HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Important Questions for Biology

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

Describe the steps in breathing.

Differentiate between an artery and a vein with reference to lumen and thickness of wall.

Give reason:

Lymphatic vessels are milky in appearance.

Give reason:

The wall of left ventricle is thicker than right ventricle

Give reason:

Valves are present in the veins.

Give reason:

Pulmonary veins carry oxygenated blood.

Which of the following divides nasal cavity?

Select and rewrite the appropriate disorder of the respiratory system with the given symptom.

Breakdown of alveoli, shortness of breath.

Select and rewrite the appropriate disorder of the respiratory system with the given symptom.

Inflammation of the sinuses, mucous discharge.

Select and rewrite the appropriate disorder of the respiratory system with the given symptom.

Inflammation of larynx, vocal cord, sore throat, hoarseness of voice, mucous build up and cough.

Select and rewrite appropriate disorder of respiratory system with the given symptom.

Inflammation of fibrosis, lung damage.

Interpret the given diagrams A and B. Enlist the changes occuring, during inspiration and expiration.

Describe T.S. of the spinal cord.

Define Endocrine gland

add a note on deficiency of thyroxine.

Which of the following is a chemical transmitter in the synapse of neurons?

A person suffering from diabetes insipidus shows __________.

Photoreceptor cells are present in __________.

(A) blind spot

(B) retina

(C) cochlea

(D) cornea

The catecholamines are secreted by _________.