Choose the correct :

Options

A. Nociceptors respond to changes in pressure
B. Meissner's corpuscles are thermoreceptors
C. Photreceptors n human eye are deopola rised during darkness and become hyperplarised in response to the light stimulus
D. Receptors do not produce graded potentials

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks us to choose the correct statement among four given options related to receptors and their functions.

2. **Analyzing the First Option**: The first statement claims that "Nose receptors respond to change in pressure."
- **Evaluation**: This is incorrect. Nose receptors, particularly olfactory receptors, are primarily responsible for detecting smell, not pressure changes. They are not pain receptors as stated in the transcript.

3. **Analyzing the Second Option**: The second statement says "Mason's corpuscles are thermoreceptors."
- **Evaluation**: This is also incorrect. Mason's corpuscles (or Meissner's corpuscles) are mechanoreceptors that respond to light touch and pressure, not temperature changes.

4. **Analyzing the Third Option**: The third statement states that "Photoreceptors in human eyes depolarize during darkness and become hyperpolarized in response to light stimulus."
- **Evaluation**: This statement is correct. In darkness, photoreceptors depolarize due to the influx of sodium ions, while in light, they hyperpolarize because the sodium channels close when cyclic GMP levels decrease.

5. **Analyzing the Fourth Option**: The fourth statement claims "Receptors do not produce graded potential."
- **Evaluation**: This is incorrect. Receptors do produce graded potentials, which are changes in membrane potential that occur in response to stimuli.

6. **Conclusion**: After evaluating all four options, the only correct statement is the third one: "Photoreceptors in human eyes depolarize during darkness and become hyperpolarized in response to light stimulus."

### Final Answer:
The correct option is: **C - Photoreceptors in human eyes depolarize during darkness and become hyperpolarized in response to light stimulus.**

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