CHANDANNAGAR

ST. JOSEPH'S CONVENT. 2024-2025 Time : 2 hrs.

Class - X PRE ICSE EXAMINATION- F.M. - 80
BIOLOGY.
Date:-06.01.2025
SECTION-A(Atempt all questions ),
(lx 15 = 15 )
Question- 1. Select the correct option -
observed in -
studying the stages of evolution of man, a well developed chin is
i While
Homo sapiens Australopithecus
a) Honmo habilis b)Homo ercctus c

a green cloth. Which medical

student was asked to buy a blue cloth by his craft teacher. He bought
A
reason is responsible for this?
d Colour blindness
Hyperopia c) Cataract
a) Myopia
:
in photosynthesis are used in producing
Electrons released on splitting water molecules
c) NADP NADPH
a b) ATP.
about them?
SimaWhich of the following is definitely true
iyY Smita has an identical twin sister
a) Their features are identical to their mother.
one parent
b) They inherited genetic material only fron
identical genetic material.
c) The nuclei of their cells contain only enetic material of their parent.
halfof the genetic
d) The nuclei of their cells contain
the egg cell have ?
V How many chromosomes does
22 d) 44
a) 23 b) 46 c)
could be
noticed that a potted plant kepl in the window of his room bends towards sunlight. This
y Rajesh
due to :
region due to diffusion of auxin
a) More growth in the well lit difusion of auxin.
growth in the region away from light due to
More
due to diffusion of cvtokinin.
More growth in the well lit regionfrom
More growth in the region away light due to diffusion of cytokinin.
d
walls compared to veins
viiAssertion : Arteries have thicker
carry deoxygenated blood usually.
Reason:
Arteries carry oxygenated blood and veins
explanation ofA
correct and R is the corect
a) Both A and R are explanation of A.
correct but R is not the correct
b) Both A and R are
c) A is true, R is false.
d) A is false, R is true.
of urea?
would normally carry the largest amount
wIn mammals which blood vessel
Dorsal Aorta ) Hepatic vein d) Hepatic Portal vein
a) Renal vein b

burst when :
An animal cell may
wall pressure b) Turgor pressur exceeds wall pressure
equalizes
a) Turgor pressure
turgor pressure Turgor pressure is absent
c)
Wall pressure exceeds
Contd.
 2:- Biology . Class - X.

The nephron discharge the urine into

d)
Renal pyramid
ureter
a) Renal pelvis b) Renal cortex

to lungs is -
The chamber of the heart which pumps deoxygenated blood L.eft Ventricle
Left Auricle d)
a) Right Auricle b) Right Ventricle C)

sjY The prime source of chlorofluoro carbon is -

Industries Sewage
a) Refrigerator Vehicles
takes place is
cell ol a leaf of an aquatic plant is kept in 5% salt solution. The phenomenon that
X1) A
Turgidity and flaccidity d) Plasmolysis and Turgidity
a) Turgidity b) Plasmolysis c)

The urine output in summer is less because -

P-Kidncys reabsorb a lot of water
Q-Sweat glands are active
R -Kidneys absorb less water

S - Sweat glands are inactive

P and S R and S
a) R andQ b P and Q

Assertion : Rods and cones arc photoreceptors in the sclera.

Reason : Cones are sensitive to dim ight.

a) A is true, R is false b) A is false, Ris true c) Both A and R are true d) Both A and R are false
(5x 5 = 25 )
Question'-2.
a Name the following :
Valve present at the opening of the left auricle to left ventricle.
Observable characters genetically controlled.
Statistical study of human population.
iy?/ A pair of corresponding chromosomes of the same size and shape received one from each parent.
Structure that connects placenta and the human foetus.
b) Fill in the blanks &
The process of maintaining salt and water balance in the body is called
acts as a blood reservoir.
Platelets at the site of iniury releases
hormone controls the vigorous contraction of uterus during child birth.
uterine lining.
During phase of menstrual cycle there is thickening of the
c) Pick the odd one out and name the category to which others belong :
Prostrategland, Cowper's gland, Semniferous tubules, Seminal Vesicle.
Uerus, Urethra, Urinary bladder , Ureter.
Contd.
Tear gland , Pancreas , Salivary gland, Sweat gland
 :-3:- Biology, Class - X.

fluid.
Aqueous hunour, Lymph, Vitreous humour, Synovial
Bandages, face mask , syringes, X-rays.
d) Match the following :
Column -IIL
Column-1

Hyposecretion of Thyroxine in adult Diabetes Insipidus

Hyposecretion of Insulin 2. Myxoedema
Hypersecretion of Growth Hormone in child Dwarfism

i Hyposecretion of ADH 4 Gigantism

Hypersecretion ofThyroxine 5 Diabetes mellitus
6 Exophthalmic goitre
7. Cretinism

) Arrange in proper logical sequence starting with the underlined word.

Lungs, Liver, Posterior vena cava, Aorta, Heart.

Dorsal root ,Receptor, Effector, Ventral root, Spinal cord.
Root hair,Pericycle , Cortex, Soil water, Xylem.
Ear pinna, Membranous labyrinth , auditory canal , auditory nerve , car ossicles.
Homo habilis ,Cro - Magnon, Ramapithecus , Homo erectus, Neanderthal man.

SECTION-B.
Attempt any four questions All the questions carrv 10 marks (1 +2+2+2+3 ).
Question -3.
Give the scientific name of the moth involved in industrial melanism.
)
Give the genotype and phenotype of F1 generation if a red flower variety of pea (Rr) is crossed
with a white flower variety( r r)
iii Apatient was diagnosed with ablockage in one ofthe coronary arteries, restricting blood flow
to the heart muscles. The doctor advised immediate surgery to insert a stent.
a) From where does this coronary artery arise?
b) Why was it necessary to insert the stent?

iv Draw a well labelled diagram of a single nucleotide.

V) Study the diagram and answer the following questions ;

a) Name the phenomenon shown.

b) Label part 1
phenomenon
c) Give the significance of this
Contd......
 :-4:- Biology , Class - X.
Question-4.

Give the exact location of thyroid gland.

Give the balanced chemical equation for photosynthesis.
i) Name two hormones secreted by corpus luteum.
i Draw a well labelled diagram to represent Myopia.
Study the diagram and answer the questions.

WHY AREN'T WE?

Name the climatic phenomenon shown.

5Give one effect of this phenomenon.
c/Mention one measure that can be taken to prevent this climate change.
Question -5.
Give the full form of NADP.
Name the surgical methods used for population control.
If a variegated leaf is taken to perform starch test what will vou observe?
Draw a neat labelied diagram of malpighian capsule.
Study the diagram and answer the following :

/a) jdentify the stage.

) Gjve a suitable reason for your unswer.
oY Name the stage that follows the stage shown. Contd.. ....
 :-5:- Biology , Class- X.
Question - 6. s
Define nmenarche.
Mention two objectives ofSwachh Bharat Abhiyan.
even
A boy accidentally touched a hot pan and immediately withdrew his hand. He reacted
before thinking about the pain.
A) Which part of the nervous system is involved in this response?
b) What is the biological term used for such immediate action?
Draw a well labelled diagram of a chloroplast
Study the diagram and answer the following :

Sands

Th:stle funel
-Supar olutnon
-Seupneable menbrane
Lpure water

.a What will you

What does observe few hours?
the sugar solution represent in a plant cell?
c)efine the process demonstrated.
Question - 7

Name one vestigial organ in man.

ii) A farmer sprayed a homone on his tomato plant and noticed that the fruits ripened faster.
a) Name the hormone sprayed.
b) Define parthenocarpy.
iii) Mention one difference between the two types of cell divisions based on the number of daughter
cell produced. Contd...
Draw a well labelled diagram of the cross section of an artery.
V) Study the diagram and answer the following :

’3

a) Give the number and name of the structure where fertilization takes nlace
b) How long does the embryo develop in the part labelled 2?
) Name the extra embryonic membranes
sertally trom outside to inside that protects the
embryo.
Contd
 :-6:- Biology, ClSS - X.

Question -8.w

Blood flovs in glomerulus under high pressure. Why?

The number of asthma patients increases during winters in cities like Delhi. Justify.

If you enter adark room from a brightly lit area what do you experience? Explain the role of
photoreceptors in this case.
Draw a vell labelled diagram of a matured sperm.
y Study the diagram and answer the following:

Lcafy shoot

Reservoir to reset Dubble

Vaseline seal

Scaie

Bubble

Name the instrument shown.

What does it measure?

cGive the function of the reservoir.