Plus Two Zoology Model Question Paper 5

Kerala Plus Two Zoology Model Question Paper 5

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

Answer all the following questions. Each carries 1 score.

Question 1.
Name the person who studied the species-area relationship.

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

Question 3.
Note the relationship between the first pair and complete the second pair.
Natural selection: Darwin; Inheritance of ac­quired characters:………………..

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

Question 4.
Complete the table using suitable terms

Question 5.
To find out the unknown genotype of a vio­let flowered pea plant a researcher did the following cross. Observe the diagram and answer the following questions:
(Hint: Violet flower color in pea plant is dominant over white)

a. What would be the above cross called?
b. Can you determine the unknown geno­type of a violet flowered parent by drawing punnet square?

Question 6.
Diagram of a double-stranded polynucleotide chain is shown below:

What do the numbers I, II, III and IV indi­cates?

Question 7.
In which part of the human reproductive system the following events occur?
1. Fertilisation
2. Implantation

Question 8.
Explain transcription. A transcription unit in DNA is defined primarily by three re­gions. Write the names of any two re­gions.

Question 9.

The above-shown pictures are beaks of a particular type of bird seen on an island during Darwin’s journey.
a. Identify the bird and name the island.
b. Write the significance of this process in evolution.

Question 10.
Microbes can also be used as a source of energy. Substantiate with suitable ex­amples.

Question 11.
Classify the diseases given in the box as two groups based on their causative organisms. Specify the type of causative organism for each group.
Typhoid, Malaria, Pneumonia, Diphtheria, Amoebiasis.

Question 12.
Most often HIV infection occurs due to con­scious behavior patterns. Do you agree with this statement? Substantiate your an­swer.

Question 13.
Given below is the figure showing func­tioning of the lac operon in presence of lac­tose. Redraw the figure and label the parts numbered 1 to 6.

Question 14.
Nature has many varieties of plants which give drugs for abuse, as there are medici­nal plants which give medicines. Substan­tiate with two examples.


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

Question 15.
“Prediction of the sequence of amino ac­ids from the nucleotide sequence in mRNA is very easy, but the exact prediction of the nucleotide sequence in mRNA from the sequence of amino acids coded by mRNA is difficult.”
a. Which properties of the genetic code is the reason for the above condition? Ex­plain.
b. Which are the stop codons in DNA repli­cation?

Question 16.
A transcriptional unit is given below. Observe it and answer the questions.

1. How can you identify the coding strand?
2. Write the sequence of RNA formed from this unit?
3. What would happen if both strands of the DNA act as templates for transcription?

Question 17.
A poultry farm manager was cursing his hens for producing lion share of cocks in its prog­eny. Hearing this, Kumar – farm attender.starts to blame his wife for delivering con­secutive girl children. Analyze the situations scientifically and state whether you agree with Kumar.

Question 18.
The diagram represents the process of gametogenesis. Closely observe it and an­swer the following.

a. Is it spermatogenesis or oogenesis?
b. What does the smaller shaded circles rep­resent?
c. Write down two significance of produc­tion of the same.

Answers

Answer 1.
Alexander von Humboldt

Answer 2.
Trp

Answer 3.
Lamark

Answer 4.

Answer 5.
a. Test cross

The unknown genotype of Violet flowered par­ent is WW.

Answer 6.
I – Phosphorus/P
II- Pentose Sugar
III – Thymine/T
IV – Cytosine/C

Answer 7.
a
1. Fertilisation takes place in the ampulla of the fallopian tube,
2. Endometrium,
b.
A – Trophoblast
B – Inner cell mass

Answer 8.
The process of copying genetic information from one strand of the DNA into RNA is termed as transcription. The strands are transcripted 1. If both strands act as a tem­plate, they would code for RNA molecule with different sequences and in turn, if the code for proteins, the sequence of amino acids in the proteins would be different. A transcription unit in DNA is defined pri­marily by the three regions in the DNA:

1. a promoter
2. the structural gene
3. a terminator

Answer 9.
The bird is Darwin’s Finches. The name of Island is Galapagos Island, b. Darwin finches differed primarily in body size and beak shape as an adaptation to types of food available on islands. All these species evolved in different directions from the common ancestral form and adapted to new invaded habits and to modes of life necessary there. This phenomenon is called an adaptive radiation.

Answer 10.
The microbes can also be used as a source of energy. Very nice example of this is the production of biogas from the dung of cattle in the gobar gas plants by the microbes called methanogens.

Answer 11.
Bacterial diseases: Typhoid, pneumonia, diphtheria.
Protozoan diseases: Amoebiasis, malaria.

Answer 12.
Yes. The HIV infection is mainly by blood transfusion may take place due to poor monitoring.
Use of condoms during sexual contact will prevent from getting HIV. So alertness about infection of HIV will protect us from. getting AIDS.

Answer 13.

Answer 14.
Ganja – from female inflorescence of the can­nabis plant.
Bhang- dried leaves, stems and flowering shoots of Cannabis plant.
Cannabis sativa plant produces Gannab- inside of which is used as medicine in Ayurveda and Unani. Morphine from a poppy plant used as a painkiller.

Answer 15.
Degeneracy of specificity. Some amino acids are coded by more than one codon, hence the code is degenerate.
b. UAA, UAG, UGA.

Answer 16.
a.  The strand with polarity 5¹-3¹ called cod­ing strand.
b. UCAGUACA
c.
1. If both strands act as a template, they would code for RNA molecule with dif­ferent sequences.
2. If the code for proteins, different amino acids will be formed. So more com­plications.
3. If two RNA molecule produced at the same time they would be complementary to each other would form double-stranded RNA. So translation affected.

Answer 17.
I cannot agree with Kumar because of the sex of progeny is not determined by parents but by chance by which the combining of gametes produced by parents. In birds, sex determination mechanism is as follows.

Answer 18.
a. Oogenesis.
b. Polar bodies
c. Polar body formed help to concentrate more cytoplasm in the ovum. It also helps to reduce the chromosome number into half in the egg.

Plus Two Zoology Previous Year Question Papers and Answers