Give scientific reason :We are able to understand the smell of the fir

1.	Give scientific reason :We are able to understand the smell of the first showers of rain or the sudden changes in the climate.
Answer» 1. We are able to understand any smell because of our olfactory mucosa and olfactory lobes of the brain. 2. Volatile substances are received by the olfactoreceptors in the nose. 3. Nerve impulse generated are carried by olfactory nerve and transmitted to brain where the impulse is interpreted. 4. The characteristic earthy smell is due to a compound ‘geosmin’. 5. Geosmin is produced by some species of Streptomyces [ gram positive soil bacterium], 6. Similarly, sudden change in the climate is easily noticed in the form of temperature change in the surrounding. 7. This change is detected by caloreceptors of the skin. From these receptors the signal is transmitted to CNS where the change is perceived.

Give scientific reason :We are able to understand the smell of the first showers of rain or the sudden changes in the climate.

Answer»

1. We are able to understand any smell because of our olfactory mucosa and olfactory lobes of the brain.

2. Volatile substances are received by the olfactoreceptors in the nose.

3. Nerve impulse generated are carried by olfactory nerve and transmitted to brain where the impulse is interpreted.

4. The characteristic earthy smell is due to a compound ‘geosmin’.

5. Geosmin is produced by some species of Streptomyces [ gram positive soil bacterium],

6. Similarly, sudden change in the climate is easily noticed in the form of temperature change in the surrounding.

7. This change is detected by caloreceptors of the skin. From these receptors the signal is transmitted to CNS where the change is perceived.