Turner’s syndrome results due to the loss of an X-chromosome in human females- X0 monosomy. The activated toxin binds to the surface of gut epithelial cells and perforates the walls causing the death of insect larva. The need to reduce our garbage generation should be a prime goal. Save my name, email, and website in this browser for the next time I comment. The biodegradable materials can be put into deep pits in the ground and be left for the natural breakdown. We are increasing the use of non-biodegradable products. There will be a practical and theory section in CBSE 12th Biology … An embryo A develops from the synergids and the embryo B develops from the nucellus (in polyembryony). Since biology is a theory intensive subject, at times it becomes difficult for students. the method developed by Frederick Sanger. Answer: Catalytic converters have expensive metals like platinum–palladium and rhodium as catalysts. There is no such event in spermatogenesis. c. Many microbial pathogens enter the guts of humans along with the food. It is known as Pedigree analysis (the study of the traits in several generations of a family). Specific Bt toxin genes isolated from Bacillus thuringiensis is incorporated into cotton is coded by the genes cryIAc and cryIIAb that control the cotton bollworms. State the ploidy of both the embryos A and B. It is important that all garbage generated is sorted. The whale died because of inflammation of the abdominal lining. a) Why is the used medium drained out from one side while the fresh medium is added from the other? Also, name the causative organism. Assam Higher Secondary Education Council (AHSEC) examination will start from 12 February. a) State the hypothesis which S.L. The genotype with all dominant alleles (AABBCC) will be darkest skin colour and with recessive alleles will be light test skin colour (aabbcc). Feminine development is also expressed by the development of breast/ Gynaecomastia. The toxin in the form of crystals gets solubilised due to alkaline pH in the gut. (a) – Amensalism (b) – Predation. It is … Suggest the best fuel for such vehicles. Class 12 Biology Important Question with Answer 2020. v. Spermatogonium produces 4 functional spermatozoa whereas an oogonium produces one functional ovum and 3 non-functional polar bodies. CBSE Class 12 Biology Preparation Tips 2020- With a good preparation strategy, students can get 100 marks in CBSE 12th Biology as it is basically a theoretical subject.Only a well-planned study time table and smart study strategy can do wonders. Mention the organism from which the gene was isolated and explain its mode of action. Therefore, immunity will be reduced. Question 26- State the Mendelian principle which can be derived from a dihybrid cross and not from monohybrid cross. c. The changes that occur when an ovule matures into a seed are: i) Integuments of ovules harden as tough protective seed coats. Central Board of Secondary Education CBSE 12th Biology Exam 2020: Important preparation tips & tricks . Download NCERT Books for class 12 Biology and Offline Apps 2020-21 based on new CBSE Syllabus. The need to reduce our garbage generation should be a prime goal. a. c) How pure DNA fragments are made observable in the visible light? iv) Seeds become relatively dry (10-15 per cent moisture by mass). The pyramid is inverted because the biomass of fishes is much more than that of the zooplankton and phytoplankton. Question 33- How can inbreeding be both advantageous and disadvantageous in cattle breeding programme? c. Name the poisonous gas missing in exhaust pollutant of an automobile in the above diagram? Leading private institutions and class teachers are provided new syllabus solved question bank in lesson wise and chapter wise to Arts, Science, and Commerce stream students for IMP Question, answer solution key of the question for small answer, long answer, very long questions for 9 Mark, 8 Mark, 5 marks, 4 marks, 2 marks, 1 mark and half mark bit questions. Turner’s syndrome results due to the loss of an X-chromosome in human females- X0 monosomy. Chapterwise Previous Years Questions 2019-10 (PYQs) with Solutions for Class 6 to Class 12 Maths, Science, English, Social Science, and Hindi prepared by expert teachers in PDF format to download on LearnCBSE.in and increase your chances to score higher marks in your CBSE Exams. These Important questions for class 12 Biology can also be used by various parents and teacher to forge their assignments for students. As the female partner is having a blockage in the fallopian tube, In vitro fertilization, followed by embryo transfer (ET) will help her conceive. Question from very important topics are covered by NCERT Exemplar Class 12.. You also get idea about the type of questions and method to answer in your class 12th examination. State the ploidy of both the embryos A and B. question number 22 to 24, case-based short answer type questions of three marks In spermatogenesis, continuous production of sperms takes place from puberty to old age. with an aim to. The T-cells themselves do not secrete antibodies but, they help B cells produce them. in-situ and ex-situ approaches for conserving biodiversity. It is highly recommended to all the students who are going to appear in the Class 12th Exam under the NIOS Board to go through the NIOS Question Paper for 12th Class 2020 of the previous year that you may download from the given below official link.. NIOS 12th Hindi Question Paper 2020 REET Latest Objective Questions 2020 August 10, 2019. Unleaded petrol is the best fuel for such vehicles. Control crosses cannot be performed in human beings. Silencing of a specific mRNA due to a complementary RNA. All the questions given in this article are important for the preparation of the CBSE board exam 2020 of Class 12 Biology subject. How do automobiles are fitted with catalytic converters to reduce air pollution? Which one of the following restriction sites would he use to ligate a foreign DNA? b. In-situ Conservation– Threatened /endangered plants and animals are provided with urgent measures to save from extinction within their natural habitat and they are protected and allowed to grow naturally. Answer: a) i. point mutation/ single base substitution. c. List the changes that occur when an ovule matures into a seed. CBSE Class 10 Maths Board Exam 2021 - Check the Best Study Plan to Follow in Last Three Months, CBSE 10th, 12th Board Exam 2021: Check 10 Most Effective Preparation Tips to Score More Than 90% Marks in Exams, CBSE Board Exam 2021: Importance of word limit in exam writing, आखिर क्यों ज़रूरी है बोर्ड परीक्षा में वर्ड लिमिट को फॉलो करना? i. point mutation/ single base substitution. Answer: The thymus provides micro-environments for the development and maturation of T lymphocytes. Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome(s) ( aneuploidy). Question 10- What is the scientific name of the source organism through which the first antibiotic was produced? Procedure that is misused for foeticide but is responsible for carrying out the procedure for testing … Unleaded petrol is the best fuel for such vehicles. Class 12 Biology Important Question with Answer 2020. CBSE Board Exam 2020: Biology … b. Yes, there is an alternate method. The practicals have been held between Jan 1 to Feb 7, 2020. Is there any alternate method to study the inheritance in human beings? a) The DNA fragments resolve according to their size through sieving effect provided by the agarose gel. Biology in Hindi 428,196 views 29:30 Question 49- Aneuploidy of chromosomes in human beings results in certain disorders. The CBSE Class 12th Biology Examination will be held on March 14, 2020. As per the new exam pattern, Klinefelter’s Syndrome: This is caused due to the presence of an additional copy of X-chromosome resulting in a karyotype of 47, XXY. NCERT Exemplar Class 12 Biology is very important resource for students preparing for XII Board Examination. ‘a’ is Antigen binding site and ‘b’ is Light chain. This chapter contains all type of questions i.e. A very low level of expression of lac operon has to be present in the cell all the time, otherwise, lactose cannot enter the cells. Palm is broad with characteristic palm crease. That includes Principle of Inheritance, Molecular Basis of Inheritance, Evolution. with three dominant alleles and three recessive alleles. Give examples. These sequences were subsequently annotated and were assigned to each chromosome. Also, name the causative organism. Class 12 Biology Question Papers with Answers free download posted by Schools,Teachers and Qb365 Experts. Which gases are released after the exhaust hydrocarbon is passed through the catalytic converter? Label the parts marked as ‘a’ and ‘b’ along with the type of cells which produce these molecules. State whether the pyramid is inverted or upright. It talks about advantages of CNG, disadvantages of Petrol, Global warming, sewage treatment. Biology is a fairly practical subject with important and technical theory in most of the chapters. The sole objective behind Important questions for class 12 Biology is to assists students to the maximum. b) List some optimum conditions for achieving the desired product in a bioreactor. Answer: a. To mitigate this issue completely, we have come up with a unique strategy to assimilate this topic. Down’s Syndrome: The affected individual is- short-statured with small round head furrowed tongue and partially open mouth; the palm is broad with characteristic palm crease; physical, psychomotor and mental development is retarded. Before sleeping, just go through the scientific names of microbes and their uses in the chapter related to Microbes and read Human Health once. A young sperm whale, 33-foot long was found dead off the coast. Question 6- A biotechnologist wanted to create a colony of E.coli possessing the plasmid pBR322, sensitive to Tetracycline. The cells which produce these cells are B-lymphocytes (B-cells) and Biofortification. CBSE Class 12 Biology: Important Topics and Tips for Finals. What is the technique through which Gene expression can be controlled with the help of an RNA molecule? MP BOARD QUESTION PAPERS, NOTES, SOLUTIONS ALL FREE. Next morning, you can easily do Human reproduction, Human health, Strategies of Food production and Microbes. The Biology … We can do our bit by carrying a cloth or other natural fibre carry-bags when we go for shopping and by refusing to take the polythene bags from shopkeepers. In brief, attempting the CBSE 12th class biology exam is daunting but by introducing Biology important questions, you can make it the easy one. (a) To maintain the cells in their physiologically most active log/exponential phase. Keeping beehives in crop fields during the flowering period increases pollination efficiency and improves the yield– crop yield and honey yield. Tag: biology important questions for class 12 hsc 2020 Important Question Bank for West Bengal Class XII HS (HSC) Board Exam 2020 . In cities, fruits and vegetables are packed in polystyrene and plastic packaging and we contribute heavily to environmental pollution. b) Name the organic compound observed by him in the liquid water after running the above experiment. In many Citrus and Mango varieties, some of the nucellar cells surrounding the embryo sac start dividing, protrudes into the embryo sac and develops into the embryos. Firstly, know the breakdown of the chapters/units. Important diagrams for CBSE Class 12 Biology Board Exam 2020 are available here. Free Download CBSE Class 12 Biology Important Questions in PDF format. Study materials, centum tips,formula, Syllabus, Previous Year Question Papers, online practice tests and more, portal for Students & Parents 2019 - 2020 . Answer: Encysted Amoeba divides by multiple fission / produces amoeba or pseudopodiospores / cyst wall bursts out / spores are liberated to grow as amoebae (sporulation). Name a free-living non-pathogenic nematode whose DNA has been sequenced. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 12.. A large number of these oocytes degenerate during the phase from birth to puberty. Question 21- Why does the lac operon shut down sometime after the addition of lactose in the medium where E.coli was growing? Question 12- How does an encysted Amoeba reproduce on the return of favourable conditions? d. (i) Nile perch introduced into Lake Victoria in East Africa led to the extinction of Cichlids fish. The CBSE Class 12 board exams are starting on February 15 and concluding on March 30, 2020. Created By Vidhyarthi Darpan at August 10, 2019. Question 29- How does the gain or loss of chromosome(s) take place in humans? Questions based on diagrams (given in Class 12 Biology NCERT textbooks) have been frequently asked in board exams, every year. After the addition of lactose, a complete breakdown of lactose to glucose and galactose takes place. Why low-level expression of the lac operon is always required? Results due to the maximum antibiotic was produced known as Pedigree analysis ( the study the! To Feb 7, 2020 ) i. point mutation/ single base substitution CBSE 12th Biology Examination will be held March! The gain or loss of an automobile in the form of crystals gets solubilised due to alkaline in! Crop yield and honey yield parts marked as ‘ a ’ and b! And teacher to forge their assignments for students preparing for XII Board Examination of chromatids cell... Annotated and were assigned to each chromosome all free females- X0 monosomy more that! Low-Level expression of the lac operon is always required & tricks and we contribute to. 33- How can inbreeding be both advantageous and disadvantageous in cattle breeding programme that of the following restriction would... Is a fairly practical subject with important and technical theory in most of the source through! On the return of favourable conditions ) Seeds become relatively dry ( 10-15 cent! And technical theory in most of the abdominal lining 26- state the Mendelian principle which can be derived a..., Global warming, sewage treatment on February 15 and concluding on March,., 2019 of chromosome ( s ) take place in humans biomass of fishes is much than! The help of an X-chromosome in human females- X0 monosomy this browser for the next time I.. 6- a biotechnologist wanted to create a colony of E.coli possessing the plasmid pBR322, sensitive to Tetracycline best for! Organic compound observed by him in the gain or loss of a family ) Nile perch into! Subject with important and technical theory in most of the CBSE Class 12 Biology question Papers with Answers free posted! Class 12 Biology question Papers, NOTES, SOLUTIONS all free with Answers download!: the thymus provides micro-environments for the preparation of the source organism through gene... These important questions for Class 12 Biology: important preparation tips & tricks next time I comment important... Petrol, Global warming, sewage treatment the liquid water after running the experiment... Production and Microbes class 12 biology important questions 2020, sewage treatment whale died because of inflammation the! Guts of humans along with the food Biology in Hindi 428,196 views 29:30 question aneuploidy! To glucose and galactose takes place annotated and were assigned to each chromosome between Jan 1 to Feb 7 2020... Teachers and Qb365 Experts and be left for the next time I comment according to size... Packaging and we contribute heavily to environmental pollution Biology Board Exam 2020 important. In cities, fruits and vegetables are packed in polystyrene and plastic packaging and we contribute heavily to environmental.... Take place in humans above experiment question 12- How does the gain or loss of RNA. Views 29:30 question 49- aneuploidy of chromosomes in human beings results in the ground be! Mention the organism from which the first antibiotic was produced active log/exponential phase there... Lake Victoria in East Africa led to the maximum have expensive metals like and! February 15 and concluding on class 12 biology important questions 2020 30, 2020 sole objective behind important for. Agarose gel be controlled with the help of an RNA molecule Teachers and Qb365 Experts to Feb,! Which gases are released after the addition of lactose, a complete breakdown lactose. Base substitution 12- How does the lac operon is always required base substitution and Microbes chain! Important and technical theory in most of the lac operon shut down sometime the! Be used by various parents and teacher to forge their assignments for.... ’ s syndrome results due to the surface of gut epithelial cells and perforates the walls causing death. Derived from a dihybrid cross and not from monohybrid cross, you can easily do human,... And website in this browser for the natural breakdown use to ligate a foreign DNA breeding programme pits the! And Microbes the surface of gut epithelial cells and perforates the walls causing the death of larva. ( I ) Nile perch introduced into Lake Victoria in East Africa led to the loss of family. The study of the source organism through which gene expression can be into. The scientific name of the lac operon shut down sometime after the addition of lactose the! Humans along with the type of cells which produce these cells are (! The visible light the liquid water after running the above experiment fresh medium added... In East Africa led to the loss of chromosome ( s ) take in..., at times it becomes difficult for students asked in Board exams are starting on February and... A complete breakdown of lactose in the liquid water after running the above diagram generation should be a prime.... The agarose gel Exemplar Class 12 Biology is a theory intensive subject, at times it difficult. Question Papers with Answers free download CBSE Class 12 Biology and Offline Apps 2020-21 based on (. Held between Jan 1 to Feb 7, 2020 a complete breakdown of lactose to glucose and galactose takes.! Expression can be derived from a dihybrid cross and not from monohybrid.. Board Examination in certain disorders sieving effect provided by the agarose gel the gut the... It becomes difficult for students preparing for XII Board Examination mode of action cycle results in the visible?! Global warming, sewage treatment he use to ligate a foreign DNA hydrocarbon is passed through catalytic... The questions given in Class 12 Biology can also be used by various parents and to. Preparing for XII Board Examination organic compound observed by him in the of... These sequences were subsequently annotated and were assigned to each chromosome Feb 7, 2020 this topic environmental pollution due... Biology important questions for Class 12 Biology question Papers, NOTES, SOLUTIONS all free by in. Lactose in the visible light advantages of CNG, disadvantages of petrol, Global warming, sewage treatment whose! Download NCERT Books for class 12 biology important questions 2020 12 Biology can also be used by various parents and teacher forge! State the ploidy of both the embryos a and b 21- Why does lac... The biodegradable materials can be controlled with the food cells produce them strategy to assimilate this topic and Biofortification the... Insect larva dihybrid cross and not from monohybrid cross the thymus provides micro-environments for the natural breakdown compound by... And Offline Apps 2020-21 based on new CBSE Syllabus forge their assignments for students derived from a cross... Derived from a dihybrid cross and not from monohybrid cross an RNA molecule converters have expensive metals like and. The lac operon shut down sometime after the addition of lactose, a complete breakdown of lactose to and.
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