List of top Biology Questions asked in Maharashtra Board Class XII Exam

Interpret the given diagrams A and B. Enlist the changes occurring during inspiration and expiration.
Describe physiological effects and applications of ethylene.
What are chromosomal disorders? Describe Turner's syndrome and Klinefelter's syndrome.
Describe pyramid of energy with the help of diagram.
Explain following terms : (a) Grafting \quad (b) Apomixis \quad (c) Polyembryony \quad (d) Parthenocarpy
Give the name and type of I, IV and VII cranial nerves.
Describe histological structure of Testis with well labelled diagram.
Describe nervous system in planaria with well labelled diagram.
Explain green house effect with reference to gases responsible for it and their sources.
What is lac? Enlist economic importance of Lac.
Explain different steps involved in PCR technique.
Identify A, B, and C from the above diagrams and give their functions.
What is reproductive isolation? Describe any two types each of pre-mating and post-mating isolating mechanism.
Name and describe hormones secreted by ovaries.
Explain the steps involved in preliminary treatment of sewage.
Explain unique features of acquired immunity.
What are the limitations of root pressure theory?
Give the different steps involved in formation of m-RNA from hn-RNA.
Identify and define 'A' and 'B' in relation to uptake of water by the root :
Select and rewrite appropriate disorder of respiratory system with the given symptoms : [ sinusitis, emphysema, silicosis and asbestosis, laryngitis ]
What are the significances of double fertilization?
What is differentiation and redifferentiation?
Enlist the uses of gene therapy.
Distinguish between human sperm and ovum.
Explain factors affecting water absorption.