Kerala Plus Two Answer Key 2025 Botany

i
Code No sY 426
SECOiID YEAR HIGHER SECONDARY EXAMINATION MARCH
PART. III
SUBJECTI
30 scoREs 1l{ouR
Qn. Sub Ansurer Key I Value Points Score Total
No. Qn.
Score
PARTI 1-5(Any3l 3x1=3
1 C / Nitrogen and water soluble sugars 1 1

a Microiniection 1 1

3 Amnensalism 1 1

4 Recombinant pnotein 1 1

E Groundnut 1 1
PART !l 6 - 16 (Any 9l 9xZ = 18
Iapetum nourishes the developing pollen grains / male
E qametophyte I any relevant answer. 1
B 2
b fapetal cell possess dense cytoplasm / they possess more 1
than one nucleus / multinucleate {any one point)
* Treating the bacterial cell with specific concentration of
divalent cation such as calcium.
7
* lncubate the cells with recombinant DNA on ice. Llzx4 2
* Place the bacterial cell at 42oC / heat shock,
* Putting them back on ice.

It is the rate of production of organic rnatter {biomass}
E 1-
during photosynthesis I by,plants
Plant species inhabiting a particular area /
r.-l
Photosynthetic capacity of plants / 2
b availability of nutrients I l"
Environmental factors (Sunlight / temperature / moisture)
(any relevant points)

No segregation of characters in the hybrid progeny I
Apomictic seeds are used in hybrid seed industry /
Cl
hybrid seeds with a combination of desirable characters /
Farmers do not have to buy hybrid seeds every year 2 2
because apomixis preserve good characters over
generations of crop plants /
Cost effective {any one point)
E It is the measure of number of individuals living within a 1
specific area / size of population
counting the umber,
m ring the cover or biomass, 2
b marks and I pellets (for tiger census). L/z
x2
ative density / example related explanation,
ng the in a bacterial culture
2 nts

Column 1 Column 2
1 ADA deficiency Genetherapy Yz

11 2 Human s lactalbumin Rosie Yz 2
E ELISA AIDS th
IL a-1 Antitrypsin Emphysema th
Fig plant is pollinated by wasp and wasp uses the fruit as
egg laying place (Fig tree - wasp interaction)
Ophrys orchid pollinated by bees and male bees attracted
towards the flower for pseudocopulation.
t2 Plants need animals for pollination 1+1- 2
Animals help in seed dispersal
Pollinators receive a reward in the form of nector I poilen
(any two points)
E Somatic hybridisation 1
r.3 2
b Somaclones 1

Yes / the staternent is true / the species facing competition 1
might evolve mechanism that promote co-existence
* resource partitioning - different times for feeding /
t4 * different foraging pattern I 2
x Mac Arthur explains co-existence with
5 species of 1
warblers living on the same tree - change their foraging
time (any one point) OR
(Abr:ve mentiond any two points give full gcore)
Grazrng food chain - Plants / phytopla Yz
a Detritus food chain - Detritus I dead organic matter I leaf
15
litter Vz 2

b Grazing food chain 1

Disarmed Agrobacterium tumifaciens is used to transfer
16 the DNA into the host cell (plant cell)
Disarmed retrovirus is used to transfer the DNA into animal 2 2
cell. (any one point)
PART lll LT - ZA (Any 3) 3x3=9
e n gra ns are protected by m ucil a genous coveri ng I
nwetta ble sti aP) mal
F emale flowers have long coiled sta tk I

FI
Female flowe rs remain submerg ed I
i-:l
a le flovvers are relea sed on to the surface of water EI n d rh x2
t7 rried by water curents to the surface of stigma /
3
ribbon like pollen g rai n I
are not colourfull /
uce ( two nts
{i) Vallisneria 1
b
(ii) Seagrasses / Zostera 1

R I Polyrnerdse cha I n reaction Can detect the pathogen
low concentration Diseases ca n be detected by the
m tion of thelr n acid
LISA / Enzyme linked immuno sorbant assay - Based on
- antibody interaction. lnfection by pathogen can
detected by the presence of antigen or antibody
EI ed inst the 1x3 3
diography / radio active probe - Probe is allowed to
ise with a mutated g ene, the m uta ted 9ene wil not
r in photograph I c Rlrl lm a nd s detected by
uto rad
binan t E NA tech nology / rDNA technology
three
FI
L. l
i) Stirred tank bioreactor. I
ii) Sparged stirred-tank bioreactor I
ta n k bioreactor conti n uous stirring makes the med ium
the biorea ctor combi ne and to provi de oxygen
m stirred tank bioreactor - sterile air is bubbled through 3
E cultu re medium. Bubbles in the medium increases the rA x2
rface area for oxygen transfer into the culture vesset.

ny related to bioreactor give L score))
ake

F]
1
hopper

m rass
3
tt Because the biomass of fishes far exceeds that of
phytoplanktons 1

does not ta ke into account the sarne species belong to two or
c trophic evels I Does not accommodate a food web I
1
or decomposers are not considered I n any ecological
I are based on food chain

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