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प्रश्न
Plants do not have any nervous system but yet, if we touch a sensitive plant, some observable changes take place in its leaves. Explain how could this plant respond to the external stimuli and how it is communicated.
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उत्तर
Plants do not have a nervous system like animals but are known to respond to a number of external stimuli with the help of receptors and hormones. The receptors help the plants to sense the external stimulus and act accordingly. As a result of these stimuli, various growth hormones are produced which result in the movement or directed growth of the plant. A similar response is observed when the leaves of Touch-me-not plants are touched. They show seismonastic movement due to the presence of receptors for touch stimulus.
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संबंधित प्रश्न
Draw a flow chart to show the classification of the nervous system into various parts.
Multiple choice question. Tick (✓) the correct choice:
Nervous system in humans consists of
Differentiate between following pair with reference to the aspect in bracket.
sympathetic nervous system and para – sympathetic nervous system (overall effect on body)
Define the following:
Action potential
Explain the term: sensory nerve.
Give Technical Term:
The find cytoplasmic processes of the cell body of a neuron.
Give Technical Term:
The structure which joins the two cerebral hemispheres in man.
The human nervous system is divided into ______ parts.
______ and ______ increases the surface area of cerebrum.
Complete the following table:
| No. | Name of Nerve | Type of Nerve | Function |
| 1. | Optic | ||
| 2. | Facial | ||
| 3. | Hypoglossal | ||
| 4. | Trigeminal | ||
| 5. | Auditory | ||
| 6. | Glossopharyngeal |
