{"id":27481,"date":"2020-07-01T17:29:41","date_gmt":"2020-07-01T11:59:41","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=27481"},"modified":"2021-07-02T15:07:08","modified_gmt":"2021-07-02T09:37:08","slug":"2nd-puc-biology-previous-year-question-paper-june-2018","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/2nd-puc-biology-previous-year-question-paper-june-2018\/","title":{"rendered":"2nd PUC Biology Previous Year Question Paper June 2018"},"content":{"rendered":"<p>Students can Download 2nd PUC Biology Previous Year Question Paper June 2018, Karnataka <a href=\"https:\/\/kseebsolutions.guru\/2nd-puc-biology-model-question-papers-with-answers\/\">2nd PUC Biology Model Question Papers with Answers<\/a> helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.<\/p>\n<h2>Karnataka 2nd PUC Biology Previous Year Question Paper June 2018<\/h2>\n<p>Time: 3 hrs 15 min<br \/>\nMax. Marks: 70<\/p>\n<p>General Instructions<\/p>\n<ul>\n<li>This question paper consists of four parts A, B, C and D. Part &#8211; D consists of two sections. Section &#8211; I and Section &#8211; II.<\/li>\n<li>All the parts are compulsory.<\/li>\n<li>Draw diagrams wherever necessary. Unlabelled diagrams or illustrations do not attract any marks.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\">Part &#8211; A<\/span><\/p>\n<p><span style=\"color: #0000ff;\">Answer the following questions in one word or one sentence each. (10 \u00d7 1 = 10)<\/span><\/p>\n<p>Question 1.<br \/>\nDefine Menarche?<br \/>\nAnswer:<br \/>\nThe first menstruation begins at puberty.<\/p>\n<p>Question 2.<br \/>\nName the disease caused by Haemophilus influenzae.<br \/>\nAnswer:<br \/>\nPneumonia.<\/p>\n<p>Question 3.<br \/>\nMention the importance of selectable markers in plasmids.<br \/>\nAnswer:<br \/>\nIt helps in identifying and eliminating non-transformants or selectively permitting the growth of the transformants.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 4.<br \/>\nWhich is the fish caught in South Africa in 1938, which was thought to be extinct?<br \/>\nAnswer:<br \/>\nCoelacanth<\/p>\n<p>Question 5.<br \/>\nName the hormone released by the ovary in the later phase of pregnancy.<br \/>\nAnswer:<br \/>\nRelaxin<\/p>\n<p>Question 6.<br \/>\nWhy meristems are preferred in tissue culture?<br \/>\nAnswer:<br \/>\nThe meristem is free of virus i.e., in tissue culture if the plant is infected with a virus, by removing meristem one can grow virus-free plants.<\/p>\n<p>Question 7.<br \/>\nMention the type of antibody present in the colostrum.<br \/>\nAnswer:<br \/>\nIgA.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 8.<br \/>\nWhy mammals of colder climate generally have shorter ears and limbs?<br \/>\nAnswer:<br \/>\nTo minimise heat loss from the body.<\/p>\n<p>Question 9.<br \/>\nName the unit used to measure ozone layer thickness.<br \/>\nAnswer:<br \/>\nDobson units (DU)<\/p>\n<p>Question 10.<br \/>\nMention the commercial importance of Monascus Purpureus.<br \/>\nAnswer:<br \/>\nBlood &#8211; cholesterol-lowering agent.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\">Part &#8211; B<\/span><\/p>\n<p><span style=\"color: #0000ff;\">Answer any five of the following questions in 3 to 5 sentences each: Wherever applicable: (5 \u00d7 2 = 10)<\/span><\/p>\n<p>Question 11.<br \/>\nDistinguish between the menstrual cycle and the oestrus cycle.<br \/>\nAnswer:<br \/>\nNon-primates like cows, sheep etc., show certain cyclic changes during reproduction called oestrus cycle while \u00a1n primates like apes and humans, the cycle is referred to as a menstrual cycle.<\/p>\n<p>Question 12.<br \/>\nWhat is the test cross? Write its significance.<br \/>\nAnswer:<br \/>\nIt is a kind of back cross where F<sub>1<\/sub> plant is crossed with its recessive parent.<br \/>\nIt helps in finding F<sub>1<\/sub> plant is homozygous or heterozygous.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 13.<br \/>\nWhat are analogous organs? Give an example.<br \/>\nAnswer:<br \/>\nThese are organs which Are different in structure and origin but perform similar functions.<br \/>\nEg. Eyes of octopus and mammals.<\/p>\n<p>Question 14.<br \/>\nMention the objectives of biofortification. .<br \/>\nAnswer:<br \/>\nObjectives of improving<\/p>\n<ul>\n<li>Protein content and quality<\/li>\n<li>Oil content and quality<\/li>\n<\/ul>\n<p>Question 15.<br \/>\nDraw a neat labelled diagram of the structure of an antibody.<br \/>\nAnswer:<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-65066\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q15.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018 Q15\" width=\"367\" height=\"311\" srcset=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q15.png 367w, https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q15-300x254.png 300w\" sizes=\"(max-width: 367px) 100vw, 367px\" \/><\/p>\n<p>Question 16.<br \/>\nWhat are palindromic nucleotide sequences? Write the restriction site for Eco-RI enzyme.<br \/>\nAnswer:<br \/>\nThe palindrome in DNA is a sequence of base pairs that read the same on the two strands in 5<sup>1<\/sup> \u2192 3<sup>1<\/sup> direction and in 3<sup>1<\/sup> \u2192 5<sup>1<\/sup> direction.<br \/>\nRestriction site for ECORI is<br \/>\n5<sup>1<\/sup> &#8211; GAATTC &#8211; 3<sup>1<\/sup><br \/>\n3<sup>1<\/sup> &#8211; CTTAAG &#8211; 5<sup>1<\/sup><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 17.<br \/>\nName any two species which have become extinct due to overexploitation.<br \/>\nAnswer:<\/p>\n<ul>\n<li>Steller\u2019s Sea cow<\/li>\n<li>Passenger pigeon<\/li>\n<\/ul>\n<p>Question 18.<br \/>\nWhat are the sacred groves? Name any two sacred groves of India.<br \/>\nAnswer:<br \/>\nSacred grooves are large tracts of forests where trees and wildlife within are conserved due to cultural and religious beliefs.<br \/>\nEg.: Khasi and Jainta hills in Meghalaya<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\">Part &#8211; C<\/span><\/p>\n<p><span style=\"color: #0000ff;\">Answer any five of the following questions in about 40 to 80 words each wherever applicable: (5 \u00d7 3 = 15)<\/span><\/p>\n<p>Question 19.<br \/>\nDefine asexual reproduction. Mention asexual reproductive structures in penicillium and sponge.<br \/>\nAnswer:<br \/>\nThe production of offsprings by a single parent without formation and fission of gametes.<br \/>\nPenicillium &#8211; conidia<br \/>\nSponge &#8211; Gemmule<\/p>\n<p>Question 20.<br \/>\nDraw a neat labelled diagram of a typical Anatropous ovule of angiosperms.<br \/>\nAnswer:<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-65067\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q20.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018 Q20\" width=\"323\" height=\"280\" srcset=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q20.png 323w, https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q20-300x260.png 300w\" sizes=\"(max-width: 323px) 100vw, 323px\" \/><\/p>\n<p>Question 21.<br \/>\nWrite a note on colour blindness.<br \/>\nAnswer:<\/p>\n<ul>\n<li>It is a sex-linked recessive disorder due to defect in either red or green cone of the eye resulting in failure to discriminate between red and green colour.<\/li>\n<li>This defect is due to mutation in certain genes present in the X-chromosome.<\/li>\n<li>It occurs in about 8% of males and only about 0.4% of females.<\/li>\n<\/ul>\n<p>Question 22.<br \/>\nDefine adaptive radiation.<br \/>\nAnswer:<br \/>\nThe evolution of closely related species in a given geographical area starting from a point.<br \/>\nEg.: Darwin\u2019s finches Australian marsupials<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 23.<br \/>\nWhat are the ecological pyramids? Draw an ideal pyramid of energy and mention its units.<br \/>\nAnswer:<br \/>\nPyramid of Energy: It is a graphic representation of available energy at successive trophic levels in a food chain. The energy level is expressed as kilocalorie. It is the typical upright pyramid. It illustrates decreasing energy level at successive trophic levels from producers at the base to the consumers. The energy level is maximum in producers and less in consumers. e.g.: Pond food chain.<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-65068\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q23.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018 Q23\" width=\"218\" height=\"240\" \/><\/p>\n<p>Question 24.<br \/>\nWhat is a biopsy test? Mention any two techniques of cancer detection and diagnosis.<br \/>\nAnswer:<br \/>\nA thin piece of the suspected tissue is stained and examined under a microscope.<\/p>\n<ul>\n<li>Radiography<\/li>\n<li>C.T Scan<\/li>\n<\/ul>\n<p>Question 25.<br \/>\nWrite the important use of the following in rDNA technology.<\/p>\n<ol>\n<li>P.C.R.<\/li>\n<li>Ethidium bromide<\/li>\n<li>Bioreactor (1 + 1 + 1)<\/li>\n<\/ol>\n<p>Answer:<\/p>\n<ol>\n<li>It is used to synthesise multiple copies of the gene of interest.<\/li>\n<li>It is used to stain separated DNA fragments.<\/li>\n<li>It is used to produce a large number of products where large volumes of culture can be processed.<\/li>\n<\/ol>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 26.<br \/>\nDescribe the process of primary succession on bare rocks.<br \/>\nAnswer:<\/p>\n<ul>\n<li>In primary succession on rocks, lichens are the pioneer species. Lichens secrete acids to dissolve rock helping the weathering and soil formation.<\/li>\n<li>These later pave the way to some very small plants like bryophytes, which are able to take hold in the small amount of soil.<\/li>\n<li>They are with time succeeded by bigger plants and after several more stages, ultimately a stable climax forest community is formed.<\/li>\n<li>The climax community remains stable as long as the environment remains unchanged.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\">Part &#8211; D<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\">Section &#8211; I<\/span><\/p>\n<p><span style=\"color: #0000ff;\">Answer any four of the following questions in about 200 to 250 words each, wherever applicable: (4 \u00d7 5 = 20)<\/span><\/p>\n<p>Question 27.<br \/>\n(a) What are false fruits? Give an example. (2)<br \/>\nAnswer:<br \/>\nThe fruits develop from the ovary and thalamus.<br \/>\nEg.: Apple, cashew<\/p>\n<p>(b) Write the characteristic features of insect-pollinated flowers. (3)<br \/>\nAnswer:<\/p>\n<ul>\n<li>The flowers are large, conspicuous, coloured and showy.<\/li>\n<li>The flowers have a fragrance and sweet nectar.<\/li>\n<li>Pollen grains are rough and surrounded by a sticky substance called pollen kit.<\/li>\n<\/ul>\n<p>Question 28.<br \/>\nDraw a neat labelled diagrammatic view of the human male reproductive system.<br \/>\nAnswer:<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-65069\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q28.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018 Q28\" width=\"501\" height=\"357\" srcset=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q28.png 501w, https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q28-300x214.png 300w\" sizes=\"(max-width: 501px) 100vw, 501px\" \/><\/p>\n<p>Question 29.<br \/>\n(a) Explain the following assisted reproductive technologies:<br \/>\n(i) IVF-ET<br \/>\n(ii) ZIFT<br \/>\n(iii) ICSI (1 + 1 + 1)<br \/>\nAnswer:<br \/>\n(a) (i) IVE-ET: The fertilisation outside the body of the mother in a simulated condition. The transfer, of the embryo to the fallopian tube or uterus of a surrogate mother.<br \/>\n(ii) ZIFT: Zygotes with 8 blastomeres are transferred into the fallopian tube.<br \/>\n(iii) ICSI: Sperm is directly injected into the ovum in the laboratory.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>(b) Name any two hormone-producing XUD\u2019s. (2)<br \/>\nAnswer:<br \/>\nProgestasert LNG &#8211; 20.<\/p>\n<p>Question 30.<br \/>\nExplain the law of independent assortment with reference to seed shape and seed colour in garden tea plant.<br \/>\nAnswer:<br \/>\nRefer Dihybridcross &amp; Law of independent Assortment, Page No. 96 &amp; 97.<\/p>\n<p>Question 31.<br \/>\nDescribe the various steps of plant breeding programs.<br \/>\nAnswer:<br \/>\nPlant breeding is the manipulation of plant species in order to create desired plant types that are better suited for cultivation, give better yields and are disease resistant.<br \/>\n(i) Collection of variability:<br \/>\nCollection and preservation of all the different wild varieties, species and closely related plants of the cultivated species is a pre-requisite for effective exploitation of natural genes available in the populations. This collection constitutes th\u00e9 germplasm.<\/p>\n<p>(ii) Evaluation and selection of parents:<br \/>\nThe germplasm so collected is evaluated to identify\u2019 plants with desirable characters.<br \/>\nThe selected plants are multiplied and used in the process of hybridisation.<br \/>\nPure lines are created (by repeated self-pollination) wherever possible and desirable.<\/p>\n<p>(iii) Cross hybridisation of the selected parents:<br \/>\nIt involves crossing of two plants which differ in one or more desirable characters to produce a hybrid having the characters of both the parents.<br \/>\nThis is a very time-consuming and tedious process.<br \/>\nAlso, it is not necessary that the hybrids will combine the desirable characters.<\/p>\n<p>(iv) Selection and testing of superior recombinants:<br \/>\nFirst, the individuals with the desired combination of characters have to be selected from among th progeny of hybrids.<br \/>\nSuch hybrids are superior to both of the parents (hybrid vigour\/heterosis).<br \/>\nThey are self-pollinated for several generations till they reach a state of homozygosity so that there will be no segregation of characters in the progeny.<\/p>\n<p>(v) Testing, release and commercialisation of new cultivars:<br \/>\n(a) Evaluation:<br \/>\nThe selected lines are evaluated for their yield and other agronomy traits, disease resistance, etc.<br \/>\nEvaluation is done by growing these plants in the research fields and recording their performance under ideal conditions of irrigation, application of fertilisers and other crop management practices.<\/p>\n<p>(b) Testing:<br \/>\nThe plants selected after evaluation are tested in the farmers\u2019 fields for at least three growing seasons, at several locations in the country, representing different agroclimatic zones, where the crop is normally grown.<br \/>\nThe material is evaluated in comparison to the best available local cultivar as reference material.<\/p>\n<p>(c) Release:<br \/>\nThe material thus selected is certified and released as a variety.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 32.<br \/>\n(a) Mention the chemical linkages between the components of DNA. (3)<br \/>\nAnswer:<br \/>\nH-bond, Glycosidic bond &amp;phospho diester bond.<\/p>\n<p>(b) Differentiate Euchromatin from Heterochromatin. (2)<br \/>\nAnswer:<br \/>\nEuchromatin: Loosely packed and transcriptionally active chromatin.<br \/>\nHeterochromatin: Densely packed and inactive region of chromatin.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\">Section &#8211; II<\/span><\/p>\n<p><span style=\"color: #0000ff;\">Answer any three of the following questions in about 200 to 250 words each wherever applicable: (3 \u00d7 5 = 15)<\/span><\/p>\n<p>Question 33.<br \/>\nWhat are VNTR\u2019s? Mention the steps to detect VNTR\u2019s in identifying criminals in forensic investigations.<br \/>\nAnswer:<br \/>\nThe DNA fragments that show very high degree polymorphism.<\/p>\n<ul>\n<li>Isolation of DNA<\/li>\n<li>Digestion of DNA by restriction endonucleases.<\/li>\n<li>Separation of DNA fragments by electrophoresis.<\/li>\n<li>Transferring of separated DNA fragments to synthesize membranes, such as nitrocellulose or nylon.<\/li>\n<li>Hybridisation using labelled VNTR probe.<\/li>\n<li>Selection of hybridised DNA fragments by autoradiography.<\/li>\n<\/ul>\n<p>Question 34.<br \/>\n(a) Draw a neat labelled diagram of the typical biogas plant. (3)<br \/>\nAnswer:<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-65070\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q34a.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018 Q34(a)\" width=\"386\" height=\"408\" srcset=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q34a.png 386w, https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q34a-284x300.png 284w\" sizes=\"(max-width: 386px) 100vw, 386px\" \/><\/p>\n<p>(b) Mention the beneficial role of anaerobic bacteria in secondary sewage treatment.<br \/>\nAnswer:<br \/>\nAnaerobic bacteria digest the bacteria and fungi (FLOCS) in the sludge. During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas &amp; can be used as a source of energy.<\/p>\n<p>Question 35.<br \/>\nList the benefits, of transgenic animals.<br \/>\nAnswer:<br \/>\n1. Normal physiology and development: Transgenic animals can be specifically designed to allow the study of how genes are regulated, and how they affect the normal functions of the body and its development.<\/p>\n<p>2. Study of disease: Many transge\u00f1ic animals are designed to increase our understanding of how genes contribute to the development of the disease. e.g.: Cancer, cystic fibrosis, rheumatoid arthritis and Alzheimer\u2019s.<\/p>\n<p>3. Biological products: Medicines required to treat certain human diseases are biological products. But such useful biological products can be created by the introduction of the portion of DNA (or genes) into an animal which codes for a particular transgenic product.<\/p>\n<p>4. Vaccine safety: Safety of vaccines must be confirmed before they are administered. e.g.: Transgenic mice are being used to test the safety of the polio vaccine.<\/p>\n<p>5. Chemical safety testing: This is known as toxicity\/safety testing. The procedure is the same as that used for testing the toxicity of drugs. Transgenic animals are made to carry genes which make them more sensitive to toxic substances than non-transgenic animals. They are then exposed to the toxic substances and the effects studied.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2019\/11\/KSEEB-Solutions.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018\" width=\"172\" height=\"16\" \/><\/p>\n<p>Question 36.<br \/>\n(a) Write any four factors that influence population density. (2)<br \/>\nAnswer:<br \/>\nNatality, Mortality, Immigration &amp; Emigration<\/p>\n<p>(b) Draw a graph showing exponential growth curve. (2)<br \/>\nAnswer:<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-65071\" src=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q36b.png\" alt=\"2nd PUC Biology Previous Year Question Paper June 2018 Q36(b)\" width=\"360\" height=\"295\" srcset=\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q36b.png 360w, https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/07\/2nd-PUC-Biology-Previous-Year-Question-Paper-June-2018-Q36b-300x246.png 300w\" sizes=\"(max-width: 360px) 100vw, 360px\" \/><\/p>\n<p>(c) What is sexual deceit? (1)<br \/>\nAnswer:<br \/>\nOne petal of Ophrys resembles a female bee in size. So male bee pseudocopulation with the flower. It is brown as sexual deceit.<\/p>\n<p>Question 37.<br \/>\nWrite a short note on the following :<\/p>\n<ol>\n<li>Greenhouse gases<\/li>\n<li>Catalytic converter<\/li>\n<li>Ultra-violet B<\/li>\n<li>Ozone layer<\/li>\n<li>Electrostatic precipitator. (1 + 1 + 1 + 1 + 1)<\/li>\n<\/ol>\n<p>Answer:<\/p>\n<ol>\n<li>CO<sub>2<\/sub>, methane, CFCs &amp; N<sub>2<\/sub>O are known as greenhouse gases. They are responsible for the greenhouse effect.<\/li>\n<li>The catalytic converter is fitted into automobiles for reducing the emission of poisonous gases.<\/li>\n<li>UV-B damages DNA and mutation may occur. It causes ageing of the skin, damage to skin cells, skin cancers and snow blindness.<\/li>\n<li>The ozone layer acts as a shield and absorbs ultraviolet radiation from the sun.<\/li>\n<li>It is a device used to remove particulate matter in the exhaust from a thermal power plant.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Students can Download 2nd PUC Biology Previous Year Question Paper June 2018, Karnataka 2nd PUC Biology Model Question Papers with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations. Karnataka 2nd PUC Biology Previous Year Question Paper June 2018 Time: 3 hrs 15 min Max. Marks: &hellip;<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[82],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/27481"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=27481"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/27481\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=27481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=27481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=27481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}