List of top Questions asked in Maharashtra Class XII- 2025

Give the name of endocrine gland which is prominent at birth but gets gradually atrophied in adult stage.
Which cells of islets of Langerhans produce a hormone insulin?
Explain the term Emigration.
What are the reasons for the success of Mendel?
What is the full form of IAA?
How many meiotic divisions are required for the formation of 300 seeds in angiosperm?
Give the name of microbial source of antibiotic chloromycetin.
Arrange the following steps of DNA fingerprinting in correct sequence :

Gel electrophoresis
Isolation of DNA
Southern blotting
Restriction digestion
Which one of the following does not evolve further?
Observe the graph and select correct option :
Which of the following types require pollinator but result is genetically similar to autogamy?
Which of the following is caused by unsterilized needle?
Identify the appropriate term for the number of births under ideal conditions :
Recognition sequence of restriction enzymes are generally ______________ nucleotides long.
Draw a neat and labelled diagram of a lead accumulator cell. Write the overall reactions taking place at cathode and anode during discharging of the cell.
Which of the following divides nasal cavity?
Define a unit cell. Which colour is shown by NaCl crystal due to formation of F-centre? Why does fluorine show anomalous behaviour in ‘17 group’ elements?
State whether entropy change is positive or negative in the following examples : (i) Melting of ice (ii) Vaporisation of a liquid Explain ‘common ion effect’ with example.
Identify the growth hormone in plants which causes inhibitory effect.
An element with molar mass 27 g/mol forms a cubic unit cell with edge length 405 pm. If density of the crystal is g cm\(^{-3}\), identify the type of unit cell. Derive the equation of Raoult’s law for binary solution containing non-volatile solute.
Mention the types of polymers formed on the basis of intermolecular forces. Write any two uses of low density polyethylene.
Write the formula to calculate EAN. Explain formation of [CO(NH\(_3\))\(_6\)]\(^{3+}\) complex ion with respect to : (i) Type of hybridisation (ii) Magnetic property
\( \Delta \)H for formation of ethane gas is \( -84.4 \) kJ at 300 K. Calculate \( \Delta \)U for the reaction.
Calculate spin only magnetic moment of M\(^{2+}\) ion. [atomic number of M = 26] Write condensed electronic configuration of Gadolinium [Z = 64].
Write the reducing agents used to convert Fe\(_2\)O\(_3\) to ‘Fe’ in the reduction zone of blast furnace. Write chemical equations involved in : (i) Carbylamine reaction for ethylamine. (ii) Hoffmann Bromamide degradation for acetamide.