Kerala Plus One Answer Key 2025 Geography

-LI
FIR,ST IIIGIII]R SF',CONDARY EXAMINATION _ 2025
FY - 337
VERSION - A
Q.N Sub. Value Points Split Score Total
o. Qn Score
1 b; Normal T,apse lLate 1

2 a) (iravity 1
j

3 <-) Nilgiri biosphcrc rclscrvc 1

4 d) 13iodiversity l
5 a) Albedo 1

6 b) Anaimudi 1
-7
To define greenhouse effect I
Tc, identify any 2 greenhouse gases 1 2

All the processes that warm the
atrrosphere are collectively termed as
the greenhouse ef[ect.
Greenhouse Gases -- Carbon Dioxide,
Nitrous Oxide, Ozone, Methane,
C l'r lorof I uorocarbo n s

B l.Orogenic processes
2. Epeirogenic processes
U2* 4 2
3 Earthquake
4. Plate tectonics
j-
I

9 A - Ilegional Studies
I) llegional Arralysis 712* 4 2
C - Micro l{egional Studies
D lJrban planning
1 0 Origin - Chemayung Dung glaciers
Tributaries - Subansiri, Manas,
* I
Dihang, Dibang, Lohith (Any 2)
i
?
1
I
I (.racking, sliding, collapse, fire, tsunami,
!
fa ling objccp, flood t'.tc. 1t2+ 4 2
I 1C.tr any othef relevant points)
J----

i, a) Heating by solar energy
b) Wind 7t2* 4
c) Gravity
d) c{rior is force
l

r3 (i t cirrus -I'hin fcathcry appcarance
(ir) curnulus -l,ook like cotton wool
iiii) Stratus -- layerecl cloud covering large
p( rtioll of the sky,
(ir ) Nirttbus Illack or clark grc1, in colour 1t'2*4 , 2

I
I4 * Carbon dioxide is meteorologically a
very important gas
* CO2 is transparent to the incoming
solar radiation but opaque to the lil 2

outgoing terrestrial radiation
* lt absorbs a part of terrestrial radiation
and reflects back some part of it towards
the earth's surface
* Carbon Dioxide is largely responsible
for the greenhouse efflect
(Any 2 points)
15 i) Analysis of properties of matter
ii) Meteors
112 * 'L 2
iii) Gravitation
iv) Magnetic field
v) Seismic activity
v) Earthquake
(Any 4 points)
16 l) -'lbpography
C - Climate 712* 4 2
D - Biological Activity
E - Time
(Arrange in any order)
t7 To identifv Trooical Deciduous forests t
* These are the most widespread forests
in lndia.
* They are also called the monsoon
2
forests
* found in monsoon rainfall areas-
annual rainfall between 70-200cm
* Types -
a) Moist deciduous forest
b) Dry deciduous forest
( Any 2 relevant points) 1

* Running water
18 - V shaped valley - Ox 1

bow lake
* Wind Mushroom rock - Barchan
- 1 2

19 1. Latitude /a r.r, cz ^I.|JFZ5A A Suve-
The Tropic of Cancer passes "t,
@lrO[+2

through the central part of lndia in east-
-[lrus, northern part of the
west direction
lndia lies in sub-tropical and temperate I

I
l

3
I
I

l
I
zone and part lying south of thc
I

Tropic of C
l

I
cer falls in the tropical zone
!

I
2
;

I
The lofty Himalayas in the north
:

al,rng with its extensions act as an
e{:ective climatic divide. The towering
mcuntain chain provides an invincible 1+1+1
shreld to protect the subcontinent from
the cold northern winds
3 Distribution of l6nd and water
lndia is flanked by the lndian
Ocean on three sides it the south and
girdled by a high and continuous
mountain-wall in the north which make
difference in air pressure causes reversal
irr the direction of monsoon winds
4 Distance from the Sea
With a long coastline,large coastal
areas have an equable climate. Areas in
the interior of lndia are far away from the
n'oderating influence of the sea. Such
areas have extremes of climate.
5 Altitude
Temperature decreases with
h,:ight.Due to thin air, places in the
niountains are cooler than places on the
P:ai ns
6 Relief
The physiography or relief of lndia
arso affects the temperature, air pressure.
direction and speed of wind and the
amount and distribution of rainfall. The
i

I
u,indward sides of Western Ghats and
I

I Assam receive high rainfall
I

( Explain any 3 factors) 3
i

i20
1
l. Divergent Boundaries
i

!
ll. Convergent Boundaries
i
Il!. Transform Boundaries
I. Diyergent Boundaries or
( onstructive M?rgins

,4-
8
* Area where two plates pull away from
each other
* As a result new crust is generated
The sites where the plates move away
from each other are called spreading
sites
* The best example - IVlid-Atlantic Ridge
lll. Convereerrt Boundaries
x Area where two plates moving towards
each other
* As a result, the crust is destroyed as
one plate dived under another
* The location where sinking of a plate
occurs is called a subductioir zone
ill Bou daries
* Area where plates slide horizontally
past each other
* Crust is neither prodrrced nor destroyed
* To identify plate boundaries 1 1t2
* To Explain each boundarY 1y'2 3

2r STRUCTURE OF THE EARTH
The Crust
* lt is the outermost solid part of the
earth
* lt is brittle in nature
* Oceanic crust is thinner as compared
to the continental crust
The Mantle
x The portion of the interior beyond the
Crdst
* The boundary separating Crtrst from
N/antle: Mohorovicic Discontinuity
t The mantle extends from lVoho's
discontinuity to a dePth of 2,900 km
* The upper Portion of the mantle is
called asthenosPhere
The Core
* lnner most laYer
* The core is made uP of verY heavY
material

58
* Referrcd NIFE laycr (Nickel i lron)
( Answer 2 points in each layer )
To each layer
1U2 3
Tb explain each layer 7U2
22 1, Conduction
When two bodies of unequal
tc'mperature are in contact with one another,
tlrere is a flow of energy from the warmer to
crroler body.'I'his process is called 1+1+1 3
crlnduction
2. (lonvcction
I

I
I'he process of vertical heating of
:

l
i aunosphere is knoun as Convection.
I 3 Advection
I he processes of the transfc.r of lieat
j
tlirough horizontal movemenr ol air is called
L
arlvection
I 23 a) A - Stalactite
I 1

B - Piller 1
b)
! Underground water 1

24
i
Andaman and Nicobar island
I
x Andaman and Nicobar island
I
located in
Bay of Bengal
* They are volcanic origin
:* The Barren lsland is the only active
volcano in lndia (Nicobar lsland)
* There are approximately 572
islands
* Capital - Port Blair
* The Andaman in the north and
the
Nicobar in the south are separated by a
water body which is called the Ten
degree channel
* N/ountain Peak: Saddle peak
x To identify island group
i
To wlile 2 relevant poi nts
] llv 1+1 3
25 Stage I
i ln the beginning, all matter forming the
, Lrnivcrse existr,'cl in one lllacc in the orrl of
f
, "tinv t;all" (singular atonr) with an l+ 11 1 3
unimaginahrly srnall volumc, inf irrirc
tcmperature and infinitc densitv
litage 2
Ar the tSig llang the "tin-y ball" exploded
,. iolently
and led to huge expansion which
t rok placo 1.1.7 bill ion years llcfore the

9I
prescnl.
Stage 3
Within 300,000 years from the l3ig Bang,
temperature dropped to 4,500 K (Kelvitt)
and gave rise to atomic matter
26 a Guyots 1

b Atoll 1

C Thermocline 1 3

27 * To identify The Northern 1

Plains
* To explain the subdivision 3 4
l._BhaLar
* Narrow belt ranging between B-
1"0 km
* Parallel to the Shiwalik foothills
* The streams and rivers coming
from the mountains dePosit heavY
materials of rocks and boulders
* Rivers disappear in this zone
2. Terai
* South of the Bhabar is the Tarai
belt
* width of 10-20 km
* where streams and rivers re-
emerge without having anY
properly demarcated channel
creating marshy and swamPY
conditions
* Luxurious growth of natural
vegetation and houses a varied
wild life
3. Alluvial plain
* The south of Tarai is a belt consisting
of Alluvial Plains- Bhangar and Khadar
* Bhangar: The old alluvial dePosit
* Khadar: The new alluvial dePosit
Known for Sunderban Delta, the largest
delta in the world
28 a GEOSTROPHIC WIND - ThC WiNd
blows parallel to isobar is known as 1

Geostrophic Wind.
b FRONT- The separating zone between 4
warm and cold air masses is called 1

Front
C WATER SPROUT - Tornado over the 1

sea is called water sProut
d SEA BREEZE - During the daY the land 1

heats up faster and become warmer
than the sea. Thus ,pressure gradient
from sea to land is created and the wind
blows from sea to land

+
a
5

29 1. Spring tides
* Spr,ng Tides re formed when the sun,
2
the rroon and the earth are in a straight
line
* The: height of the tide will be higher 4

* The:y occur twice a month, one on frrll
moori period and another during new
moon period.
Z_\!_eap tides
x When the sun and moon are at right
angles to each other and the forces of
the s-rn and moon tend to counteract
one i noth€r, the neap tides are formed
x l-here is a seven day interval between 2
the spring tides and neap tides
x '[he height of the tides are
comparatively low
30 *'Ib identify Alfred Wegner
1 Tlre Matching oLCoqtinents (Jiq.
Saw-fil)
* -fhe shorelines of Africa and South
America facing each other have a
remarkable and unmistakable match.
4
* A map produced using a computer
programme by Bullard in 1964 shows the
Atlantic margins are perfectly matched.
2. Rocks of Same Age across the
Qgeatts
x The radiometric dating methods
developed in the recent period shows
that the belt of ancient rocks of 2,000
million years from Brazil coast matches
with those from western Africa.
* lt is formed during Jurassic Age.
x Tlris suggests that the ocean did not
exist prior to that time
3._J iltite
x Tillite is sedimentary rock formed out
lof deposits of glaciers.
I

lt T re Gondawana systems of sediments
l, _-.__ L___ _ ,.i

g
*
t-
are found in lndia have a remarkable
match with the sediments from Africa,
Falkland lsland, N/adagascar, Antarctica
and Australia.
4. Placer Deposits
* The placer deposits of Ghana are
derived from the gold bearing veins in
Brazil plateau when the two countries lay
side by side
5. Distribution of Fossils
* Lemur is found in lndia, Africa and
lVladagascar
* The only two places where lVesosattrtts
fossils have beetr fottnd "16 far are the
lraver Rock Formation in Brazil and the
Southern Cape Province of South Africa.
* All these indicate that all these
landmasses once lay together. 3
* To Explain any 3 evidences
31 a Focus or Hypocenter:- The point where 1

the energy is released
Epicenter:- The point on the surface, 1

nearest to the focus (lt is the first one to
experience the waves)
Tvpes of Earthquakes
b 1. Tectonic Earthquake
2. Volcanic Earthquake
3. Collapse Earthquake
4. Explosion Earthquake
5. Reservoir lnduced Earl:hqtrake
2 4
(Ary 4 types)
32 a Palk Strait 1

b Tropic Of Cancer 1 4

c Western Ghats 1

d Luni 1

r,F,^J[.S-J la,a_s
@_
2, Aon,f ,A4 -@ ; c'Y')
3^ l(qrrn4r)V L
4. *retr. \,e<_
..-,