Kerala Plus Two Zoology Board Model Paper 2022 with Answers

Teachers recommend solving Kerala Syllabus Plus Two Zoology Previous Year Question Papers and Answers Pdf Model 2022 to improve time management during exams.

Kerala Plus Two Zoology Board Model Paper 2022 with Answers

Part – I

A. Answer any three questions from 1 to 4. Each carries 1 score.

Question 1.
Mention any one of the factors that affects Hardy Weinberg equilibrium.
Answer:
Gene migration

Question 2.
Embryo with 8-16 Blastomeres is called
Answer:
Morula

Question 3.
Expand SNPs
Answer:
Single nucleotide polymorphism

Question 4.
State the term indicating the ceasing of menstrual cycle.
Answer:
Menopause

B. Answer all questions from 5 to 6. Each carries 1 score. (2 × 1 = 2)

Question 5.
The World Summit on Systainable Development was held in 2002 in _______ South Africa.
Answer:
Johannesburg

Question 6.
The first antibiotic discovered was
Answer:
Penicillin

Part-II

A. Answer any two questions from 7 to 9. Each carries 2 scores. (2 × 2 = 4)

Question 7.
Write any four characteristic features of individual inflicted with Down’s syndrome.
Answer:

1. Short statured
2. Small round head,
3. Furrowed tongue,
4. Partially open mouth

Question 8.
Fungi forms symbiotic associations with plants. What advantages the plant derives from this association?
Answer:

1. This associations helps to absorbs phosphorus from soil:
2. Resistance to root-borne pathogens,
3. Tolerance to salinity and drought,
4. Overall increase in plant growth and development

Question 9.
Complete the table with appropriate terms.

Name of Disease	Causative Organism	Type of Pathogen
Typhoid	A	Bacteria
B	Plasmodium	Protozoa
Ringworm	Microsporum	C
Ascariasis	D	Helminth

Answer:
A – Salmonella typhi
B – Malaria
C – Fungi
D – Ascaris

Answer any two questions from 10 to 13. Each carries 2 scores. (2 × 2 = 4)

Question 10.
Differentiate active immunity and passive immunity.
Answer:

Active Immunity	Passive Immunity
When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins, antibodies are produced in the host body Active immunity is slow and takes time to give its full effective response.	When ready-made antibodies are directly given to protect the body against foreign agents, it is called passive immunity Passive immunity is quick and takes short time to give its full effective response.

Question 11.
(a) Name the theory of origin of life proposed by Oparin and Haldane.
(b) Who experimentally proved theory?
Answer:
a) Chemical evolution
b) S.L. Miller

Question 12.
Complete the pathway of milk secreted from the alveoli of mammary glands.

Answer:
a) Mammarytubule
b) Mammary duct

Question 13.
Describe test cross and mention its significance.
Answer:
a) Itis the crossing of a Fi progenywith its recessive parent.
b) It is used to find unknown genotype of an individual

Part – III

A. Answer any three questions from 14 to 17. Each carries 3 scors. (3 × 3 = 9)

Question 14.
‘Prevention is better than cure’. What are the measures useful for prevention and control of alcohol and drugs abuse among adolescents? (any three measures)
Answer:

1. Avoid undue peer pressure
2. Education and counselling
3. Seeking help from parents and peers.

Question 15.
Pedigree study provides a strong tool in human ‘ genetics to trace the inheritance of a specific trait.
Define Pedigree analysis and identify the following symbols used in Pedigree analysis:

Answer:
Pedigree analysis Analysis of trait in a several generations of a family is called pedigree analysis.

1. Mating between relatives (consanguineous mating)
2. Sex unspecified
3. Female
4. Mating

Question 16.
The graph showing species area relationship is given.

(b) How is species richness related to area?
(c) What is the range of ‘Z’ value?
Answer:
a)  Z = slope of the line (regression coefficient)
C = Y – intercept

b) Within a region species richness increased with increasing explored area, but only up to a limit

c) 0.1 to 0.2

Question 17.
Distinguish homologous organs and analogous organs with one example for each and mention the type of evolution that led to the formation of homologous and analogous organs.
Answer:

Homologous organs	Analogous organs
Homologus organs are organs having same structure and origin but different functions.	Analogous Organs having same function but different structure and origin
Eg: whales, bats,Cheetah and human share similarities in the pattern of bones of forelimbs	Eg: Wings of butterfly and of birds
Homologus organs are developed due to divergent evolution.	Analogous are deve-loped due to Con-vergent evolution

B. Answer the following questions. Carries 3 scores. (1 × 3 = 3)

Question 18.
In Eukaryotes the heterogenous nuclear RNA (hnRNA) is a precursor of mRNA’. Explain the steps involved in the processing of hnRNA.
Answer:
The Heterogenous nuclear RNA (HnRNA) contain both the exons and the introns and are non-functional.
Hence, it is subjected to a processing.

Splicing : Here the introns are removed and exons are joined

Capping : In capping an unusual nucleotide (rnethyi guanosine triphosphate) is added to the 5’-end of
hnRNA..

Tailing : In tailing, adenylate residues (200-300) are added at 3’-end of a template strand

Part – IV

Answer any one question from 19 to 20. Carries 5 scores. (1 × 5 = 5)

Question 19.
(a) What is the central dogma in molecular biology and name any two processes involved in it?
(b) “In Eukaryotes, gene expression can be regulated at several levels.” Which are they?
Answer:
(a) Central Dogma in molecular biology is the unidirectional flow of information from DNA-RNA- Protein Processes in central Dogma in molecular biology

1. DNA Transcription
2. DNA Translation

(b) Regulation of gene expression in Eukaryotes

1. Transcriptional level (formation of primary transcript),
2. Translational level

Question 20.
Diagrammatic sectional view of the female reproducitve system is given below.
(a) Identify the parts labelled as A, B, C and D.
(b) Mention the surgical contraceptive methods in male and female and name the part which is cut or tied up in each method.

(a) Identify the parts labelled as A, B, C and D.
(b) Mention the surgical contraceptive methods in male and female and name the part which is cut or tied up in each method.
Answer:
(a) A – Ampulla
B – Ovary
C – Fimbriae
D – Cervical canal

b) Surgical contraceptive method in male : Vasectomy
The part which is cut or tied up in Vasectomy : Vas deferens
Surgical contraceptive method in male : Tubectomy.
The pat which is cut or tied up in Tubectomy : fallopian tube.