2 marksShort AnswerSection A

(a) Name one gustatory receptor and one olfactory receptor present in human beings. (b) Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.

Q: (a) Name one gustatory receptor and one olfactory receptor present in human beings. (b) Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.

(a) - **Gustatory receptor:** Tongue (detects taste) - **Olfactory receptor:** Nose (detects smell) (b) In the given flow chart of a neuron, the electrical impulse travels as follows: - **a:** Cell body - **b:** Axon ```diagram {"xrange": [-1.0, 1.0], "yrange": [-10.08, 1.08], "lines": [{"from": [0.0, 0.0], "to": [0.0, -3.0], "label": ""}, {"from": [0.0, -3.0], "to": [0.0, -6.0], "label": ""}, {"from": [0.0, -6.0], "to": [0.0, -9.0], "label": ""}], "points": [{"x": 0.0, "y": 0.0, "label": "Dendrite\n(Acquires information)"}, {"x": 0.0, "y": -3.0, "label": "a\n(Cell Body)"}, {"x": 0.0, "y": -6.0, "label": "b\n(Axon)"}, {"x": 0.0, "y": -9.0, "label": "Axon End\n(Chemical release)"}]} ```

Control and Coordination

Nervous System in Animals

Official Answer

(a)

Gustatory receptor: Tongue (detects taste)
Olfactory receptor: Nose (detects smell)

(b) In the given flow chart of a neuron, the electrical impulse travels as follows:

a: Cell body
b: Axon

Gustatory receptorTongueOlfactory receptorNoseCell bodyAxon

Marking Scheme

10.5 mark for naming Gustatory receptor (Tongue / taste buds)
20.5 mark for naming Olfactory receptor (Nose / olfactory epithelium)
30.5 mark for identifying 'a' as Cell body
40.5 mark for identifying 'b' as Axon

Hint

Think about the sense organs associated with taste and smell. For the flow chart, recall the pathway of an electrical impulse starting from the dendritic tip to the nerve ending.

Quick Oral Answer

Gustatory receptors detect taste and are located on the tongue, while olfactory receptors detect smell and are located in the nose. In a neuron, the electrical impulse travels from the dendrite to the cell body, and then along the axon to the nerve ending.

Analysis & Explanation

According to the NCERT textbook, all information from our environment is detected by the specialized tips of some nerve cells called receptors. Gustatory receptors are located in our tongue and are responsible for detecting taste, while olfactory receptors are located in our nose and detect smell.

When information is acquired at the dendritic tip of a neuron, it sets off a chemical reaction that creates an electrical impulse. This impulse travels from the dendrite to the cell body (a), and then along the axon (b) to its end, where it is converted into a chemical signal (neurotransmitters) to cross the synapse.

Common Mistakes

1Confusing gustatory (taste) with olfactory (smell).
2Writing the pathway in reverse order (e.g., Axon -> Cell body -> Dendrite).

Interesting Facts

The human tongue has about 2,000 to 8,000 taste buds, and they are replaced every one to two weeks!

Olfactory receptors can detect thousands of different odors, which is why food tastes bland when you have a blocked nose.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2018?

This question carries 2 marks in the CBSE Class 10 Science 2018 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Control and Coordination" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Nervous System in Animals" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2018 paper?

This is a Short Answer question from Section A in the CBSE Class 10 Science 2018 paper.