Kerala Plus Two Zoology Question Paper March 2020 with Answers

Teachers recommend solving Kerala Syllabus Plus Two Zoology Previous Year Question Papers and Answers Pdf March 2020 to improve time management during exams.

Kerala Plus Two Zoology Question Paper March 2020 with Answers

I. Answer any 3 questions from 1 – 5. Each carries 1 score. (3 × 1 = 3)

Question 1.
From the following, find out the symbol used in the human pedigree analysis representing male.

Answer:

Question 2.
Name the technique of transferring embryos upto 8 blastomeres into the fallopian tube.
a) GIFT
b) ZIFT
c) ICSI
d) IUI
Answer:
b) ZIFT

Question 3.
Microbe which help in the production of Biogas.
a) Aspergillus nicier
b) Trichoderma Polvsoorum
c) Saccharomyces derevisiae
d) Methanobacterium
Answer:
d) Methanobacterium

Question 4.
Which of the following human ancestor is more ‘ape’ like?
a) Homo habilis
b) Drypithecus
c) Australo pithecines
d) Homo erect us
Answer:
b) Drypithecus

Question 5.
Select the cause of etinction of Cichlid fish in lake Victoria of East Africa.
a) Habitat loss and fragmentation
b) Over-exploitation
c) Alien species invasions
d) Co-extinctions
Answer:
c) Alien species invasions

II. Answer any 9 questions from 6-16. Each carries 2 scores. (9 × 2 = 18)

Question 6.
Some examples of microbes in human welfare are given. Classify them under the heading given below.

Microbes in house hold products	Microbes as biofertil izers

Answer:

Microbes in house hold products	Microbes as biofertil izers
. Pmponibactonum sharmani	. Rhizobium
. Lactic acid bacteria	. Azospinllum
. Sacharomyces cervisiae	. Anabaena
	. Azotobacter
	. Aspergillus niger

Question 7.
Observe the figure given below showing Mendel’s experiment using pea plants.

a) Identify the’crossg!
b) Which are the laws proposed by Mendel based on this observations?
Answer:
a) Monohybrid cross

b) 1. Law of dominance
2. Law of segregaton or Law of purity of gametes

Question 8.
“All copulations lead to fertilization and pregnancy”. Do you agree with this statement? Justify your answer.
Answer:
No.
Fertlisaton can only occur if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.

Question 9.
Fill the blanks in Column A and B using appropriate terms.

Theory	Scientists
a) Theory of natural selection	A
b) Use and disuse of organs	B
c) Theory of mutation	C
d) Theory of spontaneous generation	D

Answer:

Theory	Scientists
a) Theory of natural selection	Charles Darwin
b) Use and disuse of organs	Jean Baptste de
c) Theory of mutation	La marck
d) Theory of spontaneous generation	Hugo deVries

Question 10.
One of the salient features of genetic code is “Universal”.
a) Write any other two salient features of Genetic code.
b) Which is the initiator codon? And name the amino acid it codes.
Answer:
a) 1. The codon is triplet
2. One codon codes for only one amino acid, hence, it is unambiguous and specific

b) AUG-Methionine

Question 11.
Amniocentesis for sex determination is legally banned now.
a) What is amniocentesis?
b) Why it is banned?
Answer:
a) It is the prenatal 1oetal sex determination test based on the chromosomal pattern in the amniotic fluid surrounding the developing embryo

b) It is banned for preventing female foeticides

Question 12.
Name any two protozoan diseases, its causative organism and any two symptoms.
Answer:
Malaria and Amoebiasis
Malaria : Pathogen : Plasmoidum vivax, P. malaria and P. falciparum Symptom: Chill and high fever recurring every three to four days

Amoebiasis: Pathogen: Entamoeba histolytica Symptom: constipation, abdominal pain and cramps

Question 13.
Tropical Amazonian rainforest in South America has the greatest biodiversity on earth. Do you agree with this? Explain.
Answer:
Yes

1. Temperate regions subjected to frequent glaciations in the past but the tropics undisturbed for millions of years, so in tropics evolution leads to species diversification.
2. Tropical environments are less seasonal, constant and predictable. Such constant envronments promote niche specialis.ation and lead to a greater species diversity
3. The availability more solar energy In the tropics causes higher productivity, so it leads to greater diversity.

Question 14.
Complete the illustration chart given below.

Answer:
a) Oploids
b) Central nervous system
C) Papayer somniferum
d) Cannabis sativa

Question 15.
Correct the following statements, if there is any mistake:
a) Haemophilia is an autosome linked recessive disease.
b) Turner’s syndrome is due to the presence of an additional copy of X chromosome.
Answer:
a) Haemophilia is a sex linked recessive disease
b) Turner’s sidrome is due to the absence one of the X chromosome

Question 16.
p² + 2pq + q² = 1 denotes an evolutionary principle.
p² + 2pq + q² = 1 agianto)”
a) Name the principle.
b) Mention any three factors affecting this.
Answer:
a) Hardy—Weinberg prindple

b) i) Gene migratiop
ii) Genetic drift
iii) Mutation

III. Answer any 3 questions from 17 – 20. Each carries 3 scores. (3 × 3 = 9)

Question 17.
Observe the figure given below:

a) Identify the process in the picture.
b) Name any two enzymes needed for this process,
c) Write the peculiarities of the newly synthesized daughter strands.
Answer:
b) Helicase and DNA ligase
c) Among the two newly synthesized strands,One strand is continuously produced and other strand is discontinuously produced.

Question 18.
Explain the measures useful for prevention and control of alcohol and drugs abuse among adolescents.
Answer:

1. Avoid undue peer pressure
2. Education and counseling
3. Seking help from parents and peers

Question 19.
The graph given below shows the level of the ovarian hormones in a normally menstruating woman during the follicular phase.

a) Name ‘A’ and ‘Bi.
b) Reconstruct the graph showing the level of hormones in luteal phase.
c) Name the hormone secreted by Corpus Luteum and mention its function.
Answer:
A – Progesterone

B – Estrogen

(c) Progesterone Function:
It support during pregnancy or it maintain Endometrium of uterus

Question 20.
A DNA sequences is provided below.
a) Write down the sequence of its complementary strand.
b) Name the enzyme involved in transcription of DNA.
c) What would happen if both the strands of the DNA act as templates for transcription?
Answer:
a) 3’-TACG TACG TACG TACG TACG TACG TA-5’

b) DNA dependent RNA polymerase

c) If both strand act as a template the following things will happen

1. Two RNA molecule will be produced with different sequences and results in the formation of 2 different protein.
2. Two RNA molecu’e will be produced, they are complementary to each other, hence ds RNA will not translate into protein.