Std: X
BIOLOGY
Reading time: 15 mins
Max marks: 80
Writing time: 2 Hours
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This Question paper has 10 pages.
General Instructions
Answers to this paper must be written on the paper provided separately.
Attempt all questions from section I and any four questions from section II.
The intended marks for questions or parts of questions are given in brackets [
Section I ( 40 marks)
Question: 1
a)Name the following:
( 5 marks)
1) A membrane that disappears during late prophase
2) A fluid that occupies that larger cavity of the eyeball behind the lens
3) The ground substance present in chloroplast
4) A specific part of a chromosome that determines hereditary characteristics
5) A neurotransmitter
b) State whether the following statements are true or false. If false, write the
correct form of the statement by changing the first or last word only ( 5 marks)
1)The resting stage in mitosis is called interphase.
2) Photosynthesis occurs in all the cells of the plant.
3) The pituitary gland is both exocrine and endocrine in function.
4) Chemicals applied to spots and places to kill harmful microorganism are
Called disinfectants.
5) All voluntary actions are controlled by the cerebellum.
c) Give the specific function of the following structures found in the body of
Plants/ animals.
( 5 marks)
1) Hydathodes 2) Centrosome 3) Xylem 4) Corpus luteum 5) Eustachian tube
]
d) Given below are six sets with four terms each. In each set a term is an odd one and
cannot be grouped in the same category to which the other three belong. Identify the odd
one in each set and name the category to which the remaining three belong. The first one
has been done as an example.
( 5 marks)
Example: Fructose, Sucrose, Glucose, Calcium
Odd term: Calcium
Category: Carbohydrates
SET
ODD TERM
CATEGORY
(i) Sneezing, coughing,
blinking, typing
(ii) ADH, TSH,
ACTH
NADPH,
(iii)
Tympanum,
cochlea, utriculus
(iv)
lamellae,
macula,
Stoma, stroma,
quantosome.
(v) Basophil, neutrophil,
Eosinophil, lymphocyte.
e) Given below are five sets of five terms each. In each case, rewrite the terms in
logical sequence as directed at the end of each statement.
( 5 marks)
1)Vagina, Ovary, Uterus, Oviduct, Cervix, (Path of egg after ovulation)
2) Motor Neuron, Receptor, Sensory Neuron, Effector, Asoociation Neuron ( Path
Way of a nerve impulse)
3)Pupil, Yellow spot, Cornea, Lens, Aqueous humour ( Path of entry of light into
the eye from an object)
4) Stoma, Mesophyll cells, Xylem, Substomatal space, Intercellular space ( loss
Of water due to transpiration)
5) Cortical cells, Root hair, Soil, water, endodermis, xylem ( entry of water into the
Plant from the soil)
f) Study the following diagram carefully and then answer the questions that follow:
( 5 marks)
(i)
Name the parts labelled 1, 2, 4 and 6.
(ii)
Give the number and name of the vessel which contains the maximum amount
of urea a few hours after a protein rich meal.
(iii)
Draw a neat, labelled diagram of the cross sectional view of the blood vessel
numbered 3.
(iv)
Mention two structural differences between blood vessels ‘3’ and ‘8’.
g) Write the exact location of the following:
( 5 marks)
1) Lenticels 2) Prostate gland 3) Thyroid gland 4) Centrosome 5) Mitral valve
Page 3 of 10
h) Rewrite and complete the following sentences by inserting the correct word
in the space indicated:
( 5 marks)
1)_________ vaccine is given to build up immunity against polio
2)Phenotype is the observable characteristic which is __________ controlled.
3) Wooden doors swell up in rainy season due to ____________.
4) The blood vessel that begins and ends in capillaries is the _______.
5) __________ is the phenomenon of contraction of the cytoplasm from the
Cell wall.
[5]
Section II
Attempt any four questions from this section
Question: 2
a)Given below is a diagram of the lateral section of a testis of a man. Study the same and
answer the questions that follow:
( 5 marks)
i)Label the parts numbered 1 to 4 of the diagram.
ii) State the functions of the parts labelled 1 and 3.
iii) What is significance of the testes being located in the scrotal sac outside the abdomen?
iv) What is the role played by the inguinal canal?
v) What is semen?
b) Complete the following table by filling in the blanks from 1 to 10 with appropriate
terms:
( 5 marks)
S.NO
Gland
Secretion
Function/ Effect of body
1
Thyroid
(i)
(ii)
2
(iii)
Vasopressin
(iv)
3
(v)
(vi)
Promotes glucose utilization by the
body cells
4
Lacrimal gland
(vii)
(viii)
5
Adrenal medulla
(ix)
(x)
Question: 3
a)Study the diagram given below and then answer the questions that follow:
( 5 marks)
i)Name the region in the kidney where the above structure is present.
ii) Name the parts labelled 1,2,3,4.
iii) Name the stages involved in formation urine.
iv) What is technical term given to the process occurring in 2 and 3?
v) Explain the precess briefly.
b) Give scientific reasons for the following:
i) Photosynthesis is considered as a process supporting all life on earth.
ii) A matured mammalian erythrocyte lacks nucleus and mitochondria.
iii) Potato cubes when placed in water become firm and increase in size.
iv) Urine in slightly thicker in summer than in winter.
v) People living in hilly region usually suffer from simple goiter.
( 5 marks)
Question: 4
a)The diagram given below is an experiment conducted to study a factor necessary for
photosynthesis . Observe the diagrams and then answer the following questions: ( 5 marks)
i) What is the aim of the experiment?
ii) Name the test performed on the leaf and the solution used for the test.
iii) What type of leaf was used for the experiment? Give example.
iv) What is the expected result of the above test on the parts labelled A and B?
v) Give a balanced chemical equation to represent the process of photosynthesis.
b) Define the following:
i) Root pressure ii) Allele iii) Pulse iv) Reflex action v) Synapse
( 5 marks)
Question: 5
a)Given below is the diagram of an apparatus set up to study a very important
physiological process:
( 5 marks)
i)Name the process being studied
ii) Explain the process
iii) What change would you observe in the thistle funnel containing sugar solution after about 10
minutes?
iv) Is sugar solution Hypertonic or Hypotonic?
v) Name the part of the plant cell which is represented by the sugar solution.
vi) Explain why much salt is added to pickles.
b) Give the biological technical term for the following:
( 5 marks)
i)Cessation of menstruation in females.
ii) An eye defect in which the cornea becomes uneven.
iii) The period of complete intrauterine development of the embryo.
iv) Inflammation of meninges.
v) Non identical twins produced by the fertilization of two eggs.
vi) Membrane that protects the foetus and secretes a protective fluid.
vii) Process of conversion of several molecules of glucose to one molecule of starch.
viii) The photosensitive pigment present in the cone cells of the retina.
ix) The fluid present in the anterior part in front of the eye lens.
x) Extracts of toxins secreted by bacteria
Question: 6
a)The diagram given below depicts the cross section of the spinal cord. Study the same and
then answer the questions that follow:
( 5 marks)
i)Name the process that is being depicted.
ii) Name the parts labelled 2, 5 and 6.
iii) Name the cells in contact with the part labellled ‘1’.
iv) What is the function of the parts labelled 3, 4 and 7? What is technical term given to the
pathway represented by 3 , 4 and 7?
v) How does the arrangement of cells in the spinal cord differ from that in the brain?
b) Differentiate between the following on the basis of what is given in brackets: ( 5 marks)
i)Myopia and Hypermetropia ( condition of eyeball)
ii) Rods and Cones ( Pigment present)
iii) Tonoplast and Plasma membrane ( Location)
iv) Wall pressure and Turgor pressure ( Explain briefly)
v) DPT and BCG ( Expanded form of the vaccine)
Question: 7
a)The diagram given below is that of a developing human foetus in the womb. Study the
same and then answer the questions that follow:
( 5 marks)
i)Name the parts labelled 1 to 5.
ii) Mention any two functions of the part labelled 2.
iii) Explain the role played by the part labelled 3.
iv) What is the normal gestation period ( in days) of the developing foetus?
v) Name the endocrine gland present in the given structure. Write the hormone secreted by the
endocrine gland.
b) a) Read the following crosses carefully . After reading, Workout the cross until F2
generation and then answer the questions given for each genetical crosses separately.
( 5 marks)
A Green pod producing variety ( G) is crossed with yellow pod variety.
i) Write the Genotype of the parental combination
ii) How many types of gametes can be formed from the parental combination?
iii) Write the phenotype and genotype of the F1 generation
iv) How many types of gametes can be formed from F1 generation?
v) Write the phenotype and genotype of F2 generation.
vi) write the phenotypic ratio and genotypic ratio of the cross
vii) Name the state the law/laws proposed based on the given cross.
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