Question

Analyse the process of taste detection and choose the correct sequence of steps from the options given:
Steps:
(i) Substances dissolve in saliva.
(ii) Nerves carry impulses to brain.
(iii) Chemoreceptors generate impulses.
(iv) Substances reach the minute pores in the papilla.

• A. (iii), (ii), (i), (iv)
• B. (ii), (i), (iii), (iv)
• C. (i), (iv), (iii), (ii)
• D. (i), (iii), (ii), (iv)

Hint:

Taste perception always begins with dissolution in saliva and ends with nerve impulses reaching the brain.

Answer 1

The Correct Option is C

Step 1: Understanding initial process.
Taste detection starts when food substances dissolve in saliva. This is necessary because taste receptors can only detect chemicals in dissolved form.
Step 2: Movement towards receptors.
After dissolving, the substances reach the minute pores present in the papilla (taste buds) on the tongue. These pores allow the dissolved chemicals to interact with sensory cells.
Step 3: Generation of impulses.
The chemoreceptors present in the taste buds get stimulated by these dissolved substances and generate nerve impulses.
Step 4: Transmission to brain.
Finally, the nerves carry these impulses to the brain, where the sensation of taste is perceived.
Step 5: Conclusion.
Thus, the correct sequence is (i) → (iv) → (iii) → (ii).