BOARD QUESTION PAPER : MARCH 2015

Transcription

1 Board Question Paper : March 2015 BOARD QUESTION PAPER : MARCH 2015 Note: i. All questions are compulsory. ii. Answers to Section-I and Section-II should be written in Two Separate answer books. iii. Questions from Section-I attempted in the answer book of Section-II and vice-versa will not be assessed / not be given any credit. iv. Draw neat and labelled diagrams wherever necessary. v. Figures to the right indicate full marks. vi. Answer to every new question must begin on a new page. SECTION I [BOTANY] Q.1. Select and write the most appropriate answer from the given alternatives for each subquestion: [7] i. A cross used to verify the unknown genotype of F 1 hybrid is a cross. (A) test (B) back (C) dihybrid (D) monohybrid ii. iii. iv. Appearance of new combinations in F 2 generation in a dihybrid cross proves the law of. (A) dominance (B) segregation (C) independent assortment (D) purity of gametes A fine powder of recycled modified plastic is known as. (A) polyblend (B) polythene (C) polyester (D) polymer The partially decomposed organic matter is formed by a process called. (A) fragmentation (B) humification (C) mineralization (D) leaching v. Transfer of genetic material into a bacterial cell through a viral vector is known as. (A) transformation (B) transduction (C) transfection (D) translation vi. If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus? (A) 9 (B) 18 (C) 27 (D) 36 vii. Lever mechanism of pollination is observed in. (A) Salvia (B) Jasmine (C) Bougainvillea (D) Butea Q.2. (A) Answer each question in One sentence: (6)[12] i. A pea plant pure for yellow seed colour is crossed with a pea plant pure for green seed colour. In F1 generation, all pea plants were with yellow seed. Which law of Mendel is applicable? ii. Name the enzyme responsible for delay in ripening of tomato fruit. iii. Which are the bacteria responsible for converting organic acids into methane? 229

2 Std. XII Sci.: Perfect Biology I iv. Name the high yielding semi-dwarf varieties of wheat selected and introduced in India in v. Formation of primary endosperm nucleus is called triple fusion. Give reason. vi. Mention any two ecological services for the benefit of mankind. (B) Sketch and label tubular tower fermenter. (2) (C) Answer the following (Any TWO): (4) i. Global warming is caused by greenhouse effect. Justify. ii. With the help of a neat and labelled diagram explain VAM (vesicular arbuscular mycorrhizae). iii. Distinguish between light and dark reactions. iv. Mendel selected the garden pea plants for his experiments. Explain. Q.3. (A) Attempt the following (Any TWO): (6)[9] i. With the help of a neat and labelled diagram describe steps in recombinant DNA technology. ii. What is tissue culture? Describe the methodolgy of tissue culture. iii. Define vegetative propagation. Differentiate between stem tuber and tuberous root. (B) Sketch and label T.S. of angiospermic anther. (3) Q.4. With the help of a neat and labelled diagram describe Watson and Crick s model of DNA. [7] OR With the help of schematic representation explain Kreb s cycle. 230

3 Board Question Paper : October 2015 BOARD QUESTION PAPER : OCTOBER 2015 Note: i. All questions are compulsory. ii. Answers to Section-I and Section-II should be written in Two Separate answer books. iii. Questions from Section-I attempted in the answer book of Section-II and vice-versa will not be assessed / not be given any credit. iv. Draw neat and labelled diagrams wherever necessary. v. Figures to the right indicate full marks. vi. Answer to every new question must begin on a new page. SECTION I [BOTANY] Q.1. Select and write the most appropriate answer from the given alternatives for each subquestion: [7] i. How many meiotic divisions will be needed to produce 44 female gametophytes in angiosperms? (A) 11 (B) 22 (C) 44 (D) 66 ii. If the codon on m-rna is AUG, the compatible anticodon on t-rna is. (A) UAG (B) UAC (C) GUA (D) AUC iii. enzymes are used as biological scissors in r-dna technology. (A) Restriction endonucleases (B) DNA ligases (C) DNA polymerases (D) Reverse transcriptases iv. Vegetative propagation takes place with the help of leaves in plant. (A) Kalanchoe (B) Oxalis (C) Cynodon (D) Dahlia v. Trichoderma konigi is a source of enzyme. (A) invertase (B) lipase (C) pectinase (D) cellulase vi. What is the correct sequence of the stages in bacteriophage lytic cycle? (A) Attachment, Penetration, Lysis, Multiplication (B) Attachment, Penetration, Multiplication, Lysis (C) Lysis, Penetration, Multiplication, Attachment (D) Attachment, Lysis, Multiplication, Penetration vii. Edible fruiting bodies are produced by. (A) Yeast (B) Rhizopus (C) Nostoc (D) Agaricus Q.2. (A) Answer each question in One sentence only: (6)[12] i. Give reason : Emasculation is done in a flower which is selected as female parent. ii. Label the parts (1) and (2) in budding of yeast cell. (2) Nucleus Vacuole (1) 231

4 Std. XII Sci.: Perfect Biology I iii. Enlist types of DNA library. iv. Define parthenocarpy. v. What is meant by ecological succession? vi. Give the role of VAM related to soil fertility. (B) Give diagrammatic representation of pyramid of numbers. (2) (C) Attempt any TWO of the following: (4) i. With the help of a suitable example, explain protandry. ii. How depletion of ozone layer affects living organisms? iii. Give graphic representation of cyclic photophosphorylation. iv. Explain the role of microbes in sewage treatment. Q.3. (A) Attempt any TWO of the following : (6)[9] i. Describe the steps of PCR technique. ii. Write a note on multiple alleles considering example of human blood groups. iii. What is biofortification? Which steps would you follow to develop a new variety of crop plant by selective breeding? (B) Sketch and label the T.S. of undehisced anther. (3) Q.4. Describe the process of glycolysis with the help of schematic representation. [7] OR Explain semi-conservative replication of eukaryotic DNA. 232

5 Board Question Paper : March 2016 BOARD QUESTION PAPER : MARCH 2016 Note: i. All questions are compulsory. ii. Answers to Section-I and Section-II should be written in Two Separate answer books. iii. Questions from Section-I attempted in the answer book of Section-II and vice-versa will not be assessed / not be given any credit. iv. Draw neat and labelled diagrams wherever necessary. v. Figures to the right indicate full marks. vi. Answer to every new question must begin on a new page. SECTION I [BOTANY] Q.1. Select and write the most appropriate answer from the given alternatives for each subquestion: [7] i. The phenotypic ratio of incomplete dominance is. (A) 2 : 1 (B) 1 : 2 : 1 (C) 1 : 1 : 1 (D) 1 : 1 : 2 ii. iii. iv. The number of purines in a segment of DNA molecule is 68. What will be the number of pyrimidines in this segment? (A) 34 (B) 43 (C) 68 (D) 86 Alcoholic fermentation is brought about by. (A) Lactobacillus (B) Saccharomyces (C) Trichoderma (D) Streptomyces Which of the following is not a photosynthetic pigment? (A) Carotene (B) Xanthophyll (C) Phycobillins (D) Anthocyanin v. Which one of the following is a stop codon? (A) UAG (B) UAC (C) AUG (D) UCA vi. vii. Pyruvate undergoes oxidative decarboxylation to produce. (A) 2-PGA (B) -Ketoglutarate (C) Succinyl - Co- A (D) Acetyl - Co - A Which day is observed as World Environment Day? (A) 21 st May (B) 5 th June (C) 25 th September (D) 13 th December Q.2. (A) Answer in One sentence only : (6)[12] i. What is test cross? ii. What is mycoherbicide? iii. What is Anticodon? iv. What is Humification? v. How CO 2 makes idlies puffy? vi. What is ecological succession? 233

6 Std. XII Sci.: Perfect Biology I (B) Sketch and label Ultrastructure of Chloroplast. (2) (C) Answer the following (Any TWO): (4) i. Write a short note on Mutational breeding. ii. Enlist the advantages of Biogas. iii. Explain Carbon cycle. iv. Give the floral adaptations for chiropterophily. Q.3. (A) Answer the following (Any TWO): (6)[9] i. Why the ratio in pleiotropy is 2 : 1? Explain it with example. ii. Give the schematic representation of TCA cycle. iii. Differentiate between cyclic and non-cyclic photophosphorylation. (B) Give diagrammatic representation to show a perfect pairing and any two Wobble pairings. (3) Q.4. What is double fertilization? Describe the process in brief. [7] OR Define r-dna technology. Give the basic steps in r-dna technology and give any three examples of the therapeutic products produced by r-dna technology. 234