Saturday, October 24, 2020

2018 March | HSE +2 Exam | Zoology Question Paper

PART B ZOOLOGY (2018 March)

 
I. Answer all questions from 1-3. Each question carries 1 Score. (Scores: 3 x 1 = 3)

1. Name the cells in testes which synthesize and secrete the androgens.

2. Different contraceptive methods are given below. Pick out the odd one.

(a) Cu T 
(b) Saheli
(c) Multiload 375 
(d) Lippes loop

3. Expressed sequences in the gene are called

(a) Introns 
(b) Mutons
(c) Exons 
(d) Cistrons

II. Answer any nine questions from 4-14. Each question carries 2 Scores. (Scores: 9 x 2 = 18)

4. ln a classroom discussion, a student said that the sex of the baby is determined by father. Analyse the statement and give reason for it.

5. Different contraceptive methods are used to control population explosion. Summarise the natural method and barrier method of contraception.

6. DNA is tightly packed structure and is found as units called nucleosomes.

(a) Explain the concept of nucleosomes.
(b) Differentiate between euchromatin and heterochromatin.

7.

(a) Observe the above cross and name the phenomenon.
(b) Write down the theoretically given explanations of the phenomenon.

8. Complete the boxes with the suitable words given below:
[Analogues, Homologues, Convergent evolution, Divergent evolution]


9. Explain the factors affecting the Hardy-Weinberg equilibrium.

10. Innate immunity is a non-specific type of defense and consists of four types of barriers. Categorize the barriers and give one example for each.

11. Complete the table given below: 

Column-I

Column-II

Column-III

Typhoid

……..A……

Stomach pain, intestinal perforation

………B……..

Rhinovirus

Sore throat, hoarseness

Malignant malaria

…….C………

Chill, high fever

………..D……..

Wuchereria

Chronic inflammation of lymph gland


12. Consumption of drug and alcohol affects the persons mental and physical health very badly. List the warning signs of alcohol or drug abuse.

13. Identify the disadvantages of RNA over DNA as a genetic material and explain it.

14. Complete the table with appropriate terms: 

Organism

Scientific name

Bioactive product

Fungus

……..A…….

Citric acid

…..B…..

Acetobacter aceti

Acetic acid

Fungus

Trichoderma polysporum

……C…….

Yeast

……..D……..

stain


III. Answer any three from 15-18 questions. Each question carries 3 Scores. (scores: 3 x 3= 9)

15. Observe the graph and answer the following questions: 


(a) Name S, A, Z and C in the graph.
(b) Name the scientists who explained Species-Area relationship.

16. (a) In lac Operon lactose act as inducer molecule. Evaluate the statement and explain it.

      (b) Observe the diagram of lac Operon and identify labelled parts A, B, C and D. 


17. Sexually transmitted disease (STD) are mainly transmitted through sexual contact.

(a) Name any two examples of sexually transmitted disease.
(b) Explain any two methods adopted to prevent STDs.

18. Hemophilia, Sickle cell anemia and Phenyl Ketonuria are Mendelian disorders.

(a) What do you mean by Mendelian disorder?
(b) Which one of the above is an example of inborn error of metabolism? Mention the cause of the disorder.

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