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

Name the hormone which is responsible for apical dominance.

What is spermatogenesis?

Give reason – Water acts as thermal buffer.

Explain three main functions of free antibodies produced by B-lymphocytes.

Draw a suitable diagram of replication of eukaryotic DNA and label any three parts.

What is a connecting link?

Describe the steps in breathing.

What is composition of bio-gas?

Draw a neat diagram of the conducting system of human heart and label AV node, Bundle of His, and Purkinje fibres.

Differentiate between X-chromosome and Y-chromosome with reference to –
i. Length of non-homologous regions

Define – Incomplete Dominance.

What is ex-situ conservation?

Distinguish between heterochromatin and euchromatin with reference to staining property and activity.

Differentiate between sympathetic and parasympathetic nervous system with reference to the following:
a. Pre and post ganglionic nerve fibres.

Define the terms:
i. Genetic drift

What is biofortification?

Define – Imbibition

Define the terms:
a. Gross Primary Productivity

Complete the following box with reference to symptoms of mineral deficiency:
\begin{tabular}{|c|c|} \hline Symptom & Mineral Deficiency
\hline Pre-mature fall of flowers, fruits and leaves & Abscission
\hline Appearance of green and non-green patches on leaves & Chlorosis
\hline \end{tabular}

Draw a neat diagram of the thyroid gland and label thyroid follicle, follicular cells, and blood capillaries.

Give reason - ABA is also known as an antitranspirant.

Give an example of a plant having both kidney and dumb-bell shaped guard cells in stomata.

Identify the INCORRECT statement.

Mention the name of sterile animal produced by intergeneric hybridisation.