XSTANDARD, BSS PREPARED BY: THEJASHWINI.
X BIOLOGY
CHOOSE THE CORRECT ANSWER
2024
1. Duplicated chromosomes are joined at a point termed:
a. Centrosome b. Centromere c. Centriole d. Chromatid
2. The process of conversion of ADP to ATP during photosynthesis is called:
a. Photolysis b. Phagocytosis c. Photophosphorylation d. Poymerisation
3. The process in which water is lost from the margins of strawberry leàes is:
a. Osmosis b. Imbibition c. Diffusion d. Guttation
4. The hormone that affects urination is:
a. Adrenaline b. Vasopressin c. Oestrogen d Thy xine
5. Which of the following helps in the opening ofßtomata
a. Cobalt ions b. Potassium ions c. Magnesium ions d. Áluminium ions
6. A zygote which has Y chromosomes inherited tromthefather will develop into
a. Will depend on the chromosome inherited fromthe mother
b. Girl c. either boy or girl d. Boy
7. The ear ossicles that transport sound vibrations to the inner ear:
a. Stapes b. Malleus c. Incusd Cochlea
8. Ifa person has heart attack, what nmust be done immediately:
P. Loosen his/her clething QMake him/her lie down in an airy room
R. Rush him/her to the ospita! S. Engage him/her in a conversation
a. P and0 Pand S Rand S d. P, Q and R
9. Adjusting the focal lengthothe eye lens to view objects at different distances
is done by:
a. Cornea 6. Iris C. Ciliary muscles d. Sclera
10, Four friends P, Q, Rand S were discussing the examples of genetic disorders.
The examples they quote were as follows:
P. Colour blindness and malaria Q. Albinism and cholera
R. Haemophilia and colour blindness R. Haemophilia and albinism
Who gave the correct examples?
a. P and Q b. R and S c. P and R d. Q ands
11. Osmosis takes place when there is:
a. A freely permeable membrane b. A cell wall c. A selectively
permeable membrane d. An impermeable membrane
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12. A male gorilla has 48 chromosomes in each of its body cells. How many
chromosomes will each of the sperms have? Which of the following is correct?
a. 24 b. 48 c. 12 d. 16
13.Assertion (A): sympathetic nervous system prepares the body for violent action
against abnormal conditions
Reason (R): Sympathetic nervous system accelerates heartbeat.
Which of the following is correct?
a. Both A and R are true b. A is true, R is false c. A is false ut R is true
d. BothA and R are false
14. Birth rate is the number of live births per thousand persons Ë
a. 1 year b. 2 years c. 10 years d. 20 years
15. Industrial Melanism was observed in:
a. Mice b. Peppered Moth c. House Flies Crow
2023
16. The sex chromosome in a human ovum is:
a. X chromosome b. Y chromosome c. Both Xand Y chromosomes
d. Either X or Y chromosome
17.Which one of the following is abiodegradable waste?
a. Metal cans b. Ewaste c. Plastic d. Flowers
18.The heart sound Dup' is produced whenr
a. Semilunar valves open bAtrioventricular valves close
c. Semilunar yalves close Atrio ventricular valves open
19.Deplasmolysis uccus when aplasmolysed cell is placed in:
a. Concentrated salt solution b. Tap water c. Concentrated sugar
solation d Hypertonic salt solution
20.Alpha cells of pancyeas secrete:
a. Glycoger b. Glucose c. Glucagon d. Insulin
21.Haploid number of chromosomes are found in:
a. Nephrons b. Neurons c. Skin cells d. Sperms
22.The life span of an RBC is:
a. 120 days b. 220days c. 20 days d. 2 weeks
23.The statistical study of human population is called:
a. Mortality b. Demography c. Natality d. Equality
24.The pale yellow colour of normal urine is due the pigment:
a. Melanin b. Anthocyanin c. Urochrome d. Haemoglobin
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25.Stimulation of the nerves of the sympathetic nervous system:
a. Accelerates heartbeat b. constricts pupil of eyes
Increases peristalsis d. Retards heartbeat
26.The site of light reaction in the cells of a green leaf is:
a. Nucleus b. Grana of chloroplast c. Cytoplasm d. Stroma of chloroplast
27.The paper used to demonstrate unequal transpiration in a dicot leaf is:
a. Filter paper b. Litmus paper c. Starch paper d. Cobalt ckloride paper
28.Vitreous humour is present between:
a. Cornea and iris b. Lens and retina c. Iris and lensd. Cornea a,d lens
29.0xygenated blood to liver is supplied by:
a. Hepaticartery b. Hepatic vein c. Inferior venaçava d. Hepatic portal vein
30.During the synthesis phase of the cell cycle, more of.
a. RNA is synthesized b. RNA and proteins are synthesized
c. DNA is synthesized d. Glucose is synthesized
2022
31.The mineral element in haemoglobin
a. Manganese b. Iron c. Sodium d. Caleim
32.The number of cranial nerves in humans are:
a. 12 b. 31 pairs Ç31 d. 12pairs
33.Gigantism and Acromegaly are due to:
a. Hypersecretion f Growth hornone b. Hypersecretion of Thyroxine
c. Hyposecretion ofG wth hormone d. Hyposecretion of Thyroxine
34. Pericardium coers the:
a. Heart b. Braun c. Sp nal cord d. Eyeball
35. The circular opening in the centre of iris:
a. Lers b.,Corneae. Sclera d. Pupil
36. The blood vessel that carries oxygenated blood is:
a Pulmonary artery b. Pulmonary vein c. Renal vein d. Hepatic vein
37. Orgam of corti is present inside the:
a. Cochlea b. Semicircular canals c. Sacculus d. Utriculus
38. The structure that stores urine temporarily is:
a. Ureter b. Urethra c. Urinary bladder d. Kidneys
39. Islets of Langerhans are located in:
a. Liver b. Pituitary gland c. Spleen d. Pancreas
40. The main nitrogenous waste formed in the human body:
a. Uric acid b. Urea C. Ammonia d. Creatinine
41. The process of conversion of ADP to ATP during Photosynthesis:
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a. Polymerisation. b. Photophosphorylation. c. Photorespiration.
d. Photolysis.
42. Pernmanently open structures seen on the barks of old woody stems:
a. Stomata. b. Hydathodes. c. Lenticels d. Epidermal pores.
43. The pressure developed in the roots due to continuous inward movement of
water by cell to cell osmosis:
a. Root pressure. b. Wall pressure. c. Turgor pressure. d. Air pressure.
44. The type of gene, which in the presence of a contrasting allele ishot expressed:
a. Homozygous b. Heterozygous. c. Dominant. d. Recessive.
45. After Mitosis, a female human cell will have:
a. 44 + XX chromosomes. b. 22 + X chromosomes
c. 22 + Y chromosomes. d. 44 + XY chrotnosomes,
46. At the end of Cytokinesis is completed.
a. Metaphase. b. Prophase. c. Interphase d. Telophse.
47. The genotype of a person who cannot roll his tongue is
a. Rr b. RR C. rr d. RRr
48. A cellbecomes plasmolysed when it is placed in
a. Distilled water. b. Hypertonie. c. Isotonic. d. Hypotonic.
49. The nitrogenous base Adenine always pairs with
a. Thymine. b. Guanine. .Cytosine. d. Thiamine.
50. The basic units of heredity are
a. Chromosomes. b, Chromatids. c. Genes. d. Centrosome.
51. NADP is expanded as:
a. Nicotinamide Adonosine Dinuctcotide Phosphate.
b. Nicotinamidé Adenine Dinucleotide Phosphate.
c. Nicotinamide Adenine Dinucleolus Phosphate.
d. Nicotinamide Adenosine Dinucleolus Phosphate.
52. Transpiration i_ usefulio theplant because it:
a. Creates asuction forcefor absorption of water from the soil.
BAelpsin Photophosphorylation.
c Synthesises glucose.
d. Splits water molecules.
53. A homozygous pea plant having purple flowers is crossed with a homozygous
pea plant bearing white flowers. The phenotypic ratio of the offspring obtained
in F2 generation is:
a. 2: 1 b.l:1 c. 1:2:1 d. 3:1
54. A shoot from a balsam plant is kept in a beaker containing eosin solution
(pink). The pink colour will be distinctly seen in the:
a. Xylem b. Phloem c. Epidermis d. Cortex
55. Replication of DNA in the cell cycle occurs during the:
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a. G1 - phase. b. Anaphase. c.S- phase. d. G2 - phase.
2021
56. Ganong's Potometer is used to study:
a. Photosynthesis b. Exosmosis c. Rate of uptake of water d. Guttation
VIN
57. A plant cell may burst when placed in a hypotonic solution because:
a. Turgor pressure equalizes wall pressure
b. Turgor pressure exceeds wall pressure
c. Wall pressure exceeds turgor pressure
d. None of the above
58. The number of chromosomes in a human skin cell are:
a. 23 b. 46 c. 22 d. 44
59. Cretinism and Myxedema are due to:
a. Hyper secretion of thyroxine
b. Hyper secretion of growth hormone
c. Hypo secretion of thyroxine
d. Hypo secretion of growth hormone
60. Light dependent phase of Photosynthesis occùrring nthe green leaves of
plants, takes place in the:
a. Cytoplasm of palisade cells b. Nucleus of palisade cells
c. Stroma of the chloroplast d. Grana of the chloroplast
2020
61. The fusion of the sperm and ovumis termed as:
a. Reproduction b. Development e. Fertilization d. Embryo
62. Agranulocytes are:
a. Lymphocytes Mon vtes b. Lymphocytes, Basophils
c. Eosinophils, Basophils c. Eosinophils, Monocytes
63. Which ofthe following isot a natural reflex action?
a. Knee-jerk
b. Blinking of eyes d°e to strong light
.Salivatión at the sight of food
d. Sneezing when any irritant enters the nose
64. The structural and functional units of excretion in the human kidney is the:
a. Ureter b. Bowman's capsule c. Renal pelvis d. Nephron
65. In a human female, ovum consists of:
a. 23 pairs of autosomes
b. 22 pairs of autosomes and 1 pair of sex chromosomes
c. 22 autosomes and 1 Y-chromosome
d. 22 autosomes and 1 X-chromosome
2019
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66. While recording the pulse rate, where exactly does a doctor press on our wrist?
a. Nerve b. Vein c. Artery d. Capillary
67. In a human male, a sperm will contain:
a. Both X and Y chromosomes b. Only Y Chromosomes
c. Only X chromosome d. Either X or Y Chromosomes
68. A muscular wall is absent in:
a. Capillary b. Venule c. Arteriole d. Vein
69.On which day of the menstrual cycle does ovulation take place?
a. 5th day b. 28th day c. 14th day d. 1st day
70. Which one of the following does not affect the rate of transpiration?
a. Light b. Humidity c. Wind d. Age of the plant
2018
71. The number of Spinal nerves in a human being are:
a. 31 pairs b. 10 pairs C. 21 pairs d. 30 pairs.
72. Which one of the following is non-biodegradable?
a. DDT b. Vegetable peel c. Cardboard Bark of trees
73. Aqueous humour is present between the:)
a. Lens and Retina b. Iris and Lens
c. Cornea and Iris d. Cornea and Lens
74. AstFORg ehemieat substanee whieh-is used eH- objeets-and surfaees in-euF
-sUFFOURdings te-kiH germs:
a Cresel. b. Carbeie aeid e. Jedine d MereFeehreme
75. Which one of the following is a Greenhouse gas?
a. Oxygen b. Methane Sulphur dioxide d. Nitrogen
2017
76. The prime source of chlorofluorocarbons is :
a. Vehicular emissions Industrial effluents c. Domestic sewage
d. Refrigeration equipments
77. Peaieillin obtained fre-afungus is+
a Antibietie b. Antiseptie e AAtibedy d Antiserm
78. Marine fish when placed in tap water bursts because of:
a. Endosmosis b. Exosmosis c. Diffusion d. Plasmolysis
79. Surgical method of sterilization in a woman involves cutting and tying of:
a. Ureter b. Uterus c. Urethra d. Oviduct
80. Synthesis phase in the cell cycle is called so, because of the synthesis of more:
a. RNA b. RNA and proteins c. DNA d. Glucose
2016
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81. A plant cell may burst when:
a. Turgor pressure equalises wall pressure.
b. Turgor pressure exceeds wall pressure.
c. Wall pressure exCeeds turgor pressure.
d. None of the above
82. The individual flattened stacks of membranous structures inside the
chloroplasts are known as:
a. Grana b. Stroma c. Thylakoids d. Cristae
83. The nephrons discharge their urine at the:
a. Urinary bladder b. Urethra c. Renal pelvis d. Renal pyramid
84. Gigantism and Acromegaly are due to:
a. Hyposecretion of Thyroxine b. Hyposecretion of Growth hormone
c. Hypersecretion of Thyroxine d. Hypersecretion of Growth hormone
85. The mineral ion needed for the formation of blood clot is:
a. Potassium b. Sodium c. Calcium d. Iron
2015
86. A single highly coiled tube where spermns are stored, gets concentrated and
mature is known as
a. Epididymis b. Vas efferentia c. Vas deferens d. Seminiferous tubule
87. Chromosomes get aligned at the center of the cell during
a. Metaphase b. Anaphase c. Prophase d. Telophase
88. BEGvaeeine is effeetive against:
a. CheBera b. Mumps e. TubeFeulesis d AMeasles
89. Which one of the following is mainly associated with the maintenance of the
posture?
a. Cerebrum b. Cerebellum c. Thalamus d. Pons
90. An example of non-biodegradable waste is
a. Vegetable peels b. Sewage c. Livestock waste d. DDT
2014
91. After mitotic cell division, a female human cell will have:
a, 44 + XX chromosomne. b. 44 + xy chromosome
c. 22 + x chromosome d. 22 +y chromosome
92. The site of maturation of human sperms is the:
a. Seminiferous tubule b. Interstitial cells
c. Epididymis d. Prostate gland.
2013
93. The cell component visible only during cell division:
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a. Mitochondria b. Chloroplast c. Chromosome d. Chromatin
94. Pulse wave is mainly caused by the:
a. Systole of atria b. Diastole of atria c. Systole of the left ventricle
d. Systole of the right ventricle
95. A gland which secretes both hormone and enzyme is the:
a. Pituitary b. Pancreas c. Thyroid d. Adrenal
2012
96. BCG vaccine is used to build immunity against:
a. Poliomyelitis b. Tubereulosis c. Malaria
d. Whooping cough
97. A plant is kept in a dark cupboard for about 48 hours before conducting any
experiment on photosynthesis to:
a. Remove starch from the plant
b. Ensure that starch is not translocated from the leaves
c. Remove chlorophyll from the leaf of the plant
d. Rem0ve starch from the experimental leaf
98. The part of the human eye where rod cells and cone cells are located is the:
a. Retina b. Cornea c. Choroid d. Sclera
99. A reflex arc in man is best described as movement of stimuli from:
a. Receptor cell, Sensory neuron, relaying neuron, effector muscles.
b. Receptor cell, efferent nerve, relaying neuron, muscles of the body
c. Receptor cell, spinal cord, motor neuron, relaying neuron.
d. Receptor cell, synapse, motor neuron, relaying neuron.
2010
100. A point of contact between two neurons is termed:
a. Synapsis b. Neuro motor junction c. Synapse
101. Loss of water as droplets from hydathodes is called
a. Transpiration b. Bleeding c. Guttation
102. The technical term for the fertilized egg is:
a. Placenta b. Zygote c. Morula
103. The photo receptor cells ofthe retina sensitive to colour are:
a. Cones b. Rods c. Organ of Corti
404. Salk'svaeeine is Hsed te-buildinuAity against:
a. TuberetBesisb. Peliemyelitis e. MaBerie
2009
105.The cerebral hemispheres in mammals are connected by:
a. Corpus luteum b. Hypothalamus c. Pons varolli d. Corpus callosum
106. Insulin is secreted by:
a. Beta cells of pancreas b. Alpha cells of pancreas
c. Delta cells of pancreas d. None of the above
107. A de-starched plant is one whose:
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a. Leaves are free from chlorophyll b. Aerial parts are free from starch
c. Leaves are free from starch c. Plant is free from starch.
108. The onset of menstruation in the female is termed:
a. Ovulation b. Menarche c. Menopause d. Parthenogenesis
T H E J A S H V W I
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