Plus Two Zoology Model Question Paper 2

Kerala Plus Two Zoology Model Question Paper 2

Time: 1 Hour
Cool off time: 10 Minutes
Maximum: 30 Score

Answer all the following questions. Each carries 1 score.

Question 1.
Study the relationship between the first two terms and fill the blank space with a suitable word
Androgen – Leydig’s
cells

Question 2.
Pick the odd one out of the given amino acids.

Question 3.
Which theory talks about the huge explo¬sion that leads to the origin of the universe.

Answer any nine questions from 4 – 14. Each car­ries 2 scores.

Question 4.
Theory of chemical evolution is a version of the theory of abiogenesis. Analyze the state­ment.

Question 5.
Some bioactive molecules, their source, and their medical importance are given in the table below. Fill up the missing parts.

Question 6.
a. Arrange the given chemical compounds in the sequential order as per the con­cept of origin of life.             (Ammonia, Hydrogen, Protein, Nucleic acid, Amino acid)
b. Correlate Miller’s experiment with this.

Question 7.
Lakshmi and Sujitha are two nursery stu­dents. Sujitha gets common cold very of­ten. Lakshmi not.
a. How do you interpret this in an immuno­logical aspects?
b. What are the common barriers protect­ing Lakshmi from the cold?

Question 8.
Given below is the diagrammatic represen­tation of the human blastocyst. Observe the diagram and answer the following questions.

a. Identify A and B.
b. Write the functions of A and B.

Question 9.
Arrange the following in a hierarchical man­ner based on the period of their evolu­tion. Homoerectus, Ramapithecus, Austral opithecus, Homosapiens, Neanderthal man.

Question 10.
“More and more children in metro cities in India suffer from allergies and asthma.”
a. Do you agree with this statement?
b. Justify your answer.

Question 11.
a. A couple has two daughters. The blood group of husband and wife is ‘O’.
What is the possible blood groups the children should have?
b. Whether any change in blood group will occur if they have two sons instead of daughters.
Substantiate your answer.

Question 12.
A bacterial infection was effectively con­trolled by using a specific antibiotic for a long time. But nowadays this antibiotic is not found to be so effective to control the said infection.
Give a scientific explanation for this phe­nomenon based on evolution.

Question 13.
Make pairs by putting the related items together stating their relationship.

• Monascus Purpureus
• Trichoderma polysporum
• Ethanol
• Blood clot
• Streptokinase
• Statin
• Saccharomyces cerevisiae
• Cyclosporin

Question 14.
Identify the given structure.
Give its role in protein synthesis.

Answer any three from 15-18 questions. Each carries 3 scores.

Question 15.
Some stages of the embryonic develop­ment are given below. Observe these dia­grams and answer the questions.

a. What is A & B?
b. Name the two types of cells found in the blastocyst.
c. Which layer of the blastocyst is attached to the endometrium? And name the process

Question 16.
“STDs present a major health concern in both industrialized and developing countries.”
a. What do you mean by STDs?
b.Name two STDs.
c. Suggest two preventive measures.

Question 17.

The above graph shows the level of ova­rian hormones in a normally menstruat­ing woman during the follicular phase.
a. Name ‘a’ and ‘b ‘
b. Mention the role of pituitary hormones in maintaining this condition.
c. Reconstruct the graph for Luteal phase.

Question 18.
The year 2010 has been declared as the International Biodiversity Year by United Nations (UN).

1. Point out the levels of diversity in na­ture.
2. Give a brief description of ‘The Evil Quartet’.

Answers

Answer 1.
Placenta

Answer 2.
Met

Answer 3.
Big Bang theory

Answer 4.
The theory of chemical evolution says that small elements combined to form com­pounds which further form small molecules.

In theory of Abiogenesis living organisms formed from non-living substances that are small elements combined to form com­pounds which further forms small living molecules i.e., non-living substance com­bined to form large living molecules.

Answer 5.
a-Streptokinase
b- Trichoderma, polysporum
c – Immuno suppressant,
d – Statins.

Answer 6.
a. Hydrogen → Ammonia → Amino acid → Protein → Nucleic acid,
b. Miller and Urey in their experiment cre­ated a condition which was similar to that of the primitive earth. In this experiment, they created an electric discharge in a closed flask containing methane (CH₄), Hydro­gen (H₂), ammonia (NH₃) and water vapour at 800 °C. After one week, they analysed the chemical composition of the liquid inside the apparatus and found a large number of simple organic compounds including some amino acids.

Answer 7.
a. Low level of innate immunity to Sujitha.
b.
1. Physical barriers (skin, a mucous coating of epithelium lining the respiratory, gastrointestinal and urogenital tracts).
2. Physiological barriers (Acid in the mouth, saliva in mouth and enzyme, lysozyme found in tears from eye),
3. Cellular barriers (Leukocytes of our body like polymorpho-nuclear leukocytes (PMNL), monocytes, natural killer (a type of lymphocytes) in the blood and macrophages
4. Cytokine barriers (interferons).

Answer 8.
a. A – Inner cell mass B – Trophoblast
b. Trophoblast – Differentiates into extraembryonic membranes, eg., Amnion, Chorion etc.
Inner cell mass- Differentiates into an embryo.

Answer 9.

Answer 10.
a. Yes.
b. Overexposure to allergens or pollutants in the metro cities.

Answer 11.
a. O’ group.
b. No. There is no sex specificity in blood group alleles.

Answer 12.
Antibiotics were considered to be very ef­fective against disease-causing bacteria. But within a few years of continuous use of an­tibiotic, new antibiotic-resistant bacteria will appear in the bacterial population. Sometimes bacterial population happens to contain one or a few bacteria having mutations which make them resistant to the antibiotic. Such resistant bacteria survive and multiply quickly. Soon the resistance providing gene become widespread and entire bacterial population become antibiotic resistant. It is an example of evolution by anthropogenic

Answer 13.
Monascus Purpurreus- Stain
Trichoderma Polysporum – Cyclosporin
Saccharomyces cervisiae – Ethanol
Streptokinase – a Blood clot

Answer 14.
t-RNA
It carries amino acids to the site of protein syn­thesis. It can read and pair with codons of m- RNA during translation.

Answer 15.
a. A – Blastomere, B-Morula
b. Trophoblast and Inner cell mass.
c. Trophoblast. The process is called implan­tation.

Answer 16.
a. Sexually Transmitted Diseases
b. Syphilis, Gonorrhoea.
c. 1. Avoid sex with unknown partners.
2. Always use condoms during coitus.

Answer 17.
a – Oestrogen,
b – Progesterone.
b.
i.FSH: It influences the maturation of Graffian Follicles and the secretion of Oestrogen.
ii. LH: It stimulates ovulation, development of Corpus Luteum and secretion of progesterone.
c.

Answer 8.a.

1. Genetic level diversity
2. Species-level diversity
3. Ecosystem-level diversity

b.
1.Habitat loss and fragmentation: It is due to cutting down trees, ploughing a grass­land, filling a wetland or burning a forest. The fragmentation of forest due to hu­man activities also lead to loss of biodiversity.

2. Over exploitation: Biodiversity satisfies all human needs. But when the need turns to greed, it leads to the over ex­ploitation of nature and natural resources.

3. Alien species invasions: Introduction of alien species (exotic species) into a new habitat by man may adversely affect the indigenous (native) species.

4. Co-extinctions: When a species becomes extinct, the animal or plant associated with it also becomes extinct.

Plus Two Zoology Previous Year Question Papers and Answers