Kerala Plus Two Zoology Question Paper SAY 2019 with Answers

Teachers recommend solving Kerala Syllabus Plus Two Zoology Previous Year Question Papers and Answers Pdf SAY 2019 to improve time management during exams.

Kerala Plus Two Zoology Question Paper SAY 2019 with Answers

Answer all questions from 1 to 3. Each carries 1 Score. (3 × 1 = 3)

Question 1.
Find out the correct sequence:
a) Fertilisation – Zygote – Blastula – Morula – Cleavage – Implantation
b) Fertilisation – Zygote – Cleavage – Morula – Implantation – Blastula
c) Fertilisation – Zygote – Morula – Cleavage – Implantation – Blastula
d) Fertilisation – Zygote – Cleavage – Morula – Blastula – Implantation
Answer:
Fertilisation-Zygote – cleavage-Morula-blastula Implantation

Question 2.
Identify the following symbols in pedigree Analysis :

Answer:
a) Mating
b) Marriage between relatives

Question 3.
In a double strandard DNA, the ratios between Adenine and Thymine, Guanine and Cytosine are constant and equal one. Who observed this fact?
Answer:
Ervin Chargaff

Answer any 9 questions from 4-14. Each carries 2 Scores.

Question 4.
Observe the cross of a pure violet and white flower.

a) By using the F₁ progeny design a test cross.
b) Mention the significance of test cross.
Answer:

b) It helps to find out the unknown genotype of organism

Question 5.
‘Don’t die of ignorance.
a) About which it is mentioned?
b) List two measures taken by WHO to prevent it.
Answer:
a) HIV infection

b) 1. blood transfusion must be safe
2. use dispossible syringes and needles in public and private Hospitals

Question 6.
Match the following:

A	B
a) Citric Acid	i) Acetobactor aceti
b) Acetic Acid	ii) Clostridium butylicum
c) Lactic acid	iii) Aspergillus niger
d) Butyric Acid	iv) Lacto bacillus
	v) Trycoderma polysporum
	vi) Saccharomyces cervisiae

Answer:

A	B
a) Citric Acid	Aspergillus niger
b) Acetic Acid	Acetobacter aceti
c) Lactic acid	Lactobacil lus
d) Butyric Acid	Clostridium butylicum

Question 7.
Each symptom of two chromosomal disorders are given below:
Gynaecomastia Rudimentary ovary and lack of secondary sexual characters.
Answer:
Gynaecomastia- Kilnefelter’s syndrome Rudimentary ovary and lack of secondary sexual characters – Turner’s Syndrome

Question 8.
Observe the diagram of a double stranded DNAstrand:

Identify the bonds A, B, C & D A, B, C, D
Answer:
A – Hydrogen bond
B – phospho esterbond
C – phospho di esterbond
D – Glycosidic bond

Question 9.
‘LH Surge’ induces the rupture of Graafian follicle.
a) Which gland produces LH and in which day LH Surge happens?
b) Write the role of LH in males.
Answer:
a) Pituitary gland, 14th day

b) LH acts at the Leydig cells and stimulates synthesis and secretion of androgens

Question 10.
Bio-fertilisers are organisms that enrich the nutrient quality of the soil. How these biofertilisers enrich the soil nutrients? Give two examples.
Answer:
a) Microbes can fix atmospheric N₂
Eg. Azospirillum and Azotobacter

Question 11.
Based on evolution in the geological period arrange the plants and animals in the correct order in various million years ago. Choose the appropriate organisms from the bracket.
a) 500 m ya :
b) 350 m ya :
c) 320 m ya :
d) 200 m‘ya :
Answer:
a) 500 mya – Invertebrates
b) 35Omya – jawless fish
c) 320m ya – sea weeds
d) 200mya – Reptiles

Question 12.
The following diagram shows a process in the Ribosome:

Identify the process and explain.
Answer:
Translation step of protein synthesis During this process, ribosome moves from codon to codon along the mRNA and the amino acids are joined by peptide bond i.e polymerisation of amino acids to form a polypeptide.

Question 13.
Make a flow chart using the following terms :
[Natural selection, Struggle for existence, Variation, Origin of species, Over production, Survival of the fittest]
Answer:

Question 14.
Observe the figure and answer the following questions:

a) Identify the given molecule.
b) Mention two types of immune respones in human body.
Answer:
a) Antibody or Immunoglobulin
b) Humoral immune response Cell mediated immunity

Answer any 3 Questions from 15 to 18. Each carries 3 scores. (3 × 3 = 9)

Question 15.
Write the effect of the following drugs in human body:
a) Ophiods
b) Cannabinoids
c) Coca alkaloids
Answer:
a) Ophioids – Effect on central nervous system
b) Can nabinoids – Effect on brain or cardiovascular system of body
c) coca alkaloids – It has a stimulating action on central nervous system, producing a sense of euphoria and increased energy

Question 16.
There are several method of in vitro fertilisation to assist couples who lack the ability of fertilisation.
a) Give the popular name of the programme.
b) Suggest two techniques of in vitro fertilisation and their conditions of transfer to assist these people.
Answer:
a) Assisted reproductive technologies

b) ZIFT : zygote intra fallopian transfer: The zygote or early embryos upto 8 blastomeres transferred into the fallopian tube

GIFT : gamete intra fallopian transfer: Transfer of an ovum collected from a donor into the fallopian tube of another female who cannot produce one, but provide suitable environment for fertilisation and further development

Question 17.
In your school the Science Club decided to conduct a seminar about “Biodiversity conservation – Approaches.” You are invited to present a paper on this seminar. List out the main points you include d in the presentation. [Hint: In Situ, Ex-Situ conservation]
Answer:
In situ conservation – Organisms are protected in their natural habitat Eg. sacred groves, biosphere reserves, national parks and sanctuaries. Ex situ conservation – It is the conservation of threatened animals and plants outside their natural habitat. Examples are Zoological parks, botanical gardens and wildlife safari parks.

Question 18.
Transcription of eukaryotes are more complicated than that of prokaryotes. Explain any two additional complexities found in the transcription of eukaryotes.
Answer:
Three types of RNA polymerases in eukaryotes RNA processing Three important steps are involved – Splicing, capping, Tailing

1. In splicing the introns are removed and exons are joined toether.
2. In capping an methyl guanosine triphosphate is added to the 5’-end of hnRNA.
3. In tailing, adenylate residues are added at 3-end in a template.