Plus Two Zoology Previous Year Question Papers and Answers 2018 is part of Plus Two Zoology Previous Year Question Papers and Answers. Here we have given Plus Two Zoology Previous Year Question Papers and Answers 2018.
Plus Two Zoology Previous Year Question Papers and Answers 2018
|Sample Paper Set||2018|
|Category||Plus Two Previous Year Question Papers|
Time: 1 Hour
Cool off time: 10 Minutes
Maximum: 30 Score
General Instructions to Candidates :
- There is a ‘cool off time’ of 10 minutes each for Botany and Zoology in addition to the writing time of 1 hour each. Further, there is ‘5 minutes’ ‘Preparatory Time’ at the end of the Botany Examination and before the commencement of Zoology Examination.
- You are not allowed to write your answers nor to discuss anything with others during the ‘cool off time’ and ‘Preparatory time’.
- Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
- Read questions carefully before answering.
- All questions are compulsory and the only internal choice is allowed.
- When you select a question, all the sub-questions must be answered from the same question itself.
- Calculations, figures, and graphs should be shown in the answer sheet itself.
- Malayalam version of the questions is also provided.
- Give equations wherever necessary.
- Electronic devices except non-programmable calculators are not allowed in the Examination Hall.
Answer all questions from 1-3. Each question carries 1 score.
Name the cells in testes which synthesize and secrete the androgens.
Different contraceptive methods are given below. Pick out the odd one
a. Cu T
c. Multiload 375
d. Lippes loop
Expressed sequences in the gene are called
Answer any nine questions from 4-14 Each question carries 2 scores.
In a classroom discussion, a student said that the sex of the baby is determined by father. Analyse the statement and give a reason for it.
Different contraceptive methods are used to control the population explosion. Summarise the natural method and barrier of contraception.
DNA is tightly packed structure and is /found as units called nucleosomes.
a. Explain the concept of nucleosomes.
b. Differentiate between euchromatin and heterochromatin.
a. Observe the above cross and name the phenomenon.
b. Write down the theoretically given explanations of the phenomenon.
Complete the boxes with suitable words given below:
(Analogous, Homologous, Convergent evolution, Divergent evolution)
Explain the factors affecting the Hardy- Weinberg- equilibrium
Innate immunity is a non-specific type of defense and consists of four types of barriers. Categorise the barriers and give one example for each.
Complete the table given below:
|….B…||Rhinovirus||Sore throat hoarseness|
|Malignant Malaria||…..C…||Chill high fever|
|…. D…..||Wuchereria||Chronic inflammation of lymph gland|
Consumption of drug and alcohol affects the persons mental and physical health very badly. List the warning signs of alcohol or drug abuse.
Identify the disadvantages of RNA over DNA as genetic material and explain it.
Complete the table with appropriate terms:
|Organism||Scientific name||Bioactive Product|
|B||Acetobacter aceti||Acetic acid|
Answer any three from 15-18 questions. Each questions carriers 3 Scores.
Observe the graph and answer the following questions:
a. Name S, A, Z and C in the graph.
b. Name the scientists who explained the Species-Area relationship.
a. In lac Opero lactose act as inducer molecule. Evaluate the statement and explain it.
b. Observe the diagram of lac Operon and identify labeled parts. A, B, C, and D.
Sexually transmitted diseases (STD) are mainly transmitted through sexual contact.
a. Name any two examples of sexually transmitted disease.
b. Explain any two methods adopted to prevent STD’s
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 the inborn error of metabolism? Mention the cause of the disorder.
In humans, sex determination mechanism is XY type A pair of x chromosomes are present in the female, whereas the presence of an x and y chromosome are determinants of the male characters. During spermatogenesis, the male produces two types gamates X and Y
By avoiding chances of meeting the ovum and sperm.
a. Periodic abstinence
Avoid coitus from day 10 to 17 of the menstrual cycle when ovulation could be expected. This is a fertile period.
b. Coitus interruptus
Sexual intercourse in which the penis is withdrawn from the vagina before ejaculation to avoid insemination.
c. Lactational amenorrhea
It involves the prevention of contraception by breastfeeding the child.
Devices used for preventing the physical meeting between ovum and sperm.
a. The negatively charged DNA is wrapped around positively charged histones octamer to form a structure called nucleosomes. Nucleosome constitutes the repeating unit of a structure in nucleus called chromatin, thread-like stained bodies seen in the nucleus,
b. The region of chromatin, which is loosely packed and stains light arc euchromatin, which is transcriptionally alive. Densely packed and transcriptionally inactive chromatin, which stains dark arc called as heterochromatin.
a. Incomplete dominance
b. “It is a phenomenon in which phenotype of the Fj hybrid offspring does not resemble any of the parents even it is the intermediate between the expression of two alleles in their homozygous state”.
a. A – Homologous
B – Divergent evolution
C – Analogs
D – Convergent evolution
a. Gene migration or gene flow.
d. Genetic recombination
e. Natural selection
1. It is a non-specific type of defense.
2. It is present at the time of birth.
3. It is accomplished by providing four different types of barriers.
- The skin on our body is the main physical barrier which prevents entry of the micro-organisms.
- Mucus-coating of the epithelium lining the respiratory, gastrointestinal, and urogenital tracts help in trapping microbes entering our body.
- The acid in the stomach, saliva in the mouth and tears from eyes prevent microbial growth.
Can phagoytose and destroy microbes.
- The proteins, secreted by virus-infected cells are called interferons.
- Interferons protect non-infected cells from further viral infection.
A – Salmonella typhi
B – Common cold
C – Plasmodium vivax
D – Filariasis
Drop in academic performance and absence from sehhorl.
Lack of interest in personal hygiene.
Withdrawal and isolation from family and friends.
Depression and fatigue
Loss of interest in personal hygiene.
Compared to DNA, RNA acts as the genetic material in some viruses, and RNA, Uracil is present (less stable compared to thymine) RNA is a single-stranded molecule.
A – Aspergillus niger
B – Bacteria
C – Cyclosporin A
D – Monoscuspurpureus
S – species richness
Z – the slope of line C – Y intercept
b. Alexander Von Humboldt
a. In the presence of an inducer, such as lactose
or allolactose, the repressor is inactivated by interaction with the inducer. This allows RNA polymerase access to the promoter and transcription proceeds.
b. A-Repressor B – b-galactosidase
C – Permease
D – Transacetylase
a. Gonorrhea, Syphilis
i. Avoid sex with unknown partners / multi pie partners.
ii. Always use condoms during coitus.
iii. In case of doubt go to a qualified doctor for early detection and get complete treatment.
a. Mendelian disorders are genetic disorders
caused due to alteration or mutation in a single gene,
b. Phenyl Ketonurea
It is an inborn error of metabolism in which an affected individual lacks an enzyme that converts the amino acid phenylalanine into tyrosine.
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