List of top Biology Questions asked in Maharashtra Class XII

What are vestigeal organs?
What is reproductive isolation? Describe any two types each of pre-mating and post-mating isolating mechanism.
Which one of the following is not a part of lac operon?
In absence of fertilization, corpus luteum degenerates into ____________.
Select and rewrite appropriate disorder of respiratory system with the given symptoms : [ sinusitis, emphysema, silicosis and asbestosis, laryngitis ]
Expand the term ZIFT.
Interpret the given diagrams A and B. Enlist the changes occurring during inspiration and expiration.
What are chromosomal disorders? Describe Turner's syndrome and Klinefelter's syndrome.
Describe nervous system in planaria with well labelled diagram.
Explain green house effect with reference to gases responsible for it and their sources.
Describe histological structure of Testis with well labelled diagram.
What is lac? Enlist economic importance of Lac.
Describe pyramid of energy with the help of diagram.
Give the name and type of I, IV and VII cranial nerves.
Explain following terms : (a) Grafting \quad (b) Apomixis \quad (c) Polyembryony \quad (d) Parthenocarpy
Describe physiological effects and applications of ethylene.
Explain unique features of acquired immunity.
Explain different steps involved in PCR technique.
Name and describe hormones secreted by ovaries.
Explain the steps involved in preliminary treatment of sewage.
What are the limitations of root pressure theory?
Identify A, B, and C from the above diagrams and give their functions.
Give the different steps involved in formation of m-RNA from hn-RNA.
What are the significances of double fertilization?
Distinguish between human sperm and ovum.