Kerala Plus Two Zoology Model Question Paper 4
Time: 1 Hour
Cool off time: 10 Minutes
Maximum: 30 Score
Answer all the following questions. Each carries 1 score.
Question 1.
…………is a metabolic disorder that occurs due to the lack of an enzyme, that converts phenylalanine to tyrosine.
Question 2.
Study the relationship between the first two words and fill the blank space with a suitable word.
AIDS: ELISA
Thyphoid:………………..
Question 3.
The following statements compare the process of oogenesis and spermatogenesis. Which one is not true?
a. Production of ovum ceases at a certain age, but sperm production continues in old men.
b. Oogenesis begins in the embryonic stages, but spermatogenesis starts at the onset of puberty.
c. A meiotic arrest occurs both in oogenesis and spermatogenesis.
d. Polar bodies are formed in oogenesis.
Answer any nine questions from 4 – 14. Each carries 2 scores.
Question 4.
An evolutionary process occurred in the evolution of marsupial mammals in Australia is given below.
a. Name this evolutionary process.
b. Suggest another example of this phenomenon.
Question 5.
Rearrange the columns B & C with respect A
| A | B | C |
|
Monascus purpureus |
Steptokinase | Antibiotic |
| Streptococcus | Statin |
Immuno suppressant |
|
Penicillium notatum |
Cyclosporin-A | Clot buster |
|
Trichoderma polysporum |
Penicillin | Cholesterol-lowering agent |
Question 6.
Ramu cultivated pea plants as an intercrop in his paddy field. After harvesting, he allowed the roots of the pea plants remain in the soil for some period.
a. Do you think the action of Ramu is reasonable?
b. Justify your answer.
Question 7.
When the urine sample of a lady is tested, the presence of Human Chorionic Gonadotropin (HCG) is detected.
a. What does the presence of HCG indicate?
b. Which is the source of HCG?
Question 8.
Fill the columns A and B using the items given below.
| Column A | Column B |
| Development of D.D.T resistant ants | |
| Adaptive radiation | |
| Genetic drift | |
| Inheritance of acquired characters |
(Lamarkism, Evolution by anthropogenic action, Gene flow by chance, varieties of marsupials in Australia, De Vries)
Question 9.
The first child of a couple is affected with phenylketonuria. During the second pregnancy, they visited a genetic counselor and he prepared a pedigree chat of their family.
a. What is pedigree analysis?
b. Draw the symbols for
- Affected female.
- Sex unspecified.
- Consanguineous mating.
Question 10.
Arrange the following examples under two heads viz-homologous organs and analogous organs.
Forelimb of whale and bat,
Wings of butterfly and bat,
Heart of man and cheetah,
Eyes of octopus and mammals
Question 11.
The meaning of ‘antibiotics’ is ‘against life’, whereas with reference to human beings they are ’pro-life’.
Substantiate the statement with a suitable example.
Question 12.
Expand the following abbreviations which are commonly used in reproductive health
a. ART
b. ZIFT
Question 13.
One of your neighbour is suffering from itching, fluid discharge, slight pain and swelling in the genital region.
a. What do you think the disease he is suffering from?
b. What measures are to be taken to prevent such diseases?
Question 14.
Identify the diagram and write how it acts?
Answer any three from 15 – 18 questions. Each carries 3 scores.
Question 15.
Read the principle and answer the questions :
“Allele frequencies in a population are stable and constant from generation to generation called genetic equilibrium.”
a. Name the principle mentioned here.
b. Mention any two factors affecting the equilibrium.
c. What ¡s the significance .of disturbances occur in the genetic equilibrium?
Question 16.
Observe the figures and answer the questions.
a. Identify the type of natural selection A, B, and C with an explanation of each.
b. Define the Hardy-Weinberg principle
Question 17.
Blood of a man is tested positive for cannabinoid.
a. What are these?
b. From where these are extracted naturally?
c. Which part of the body is affected by these?
Question 18.
Given below is the diagrammatic representation of the operation of Natural Selection on different traits.
a. Identify the type of natural selection A, B, and C with an explanation of each.
b. Define the Hardy-Weinberg principle.
Answers
Answer 1.
Phenylketonuria
Answer 2.
Widal test
Answer 3.
c. A meiotic arrest occurs both in oogenesis and spermatogenesis.
Answer 4.
a. Adaptive radiation.
b. Darwin’s finches seen in Galapagos Island around South America
Answer 5.
Answer 6.
a. yes.
b. Rhizobium found in the root nodules of
Answer 7.
a. Pregnancy,
b. Placenta
Answer 8.
| Development of D.D.T resistant ants | Evolution of anthropogenic action |
| Varieties of Marsupials in Australia | Adaptive radiation |
| Gene flow by chance. | Genetic drift |
| Inheritance of acquired characters | Lamarckism |
Answer 9.
Analysing the inheritance of the character through several previous generations in a family called pedigree analysis.
Answer 10.
| Homologous organs | Analogous organs |
|
Forelimb of whale and bat. Heart of man and cheetah. |
Wings of butterfly and bat. Eyes of octopus and mammals. |
Answer 11.
The discovery of antibiotics greatly improved the quality of human life. Antibiotic drugs are made from living organisms such as fungi, molds of certain soil bacteria. Some bacteria that enter the human body can destroy human cells or causing diseases. Like pneumonia or tuberculosis. An antibiotic such as penicillin and streptomycin or others fight bacteria either by killing them or preventing them from multiplying. So antibiotics are ‘Pro-life’ to human beings.
Answer 12.
a. Assisted Reproductive Technology,
b. Zygote Intra Fallopian Transfer
Answer 13.
a. Sexually transmitted disease (STD),
b.
1. Avoid sex with an unknown partner.
2. Always use a condom during coitus.
Answer 14.
CuT condom. lUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of Sperms.
Answer 15.
a. Hardy – Weinberg principle.
b. Gene migration or gene flow, genetic drift and mutation.
c. Disturbance in genetic equilibrium change of frequency of alleles in a population would then be interpreted as resulting in the evolution
Answer 16.
a.
A – Klinefelter syndrome
B – Turner’s syndrome
b.
Chromosome number in A = 47
Chromosome number in B = 45
Answer 17.
a. Cannabinoid is a group of chemicals which interact with cannabinoid receptors present principally in the brain.
b.It is extracted from the inflorescences of the plant Cannabis sativa.
c. Which interact with Cannabinoid receptors present principally in the brain. Generally taken by inhalation and oral ingestion, these are known for their effects on the cardiovascular system of the body.
Answer 18.
a. A-Stabilising selection – (Intermediate characters are selected).
B-Directional selection – (Any one of the extreme characters selected).
C-Disruptive selection (Both the extreme characters selected).
It states that under certain conditions of stability, allele frequencies of a population are stable and constant from generation to generation in a sexually reproducing organism. This equilibrium is called genetic equilibrium or Hardy— Weinberg equilibrium.