Maharashtra HSC Class 12 Biology March 2024 question paper

Maximum marks 70 · Time 3 hours

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Section A

1 mark each

Q.1 (i)1 mark $Identify the growth hormone in plants which causes inhibitory effect.$
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Q.1 (ii)1 mark $Which one of the following is not a part of lac operon?$
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Q.1 (iii)1 mark $In absence of fertilization, corpus luteum degenerates into _____.$
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Q.1 (iv)1 mark $Which of the following divides nasal cavity?$
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Q.1 (v)1 mark $Which of the following is caused by unsterilized needle?$
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Q.1 (vi)1 mark $Recognition sequence of restriction enzymes are generally _____ nucleotides long.$
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Q.1 (vii)1 mark $Which of the following types require pollinator but result is genetically similar to autogamy?$
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Q.1 (viii)1 mark $Which one of the following does not evolve further?$
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Q.1 (ix)1 mark $Identify the appropriate term for the number of births under ideal conditions :$
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Q.1 (x)1 mark $Observe the graph and select correct option :$
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Q.2 (i)1 mark $What are vestigeal organs?$
Q.2 (ii)1 mark $Expand the term ZIFT.$
Q.2 (iii)1 mark $Give the name of endocrine gland which is prominent at birth but gets gradually atrophied in adult stage.$
Q.2 (iv)1 mark $What is the full form of IAA?$
Q.2 (v)1 mark $Give the name of microbial source of antibiotic chloromycetin.$
Q.2 (vi)1 mark $Which cells of islets of Langerhans produce a hormone insulin?$
Q.2 (vii)1 mark $How many meiotic divisions are required for the formation of 300 seeds in angiosperm?$
Q.2 (viii)1 mark $Explain the term Emigration.$

Section B

2 marks each · attempt any 8

Q.32 marks $What are the reasons for the success of Mendel?$
Q.42 marks $Arrange the following steps of DNA fingerprinting in correct sequence : (a) Gel electrophoresis (b) Isolation of DNA (c) Southern blotting (d) Restriction digestion$
Q.52 marks $Distinguish between human sperm and ovum.$
Q.62 marks $Enlist the uses of gene therapy.$
Q.72 marks $Define the following terms : (a) Gene flow (b) Chromosomal aberrations$
Q.82 marks $What are the significances of double fertilization?$
Q.92 marks $Identify and define ‘A’ and ‘B’ in relation to uptake of water by the root :$
Q.102 marks $Describe mutualism.$
Q.112 marks $Explain factors affecting water absorption.$
Q.122 marks $What is differentiation and redifferentiation?$
Q.132 marks $Select and rewrite appropriate disorder of respiratory system with the given symptoms : [ sinusitis, emphysema, silicosis and asbestosis, laryngitis ] (a) Breakdown of alveoli, shortness of breath. (b) Inflammation of the sinuses, mucous discharge. (c) Inflammation of larynx, vocal cord, sore throat, hoarseness of voice, mucous build up and cough. (d) Inflammation of fibrosis, lung damage.$
Q.142 marks $Explain the steps involved in preliminary treatment of sewage.$

Section C

3 marks each · attempt any 8

Q.153 marks $Give the different steps involved in formation of m-RNA from hn-RNA.$
Q.163 marks $What is reproductive isolation? Describe any two types each of pre-mating and post-mating isolating mechanism.$
Q.173 marks $Explain unique features of acquired immunity.$
Q.183 marks $Name and describe hormones secreted by ovaries.$
Q.193 marks $Explain different steps involved in PCR technique.$
Q.203 marks $Identify A, B, and C from the above diagrams and give their functions.$
Q.213 marks $What are the limitations of root pressure theory?$
Q.223 marks $Explain green house effect with reference to gases responsible for it and their sources.$
Q.233 marks $Describe physiological effects and applications of ethylene.$
Q.243 marks $Give the name and type of I, IV and VII cranial nerves.$
Q.253 marks $Describe pyramid of energy with the help of diagram.$
Q.263 marks $What is lac? Enlist economic importance of Lac.$

Section D

4 marks each · attempt any 3

Q.274 marks $Describe histological structure of Testis with well labelled diagram.$
Q.284 marks $What are chromosomal disorders? Describe Turner’s syndrome and Klinefelter’s syndrome.$
Q.294 marks $Describe nervous system in planaria with well labelled diagram.$
Q.304 marks $Explain following terms : (a) Grafting (b) Apomixis (c) Polyembryony (d) Parthenocarpy$
Q.314 marks $Interpret the given diagrams A and B. Enlist the changes occuring during inspiration and expiration.$