Kerala Plus Two Zoology Board Model Paper 2023 with Answers

Teachers recommend solving Kerala Syllabus Plus Two Zoology Previous Year Question Papers and Answers Pdf Model 2023 to improve time management during exams.

Kerala Plus Two Zoology Board Model Paper 2023 with Answers

I. Answer any 3 q uestions from 1 -5. Each carries 1 score. (3 × 1 = 3)

Question 1.
Write the part of fallopian tube where fertilization takes place in human beings.
Answer:
Aampullary-isthmic junction

Question 2.
Select the completely curable sexually transmitted infections (STIs) from the following:

Genital herpes SPphilis Chiamydiosis Hepatities-B

Answer:
Syphilis, Chlamydiasis

Question 3.
obserye the given figure showing global magnitude of biodiversity in vertebrates. Identify the group of animals labelled as A.

Answer:
Fishes

Question 4.
Expand:
(a)UTR
(b)VNTR
Answer:
(a) Untranslated Regions
(b) Variable Number of Tandem Repeats

Question 5.
Identify the first word pair relationship and fill theblank with suitable word for second pair.
Answer:
Brain

II. Answer any 9 questions from 6-16. Each carries 2 scores.

Question 6.
(a) Define placenta.
(b) Write any 2 hormones secreted from placenta.
Answer:
(a) Structural and functional connection between embryo and maternal body is called placenta I Chorionic villi and uterine tissues together form the placenta.

(b)
1. Human chorionic gonadotropin
2. Human placental lactogen

Question 7.
Biodiversity loss is dangerous threat facing planet earth in present days. Write the four reasons of Biodiversity loss given as evil quartet.
Answer:

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

Question 8.
(a) Define homologous organs.
(b) Analogous structures are a result of the evolution.
Answer:
(a) Organs that has similar structure but having different function.
(b) Convergent evolution.

Question 9.
Name the microbes which produce the following bioactive molecules and write use of (a) and (b).
(a) Cyclosporin A
(b) Statin
Answer:
(a) Trchodenna polysporum.
Used as Immunosuppressive agent.

(b) Monescus purpureus,
Blood diolesterol lowering agents.

Question 10.
Complete the table by filling (A) and (B)

Birth Control Methods
Sterilisation	(B) ________
Vasectomy (A) _______	Multiload 375 Lipper’s Loop

Answer:
(A) – Tuboctomy
(B) – Non-medicated IUDs

Question 11.
Identify the given symbols of Pedegree.

Answer:
(a) MaleorUnaffected male
(b) Female or Unaffected female
(C) Mating
(d) Mating between relatives or consanguineous mating.

Question 12.
Observe the given figure and answer the following questions:

(a) Identify the given strucutre
(b) Name (A) and (B)
Answer:
(a) Nudeosorne
(b) (A)-DNA
(B) Histone octamer

Question 13.
Complete the given representation:

Answer:
(A) Skin
(B) Physiological Barrier
(C) PMNL – neutrophils or Monocytes
(D) Cytokine Barriers.

Question 14.
(a) A man with blood group ‘AB marries a woman with blood group ‘O’. Write the possible genotes of blood grotipsAB and O.
(b) Write the possible genotypes of their offsprings by suing Punnet Square.
Answer:
(a) AB blood group genotpe – \(\|\left.^A\right|^B\)
O blood group genotype – ii

Question 15.

Scientists	Contribution
George Gamow	DNA finger-printing
Alec Jeifreys	Chargaff Rule
Frederick Griffith	Genetic Code
Taylor and Colleagues	Transformation experiment
	DNA replication

Answer:

Scientists	Contribution
George Gamow	Genetic Code
Alec Jeifreys	DNA finger-printing
Frederick Griffith	Transformation experiment
Taylor and Colleagues	DNA replication

Question 16.
Using the given terms in brackets complete the evolutionary stages of man. (homo habilis, Ramapithecus, Homo erectus, Neanderthal man)

Answer:
(A) Ramapithecus
(B) Homo erectus
(C) Neanderthal man
(D) Homo sapiens (Not given in question)

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

Question 17.
Observe the given figures A and B. Answer the following questions:

(a) Name the embryoñic stages in figure A and B.
(b) In figure B outertayer is trophoblast, and inner group of cells attached to trophoblast is ___
(C) Define implantation.
Answer:
(a) A – Morula
B – Blastocyst
(b) Inner cell mass
(c) Blastocyst embedded in the endometrium of the uterus is called implantation.

Question 18.
Answer the following questions:
(a) Complete the given representation.

(b) Categorie the following bases into Purines and Pyrimidines:
Adenine, Cytosine, Uracil, Guanine
(c) DNA is made up of two polynucleotide chains where back bone is constituted by ______ and bases project inside.
Answer:
(a) (A) – Transcription
(B) Translation
(b) Purines – Adenine and Guanine. Pyrimidines – Uraail & Cytosine.
(c) Sugar – phosphate.

Question 19.
(a) Cancer causing agents are called ____
(b) Differentiate between benign tumour and malignant tumour.
(c) Write any two methods to detect cancer of the internal organs.
Answer:
(a) Carcinogens.

(b) Benign Tumors:
The cancer, which are localized to a particular tissue, are called benign tumor. They cause little damage.

Malignant Tumors:
Mali gnant tumors consist of mass of proliferative cells. The cells can invade to other tissues

(c) (i) Radiography
(ii) MRI (magnetic resonance imaging).

Question 20.
Observe the figures given in (A), (B) and (C) and answer the questions.
(a) Identify and write the genetic disorder in (A), (B) and (C).
(b) Write any three Mendalian disorders.

Answer:
(a) (A) Down’s Syndrome
(B) Klinefelter’s Syndrome
(C) Turner’s Syndrome
(b) Haemophilia, Sickle-cell anaemia, Phenylketonuna,