Kerala Plus Two Answer Key 2025 Zoology

AI\SWER KEY sY - 426
SECOND YEAR HIGTTER SECONDARY EXAMINATION MARCH 2025

PART - III SUBJECT : ZOOLOGY
30 SCORES 1 HOURS

Qn Sub Answer Key/ Value Points Score Total
No Qns Score
I Answer any 3 questions from 1to S.Each carries 1 score

1. Saheli 1 1.

2. Allergy 1 1

3. a Ovary 1.t2
b Progesterone 1.t2 1

4. 30 1. L

5. Haemophilia 1 I
II Answer any 9 questions from 6 to 16. Each carries 2 scores.
6. a No. U2
It is an STD / It is transmitted through -
. Sexual contact with infected person
. By transfusion of contaminated blood and blood products
. B), sharing infected needles /by sharing infected needles as U2
in the case of intravenous drug abusers
. From infected mother to her child through placenta. 2
or (Any relevant answer) (Any I Point)
b Enzyme linked immunosorbent assay / ELISA 1t2

c . Avoid sex with unknown partners / multiple partners
. Use condom during coitus
. Making blood (from blood banks) safe from HIV
. Ensuring the use of disposable needles and syringes in Lt2
hospitals and clinics
. Free distribution of condoms
. Controlling drug abuse
. In case of doubt consult a qualified doctor.
or (Any relevant answer) (Any 1 Point)
a Lactic acid 1.t2
7 b Biocontrol 1.t2
c Citric acid U2 2
d Clostridiun butylicum Lt2
a Lactose 1
B. b O - Operator Lt2 2
P - Promoter 1t2
9. A-Ramapithecus 7t2
B-Homo habilis 7t2 2
C-Homo el'ectus 1t2
D-Homo sapiens 1t2
1t3

\

10 a UAA,UGA,UAG ll2x4 2
b AUG
11 a ZIFT-Zy gote Intra Fallopian Transfer 1
b ICSI-Intra Cytoplasmic Sperm Injection 1 2
12 ColumnA Column B
Physical barrier Skin y2
Physiological barrier Saliva in mouth u2 2
Cellular barrier Neutrophil U2
Cytokine barrier Interferon y2
13 a Mating 1./2
b Consanguineous mating / Mating benveen relatives Lt2
c Affected female /Affected individual Lt2 2
d Male 1.t2

T4 a Fimbriae U2
b Isthmus Lt2 2
c Infundibulum 1.t2
d Ampulla / Ampullary isthmic junction U2
15 a Incomplete dominance 1 2
b L:2:1. 1

16 a Hardy Weinberg principle 1t2
b . Gene migration or gene flow 2
. Genetic drift u2
. Mutation U2
. Geneticrecombination Lt2
. Natural selection (Any 3 )
III Answer any 3 questions from 17 to 20. Each carries 3 scores
T7 a A- Cu T / Copper T 1
B- Vasectomy 1
b Yes. r/2 3
To avoid female foeticides. / Any relevant answer. u2
1B a Hershey-Chase experiment 1
b To determine/prove that DNA is the genetic material / protein is u2
not the genetic material. 3
c A-Infection 1./2
B-BIending 1./2
C-Centrifugation U2
19 a . Habitat loss and fragmentation U2
. Over-exploitation lt2
. Alien species invasion 1.t2
. Co-extinction U2 3

b a
In-situ conservation / On- site 1.t2
Ex-situ conservation / Off - site Lt2

20 a Male heterogamety is a condition where males produce
two different types of sex chromosomes / gametes /sperm. 1.

2t3

!t

b XX -XY mechanism / Diagrammatic representation/Explanation I
related to it.
3
C Egg. 1.t2
Females are heterogametic / produce two types of eggs /Females
have ZW chromosomes, while males have ZZ chromosomes . U2

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