paired
(42) The location of adrenal glands are
(a) in brain
(b) in Neck
(c) in gonads
(d) Top of Kidneys
Ans: (d) Top of Kidneys
(43) Which glands have dual origin in nature
(a) thyroid glands
(b) Parathyroid glands
(c) thymus gland
(d) Adrenal glands
Ans: (d) Adrenal glands
(44) Smooth muscles, cardiac muscles & organs are regulated by
(a) Central nervous system
(b) Parasym pathetic nervous system
(c) Sympathetic nervous system
(d) Autonomic system
Ans: (d) Autonomic system
(45) Which hormone that plays a pivotal role in social bonding, sexual reproduction & child birth
(a) Oxytocin
(b) metatonin
(c) Adrenaline
(d) None of these
Ans: (a) Oxytocin
(46) The brain stem does not include
(a) Mid – brain
(b) Medulla Oblongata
(c) Pons varolii
(d) Cerebellum
Ans: (d) Cerebellum
(47) Which of the following is a major Co – ordinating Centre for sensory & motor signalling for the cevebrum
(a) Hypothalamus
(b) Thalamus
(c) Corpora quadrigemina
(d) Amygdala
Ans: (b) Thalamus
(48) 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
Ans: (b) axonal end
(49) Posture & balance of the body is controlled by
(a) Cerebrum
(b) Cerebellum
(c) medulla
(d) Pons
Ans: (b) Cerebellum
(50) The main function of abscisic acid in plant is to
(a) Increase the length of cells
(b) Promote cell division
(c) Inhibit growth
(d) Promote growth of stem
Ans: (c) Inhibit growth
(51) Which of the following is not associated with growth of plant?
(a) Auxin
(b) Gibberllins
(c) Cytokinns
(d) Abscisic acid
Ans: (d) Abscisic acid
(52) Iodin is necessary for the synthesis of which hormone?
(a) Adrenaline
(b) Thyroxin
(c) Auxin
(d) Insulin
Ans: (b) Thyroxin
(53) The growth of pollen tubes towards ovules is due to
(a) Hydropism
(b) Chemitropism
(c) geotropism
(d) Phototropism
Ans: (b) Chemitropism
(54) Dwarfism results due to-
(a) Excess Secretion of thyroxin
(b) Less secretion of growth hormone
(c) Less secretion of adrenaline
(d) Excess secretion of hormone
Ans: (b) Less secretion of growth hormone
(55) The harmone which increase the fertility in mates is called
(a) Oestrogen
(b) testosterone
(c) Insulin
(d) growth hormone
Ans: (b) testosterone
(56) Junction between two neurons is called
(a) Cell junction
(b) neuro muscular junction
(c) neural joint
(d) Synapse
Ans: (d) Synapse
(57) Human eye, the visual activity is highest at
(a) malcula lutea
(b) Optic disc
(c) Fovea centralis
(d) Optic chaisma
Ans: (c) Fovea centralis
(58) Characteristic of human Cornea is
(a) absence of blood circulation
(b) Cause cataract is old age
(c) has lacrimal glands for secreting tears
(d) Secreted by Conjuctiva & glandular layer
Ans: (a) absence of blood circulation
(59) Alzheimer disease in humans is associated with deficiency of
(a) dopamine
(b) glutamine
(c) acetylcholine
(d) Gamma Amino Butyric acid [GABA]
Ans: (c) acetylcholine
(60) The kind tissue that forms the supportive Structure in our pinna is also found in
(a) Vertebrae
(b) nails
(c) ear ossciles
(d) tip of the nose
Ans: (d) Tip of the nose
(61) After neurons carry nerve imputes from
(a) CNS to muscles
(b) CNS to receptors
(c) receptors to CNS
(d) effector organ to CNS
Ans: (b) CNS to receptors
(62) Human neutral system has
(a) CNS
(b) PNS
(c) Both (a) & (b)
(d) MNS
Ans: (c) Both (a) & (b)
(63) Which of the following is not associated with ANS?
(a) Sympathetic neutral system
(b) Parasympathetic neural system
(c) Somatic Neural system
(d) Both (B) & (c)
Ans: (c) Somatic Neural system
(64) Which of the following does not has brain?
(a) Hydra
(b) Insects
(c) Vertebrates
(d) Earth Warm
Ans: (a) Hydra
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