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Question : 22
Total: 39
(a) List two differences between the movement of leaves of a sensitive plant and the movement of a shoot towards light.
OR
(b) What happens at synapse between two neurons? State briefly
OR
(b) What happens at synapse between two neurons? State briefly
Solution:
(a)
OR
(b) Transmission of nerve impulses between two neurons takes place through the synapse. A synapse is a gap between the two neurons. At the synapse, the electrical signals are converted into chemicals that can easily cross over the gap and pass on to the next neurons where it is again converted into an electrical signal. Synaptic transmission occurs between the axon terminal of one neuron and the dendrites of another neuron. The jumping of stimulus occurs in the myelinated neurons. An electric signal generates when a stimulus is received.
| Movement of leaves of a sensitive plant | Movement of a shoot towards light |
|---|---|
| This type of movement does not depend on the direction of stimuli. | This movement depends on the direction of light and is known as phototropism. This type of movement is directional and growth development. |
| This type of movement does not depend on the direction of stimuli. | This movement depends on the direction of light and is known as phototropism. This type of movement is directional and growth development. |
(b) Transmission of nerve impulses between two neurons takes place through the synapse. A synapse is a gap between the two neurons. At the synapse, the electrical signals are converted into chemicals that can easily cross over the gap and pass on to the next neurons where it is again converted into an electrical signal. Synaptic transmission occurs between the axon terminal of one neuron and the dendrites of another neuron. The jumping of stimulus occurs in the myelinated neurons. An electric signal generates when a stimulus is received.
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