Kerala Plus Two Zoology Question Paper March 2022 with Answers

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

Kerala Plus Two Zoology Question Paper March 2022 with Answers

A. Answer any three questions from 1 to 4. Each carries 1 score. (3 × 1 = 3)

Question 1.
Homologous organ: Divergent evolution:: Analogous organ:
Answer:
Convergent evolution

Question 2.
Expand the term ZlFT.
Answer:
Zygote Intra Fallopian Transfer

Question 3.
Mitotic division of zfgote results in the formation of blastomeres is called
Answer:
Cleavage

Question 4.
Name the enzyme that joins the DNA fragments in dis-contthuous strand during replication.
Answer:
DNA Ligase

B. Answer all questions from 5 to 6. Each carries 1 score.

Question 5.
The term ‘Biodiversity’ was popularised by the scientist ______
Answer:
Edward Wilson

Question 6.
The first antibiotic discovered was ______
Answer:
Penicillin

Part-II

A. Answer any two questions from 7 to 9. Each carries 2 scores.

Question 7.
‘Codon AUG is known as initiator codon.
(a) Name the amino acid coded by AUG.
(b) Write any two stop codons
Answer:
(a) Methionine
(b) U, UAG

Question 8.
Write the functions of the following
(a) Leydig cells
(b) Corpus luteum
Answer:
(a) Secrete testicular hormones called androgens or Testosterone.
(b) Secretes progesterone

Question 9.
Match the following:

(A)	(B)
i) Trtchoderma	a. Citric acid
ii) Monascus purpureus	b. Ethanol
iii) Saccharomyces cerevisiae	c. Cyclosponn A
iv) Aspergillus niger	d. Statin

Answer:

A	B
Trichoderma polysporum	a. Cyclosporin A
Monascus purpureus	b. Statin
Sacoharomyces cervisiae	c. Ethanol
Aspergillus niger	d. Citric acid

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

Question 10.
Choose the correct terms from the bracket to fill in the blanks and complete the table: (Bigbang theory, Miller’s experiment, Lamarkism, Darwinism)

(A)	(B)
i) Natural selection	a ____
ii) Chemical evolution	b ____
iii) Origin of Universe	c ____
iv) Use and Disuse of organs	d ____

Answer:

(A)	(B)
i) Natural selection	Darwinism
ii) Chemical evolution	Miller’s experiment
iii) Origin of Universe	Bigbang theory
iv) Use and Disuse of organs	Lamarkism

Question 11.
Write any four ill-effects of Drug/Alcohol abuse.
Answer:

1. Causes heart failure and hypertension.
2. Use of alcohol causes stomach ulcer and pancreatitis.
3. Causes lack of interest in personal hygiene,solation, depression , aggressiveness etc.
4. Causes deteriorating relationship with famil y and friends change in eating and sleeping habit etc.

Question 12.
(a) Name the cap-like structure present in sperm head.
(b) Write its function.
Answer:
(a) Acrosome

(b) Acrosome is filled with lytic enzyme that helps in the penetration of sperm in wall iayers of ovum  that leads to fertilisation

Question 13.
(a) Distinguish between Male heterogamety and Female heterogamey.
(b) Write one example for each.
Answer:

Male heterogamety	Female heterogamery
Here males are heterozygous (XY/XO)	Here females are heterozygous (ZW)
Mates produce two types of gamete	Females produce two types of gamete
Type of male gamete/sperm will determine the sex of the progeny	The type of female gamete/egg will determine the sex of the baby
This type of mechanism seen in	This type of mechanism seen in
. Human male	. Birds
. Grass hopper

(b) Male heterogamety – Different type of chromo some constitution in Male.
Eg :- Human or Drosophila
Female heterogamety -Different type of chromo some constitution in female
Eg :- Birds

Part – III

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

Question 14.
“Allele frequencies in a population are stable and is constant from generation to generation.”
(a) Name the principle
(b) Mention any four factors those affect this principle.
Answer:
(a) Hardy Weinberg Principle
(b) Gene flow mutation genetic recombination natural selection

Question 15.
“Sex of a child is determined by father”. Substantiate the statement.
(b) Name any four STDs.
Answer:
In human, the male produce two types of gametes i.e. one with X chromosome and other with Y chromosome. During fertilisation, Sperm with X chromosome fuses with egg to produce female child while sperm with Y chromosome fuses with eg to produce male child.

Question 16.
incidents of STDs are very high among the age group of 15-24 years.
(a) What is STD?
(b) Name any four STDs.
Answer:
(a) Sexually Transmitted Diseases
(b) Gonorrhoea, syphilis, genital herpes, hepatitis B,& AIDS

Question 17.
(a) Write four major causes of Biodiversity loss.
(b) Give one example for in-situ conservation and ex-situ conservation of Biodiversity.
Answer:
(a)

1. Habitat loss and fragmentation
2. Over-exploitation,
3. Alien species invasions
4. Co-extinctions

(b) In situ conservation
Eg :- Biosphere Reserves or National Park
Ex situ Conservation
Eg :- Botanical Gardens or Zoological Park

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

Question 18.
(a) Expand the term DNA. Who proposed double helical model of DNA?
(b) List out the nitrogen bases in DNA.
Answer:
(a) Deoxyribo Nucleic Acid James Watson & Francis Crick
(b) Adenine, Thyrnine, Guanine, Cytosine

Part – IV

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

Question 19.
(a) Expand thetermAlDS. Mention the name of virus that causes AIDS.
(b) Name the widely used diagnostic test for AIDS.
(c) List out any four practices for the prevention of AIDS.
Answer:
(a) Acquired Immuno Deficiency Syndrome

(b) ELISA Test

(c)

1. Use disposable syringe and needles.
2. Checking of blood before blood transfusion.
3. Use condom for male or female during intercourse.
4. Avoid intercourse with unknown partner.

Question 20.
Schematic diagram of a transcription unit is given below:

(a) Identify the pans A and B.
(b) What is transcription?
(c) Write the complementary DNA strand by observing the strand given below:
Answer:
(a) A – Promoter gene
B – Template strand

(b) It is the process of formation of mRNA from DNA

(c) 3 – TACGTACGTA-5