Mlaneckji Cooper @ducation

Juhu Tara Road, Mumbal 400 049

Trust Srhool
PRELIMINARY EXAMINATION
- BIOLOGY PAPER
TIME: 2 HOURS
DATE: 13.01.2025
STD:X MARKS: 80

separately.
Answers to this Paper nust he written on the puper pruvided
You will not be allowed to write during the first 15 minutes.
This time is to be spent in neading the Ouestion Paper.
for writing the answers
The time given at the head ofthis paper is the time alloaed
from Section B.
Atempt all the questions frum Section Aund anyarefour )
The intended marks for questions or purts of yuestions given in brackets

SECTIOSA
(Attempt all qucstions)
15)
Question I:
Choose the correct anawes to thc questions from the given options:
(Do not copy the question, write the corect answ ers only.)
) AssertiunA): Hacmoglobin has avery strung affinity for carbun nonoxide.
ReasoniR) :It forms a table compound carbxyhaemoglobin.
kA ard Rare False
ie)A is True and R is False
(d) A is False and R is True

t) Manine fish when placed in tap water bursts becatuse of

(a) Plasmolysis
(b) Ditfusion
(c) Endosmosis
td) ExosoSis

Page I
 (a) Garreau's potoneter
(b) Ganong's potometer
(e) Furmer's potomcter
(d) Darwin's patometer
(ix) Asertion (A): Pinns is an example of a vestigal organ.
Reason ( R) :lt cannot move to gathcr the soundwaves as in other inanmals.
(a) Both A und R are True
(b) Both A and R are False
(c) A is True ard Ris False
(d) A is False and R is Truc
( Ihe caternal fentale genitalia is.
(a) Vulva
(b) Saceulus
(c) Cervix
(d) Vagina
(Ni) An exanple of biodegradahle waste is :
(a) Nylon
b) Styrofoun
(c) Livestock waste
(d) Electronic waste
(xii) A muscular wall is absent in
P. Verule

R- Capil
(a) Only P
(b) Only Q
(c) Only R
(d) Both Q and P

(xii) Assertion (A) : Interphase is a resting phase.

inactive.
Reason (R): In interlhase, the cell is tnctabol1cally
(a) Both A and R ure True
(b) Both A and R are False
(c) A is Tnue and Ris False
(d) A is False und R is True
as movement ofstimuli fnom
(AIV) A telex are in man is best described
neuron, Efector muscles.
(a) Receptor cel, Scnsory neuron, Relayingneuron, muscles of the body.
(b) Receptor cell, Efferent nerve, Relaving
3
(1) Mateh tle tems given im Column I wih the most uppropriate ones in Colunn 2 and
(5
rewtite the correct malchung pairs :
Calumnl Column 2

IRcabsorbs nost water (abuut

)und moch glucose ions
ia) Glomerulus

(b) Bowman's capsule 2. Hrcakdown of hacrnoglobin of deat RHG.

(c)I'roximal convoluted tubule 3. Receives glomen.lar fillrate
(d) Loop of Henle 4. "ltrafiltration

(e) Distal convojuted tubule 5, Sone absorption of water and sodium ios
6. Secretion ofUrine
7. Waler lost as waler vapour
8 Walls secrete potassiam
and foreign chenicals such as
penscillin and other deugs intu the forming urine
SECTION B
(Attemypt any four qestons fram this Sections )
Question 3:
(0
) Deinc Population density mitochondria, Justify the statement. (2)
in hunans Lack tucleus and
() Mature erythrocytes dormancy)
(ü) Differentiate between - Auxin and Gibberellins (secd (2
(iv) Give the cxactlocation of
(a) Kidney
(b)Thyrd od gland on which Theory of Natural Selection
is hased, (3)
(v) Explan thuee ohservable facs

Question4: (1)
K in the process ofblood coagulation?
n What is the role played by vitamin (2
(i) Difiercntiate between:
Nucleotide and Nuclcosome (components)
(2
(iii) State the Mendel's Law of Scgregution.
a dotted appearance?
(iv) Why does the cortex of the kidney showcolor (R) is dominant over white petal color (r).
color
(v) Ina certain specics of flowers. red petal ollspring
Predict the genotype and phenotype of the wheu both parents ure hctervzygous for red
(3)
pctal color (Rr).
Ouestion5
) Explain the ten Chemotropism
(2)
(ii) State any two intemal factors affecting photosynthesis (2)
(iü) Expand the follow ing biological abbrev iotions :
 (a) LI1

(N Some wonen have facial tair like ubead and mostache (ive biolugical reasons for it (2)
() Gven below ixa diagrainuatie represensation. Study he figue and answer the
follouing questions

() Label the part

b) Mentiont any one function of the put lahelled as B
ic) Explain any ons sigificance of thc pant labelled as C
Question 6:
() Explain thc term: Exudatton (0
) Give the biulugical tcm for the followg (2)
(a) The canal through whrch the testes descend into the scrotum just bcture the
birtti of the male baby.
(b) The kitd of twina femed frou two fertilued eggs.
(üi) Differentiate betwn llomo erectus and llomo habilis (cranial caFacity)
(iv) State any two forces contributing to ascent ef sap (2
) Draw anct labelled diagram of the structure ofa eross section of the human cye and name
atid label the parts that: (3
(a) Provides neuriszent e
(b)Contuns radial and circularemucles.
eeina
(e) Pretcxts retina and its nerve endings. btyih01
Questlon 7:
i) Explain : Glucose is absent in the urine ofu healthy person. (1)
(ü) Diterentiate betwech, Thigtetrucism and Grotronism (definiion)
(iii) Obscrve the diugrum given of the human heart in one phase of its activity. Stuly the same
und then answer tlie questicns:
 Cary aaratus in the cye ix apat of te
(a) Sclers
(b) Retna
( Chotod
d) Conjuntiva
()The onset of menstnuation in the fenale ts termed
(a) Ovultios
(by Menopause
(c) Menatche
(d) Parihenogenesis
whe sclutive agent thut was resnutshle for causing the cuange mpeppercd moth was:
a) Lchens
(6) Humans
(c) Birds
0) Pollation
(i) Salvation is an exarpic f
(a) Inborn reflex
(b) Conditionod releN
(c) Protective rellex
(d) Natura! fanctional reflex
mASsettion (A):A gas caustng ripenine of fruits was firt found to be emanating
Inom bananas wiich helvcd in the rpence of oranges when storel
Reason (R) Itis produced in higher plants aad furgi together.
(a) Ir both a5sertion and reason are tnie, but reason is the correct explanatiou ef assertion.
(b)lf both asscrtion atid reason are truc, but reasot is not the correct
ussertion,
explanation of
Ac) Irthe assertion is true but the
teason is falsc.
(d) If the assertion is false but the reason is frue.

(vm) ldentity thc picture iapparatus) shown bclow

 (o Reccptor cell. Spnal sund, Motor ncuroa, Relay ing neuton.
(d} Roveptor cell, Synsps, Motor nouin, Relaying nzunith

(xv) The child, frnghiencd by the koud swise, rts cuickly to Ahis nolhet. Which substance hel
in thus revpotse
(a) Amslase
(b) Thytuxine
() Inalin
(di Adrenline

Questhon 2:
() Gie the huological term for the
follow ng (5
(a) The speeific nigment
(b) 1he hmne socted by
foand in unne
(C) The process of engulfing theLeyd1g
cells
(U) The pgment
ha.teria by Nerophas
(c) The full certained in the walls of
thlakcids
compiment of DNAof an onanism.
() Anange and rewrite the
terms in cach gtogp in the corect onder
legical scqucnce beginning with thc term that is underincd as to be ina
(5)
(a)
Upxrepidermis,nsie Palisade tissucl ower cpidermis,
(bj Oslaton Partarition, Spongy tse
(c)
Fetilization, Getatua, InplattatNt
S-phase, Mitosis, Gchass, Cytokmess, Gr phase
(d) Ear osssles Pinna Cochlca,
Tympanun. Sensory hair celis
(e) Vas deterens, Fyaculatocy daxt.
() Cihse the od one out Eom the
Spinfcau lubale. Fpidsdyas, U'retthra
which the others belong folvwang terns and name the catcgory to
(5)
(a) Dilatian ef pupil. Increase in
Dhlation efbronchioles
heartheat, lncrcase in salivation, Decrcased peristalsis,
ib) Malleus, Stapes, lncus, Oval
(c Typhod, HacmoB.ilia Albrism, window. Semicircalar carals
Celoz
A e Parhutsct paper, Maslnblndness Sickle cell anemia
(e) coth, Egg menbrane. Vsking bag
Astral ruys, Cihary bedy, Sptsdle fihres,
(iv) Given helow ts mfonation abt the rocen
Chruatids
Kioa cocentration the¡ry Read the
itiformation and fill in the blarks
During daytine, the_0)in the guatd ceits photesynthesisc ahich leads to the
(2)which is further used to axtisely ump the ptassum icns of the
urtng
neiehbyunnt epidermal cells inte the guard cells Increased Kconcentration in the guard
makes th (3)0.mote watet frum the neighbouring cells is dtawn in andcells guard
cells moro () due t
 (u) ldentify und name the phasc.
(b) How many vaBves are closel in this phase and tane them.
hormones?
(V) Whch lobe of the Pituitary eland seurctes the following
(a) Oxytcin
(b) ACTH (3)
the questions that folkow
() Study the diagram gisen bekow and aaswer

5% SUCROSE
SUCROSE SOLUTION
MOLECULES
WATER
MOLECULES
0% sUCROSE
SOLUTON SEMI-PERMEABLE
MENBRANE

What phenonenon is being studicd by this set un ? sucose soiucion- A er B?

(a) tube contains more conçentratod
(b) Which limb cf the U
is the role of asemipemeable membrane shown here
(c) What

Question 8: (U)
: Nene
() Explain the ten
(2)
of the following structures:
(i) Stute the functional activity of cach
(a) Retina
(b) Eustachian tube (2)
discas.
(iu) Write tho symptoms of Addison's (2)
(iv) State two harmful ctlectsof Noise during the initotic cell division and
(v) Study the diagram given below which nls astage (3)
answer thc qucstians that follow:

7
(a) ldentify the staçe giving a suitable rasan
(b) Name the part numbered 1
(c) Namce and drawa ncat labelled diagram ef the stage that comes before.