XSTANDARD, BSS COMPILED BY - THEJASHWINI

X BIOLOGY
Mention the functions / State two functions of:
2024 - Nil
2023
1. Blood
Transports oxygen, digested food to tissues
Transports carbondioxide from tissues to lungs
Transports urea from tissues and liver to kidneys
> Distributes hormones
> Maintains constant body temperature
º Forms clot at the site of injury
WBCs produce antibodies and engulf bacteriato protect from
infection
2. Human foetal placenta -
Allows diffusion of oxygen, glucose, amino acids fattyacids,
glycerol, lipids, vitamins, antibodies tron nother to foetus.
Allows diffusion of carbon di-oxide, urea, wastes from foetus to
the mother for elimination.
Acts as an endocrine gland and secretes Oestrogen/progesterone
3. Cerebellum -
A Coordinates muscular activities.
>
A Maintains body balance.
2022
4. Thyroxine -
Regulates basal metabolism.
Influences the general growth of the body, ossification of bones,
bodytenperature, mental development.
5. Cerebrum -
Côntrols all voluntary actions
Seat ofintelligence
Fnables us to think, reason out, invent, plan, memorize
6. Lymphocytes of blood - Produce antibodies.
7. Thrombocytes /Platelets Initiates clotting of blood.
8. Neutrophils - Phagocytosis.
2021
9. Glucagon - Stimulates breakdown of glycogen to glucose in liver.
10. Insulin Promotes glucose utilization by the body cells.
11. Lymphocytes - Already answered
12. Semicircular canals - Concerned with dynamic balance while body is in
motion.

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XSTANDARD, BSS COMPILED BY- THEJASHWINI

13. Eustachian tube Equalizes air pressure on either side of the eardrum/
tympanum so that ear drum can vibrate freely
14. Urethra Expels urine out of the body from the urinary bladder.
15. Vitreous humor
Helps in maintaining shape of the eye ball.
A
Protects retina S
& its nerve HWIN
endings.
2020
16. Ear
> Concerned with hearing.
> Concerned with body balance.
17. Ethylene -
> Causes reduction in stem elongation
> Causes acceleration of senescence.
>Helps in ripening of fruits.
18. Tears -
> Lubricates the surface of the eye
> Wash away dust particles
19.Cerebellum -Already answered
20. Placenta -Already answered
2019
21. Medulla oblongata -Controls activities (involuntaryaction) of internal organs
like breathing, peri_talsis &heastbeat.
22. Cytokinins
> Cytokinins stimulate plant growth by cell division
>In seeds cytokinins cause expansion of cotyledons.
> They promoechlorophyll synthesis in chloroplasts and delay leaf
senescence.
23. Tears Already answered
24, Coronary artery Supply oxygenated blood to the walls of the heart/muscles
of the heart.
25. Semninal vesicles Produce seminal fluid which serves as a medium for the
transportation of the sperms.
2018 Nil
2017
26. Scrotum Regulate the temperature of testis to facilitate spermatogenesis
27. Epididymis - Stores the sperms temporarily and facilitates the sperms to
mature and become motile
28. Cerebrospinal fluid- Acts like a cushion to protect the brain from shocks.
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XSTANDARD, BSS cOMPILED BY -THEJASHWINI

2016
29. Lymphocytes of blood - Aready answered
30. Leydig cells - Produce male hormone testosterone.
31. Guard cells - Regulates or controls opening and closing of stomata.
32. Eustachian tube - Already answered
33. Corpus luteum - Produces progesterone/oestrogen.
34. Amniotic fluid
> Protects the embryo from physical damage by jerks or mechanical
shocks
> Keeps an even pressure all around the embryo
Allows the foetus some restricted movements
> Prevents sticking of the foetus to the amnion
2015
35. Xylem - Conducts water upwards from rootsto all parts of the plant.
36. Ciliary body - Alters the shape of lens for viewing objects at different
distances.
37. Seminiferous tubule - Produce sperms.
38. Thyroid gland- Secretes thyroxine &calcitonin/controls the metabolic rate.
39. Eustachian tube Already answered
40. Suspensory ligament - Holds Jens in position.
41. Pulmonary semilunar valves Prevents back flow of blood into right
ventricle from pulmonary artery during yentricular diastole.
2014
42. Cerebrospinal Aluid Already answered
43. Eustachian tube-Already answered
44. Suspensory ligament of the eye -Already answered
45. Sperm duet/Vas deferensTransfer the sperms from epididymis to urethra.
46. Lenticels -Excharnge /diffusion of gases.
47. Association fheuron-Convey impulses from sensory neuron to motor neuron
48. Motorneuron-Convey impulse from central nervous system/brain or spinal
cordto effectors/muscles/ gland
2013
49. Neutrophils - Already answered
50. Ureter - Passes urine produced in the kidney to the urinary bladder.
51. Neurotransmitters- Transfers the impulses from the end of an axon to the
dendrite of the adjacent neuron.
52. Iris of the eye Regulates the size of the pupil so as to control the amount of
light entering the eyes.
53. Placenta Already answered

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XSTANDARD, BSS cOMPILED BY - THEJASHWINI

2012
54. Chordae tendinae
> Holds the flaps of tricuspid & bicuspid valve in position.
> Prevents overturning of tricuspid &bicuspid valve into atria
during ventricular systole.
55. Lymphocytes - Already answered
56. Thylakoids -
Absorbs particles of light for photophosphorylation
> Site of light reaction.
57. Beta cells of pancreas -Secretes insulin.
58. Urinary bladder - Stores urine temporarily.
59. Sphincter - Guards the opening of the bladder into urethra and relaxes only at
the time of urination under the impulse from brain.
2011
60. Yellow spot/Fovea centralis: Region of best vision brightest yision/colour
vision.
61. Coronary artery - Already answered
62. Medulla oblongata Already answered
63. Thrombocytes / Platelets - Already answered
64. Vitreous humour Already answered
2010
65. Hypothalamus - Regulates body temperature &pituitary.
66. Suspensory ligament -
67. Semicircular c¡nal
68. Seminiferous
tubules
69. Prostate gland
70. Sperm duct/Vas deferens
2009
71. Hydathodes GuttatioD.
72. Centrosòme - Initiates cell division.
73.Xylem -
74. Corpus luteum
75. Eustachian tube -
2008
76. Corpus luteum
77. Iris of eye -
78. Seminal vesicle -
79. Phloem: Transport food manufactured in leaves downwards to different parts
of plant / translocation of food.
80. Eustachian tube -

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X STANDARD, BSS COMPILED BY - THEJASHWINI

2007
Given below are the functions of certain organs/structures found in living
organisms. In each case, name the organ or structure that
81. Produces testosterone - Interstitial cells / Leydig cells
82. Is responsible for protecting the eye from sweat - Eyebrows
83. Transmits characteristics from parent to offspring -Gene/Chromosome
84. Transports water from the soil to other parts of the plant - Xylem
85. Initiates cell division CentroSome
Mention the functions:
86. Auditory nerve- Transmits impulses from the membranous labyrinthto brain
87. Ear ossicles -
Transfers vibrations from tympanum to inner earmembrane of
oval window/cochlea
> Acts as a lever & increases the magnitude of sound vibrations.
88. Ear wax -
Prevents entry of dust / foreign particles into ear
Ear wax lubricates and protects thedelicate eardrum from dust
particles and germs
Helps to keep eardrum pliable
89. Chorion Protects the developing embryo/foetus
90. Umbilical cord -Contains the blood vessels and thereby helps in the exchange
of food, respiratory gases, excretory material.
2006- Nil
2005 - Nil
2004
91. Myelin sheath-lasulates axons prevents mixing of nerve impulses.
92. Cochlea - Eriables us to ear.
93. Stoma/stomata Difiusion of gases.
94. Pinnae Directs the sound waves to auditory canal.
95. Merninges-Protects brain from mechanical shocks.
96. Amnion Protects foetus from mechanical injuries & shocks.
97. Erythrocytes/RBCs - Transports oxygen [O2] from lungs to cells.
98. Glomerulus -Ultrafiltration.
99. Organ of corti - Hearing.
100. Chloroplast -Site of photosynthesis.
101. Nephrons - Produce urine.
102. Testis - Produce sperms.
103. Endolymph - Stimulates the spiral organ to generate impulses

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