Give reasons for the following:

Nerve impulse travels in one direction due to change in voltage difference during conduction and due to the secretion of acetylchloride at symaptic cleft.

Mention the most significant function of each of the following:

Serotonin

Give one difference between each of the following:

 Glucocorticoids and Mineralocorticoids.

Give reasons for the following

A person has difficulty in focusing on nearer objects, as the age increases.

Mention the most significant function of each of the following:

Lenticels  

Give reasons for the following

A cut plant wilts fast even if its cut end is dipped in water.

Give one difference between each of the following:

Antibodies and Interferons.

Give reasons for the following

 Urine excreted during summer months is hypertonic.

Give reasons for the following

Jamming of wooden doors and windows takes place during rainy season.

Mention the most significant function of each of the following:

Cerebrospinal fluid