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a] Explain any three directional movemen...

a] Explain any three directional movements in plants.
b] How brain and spinal cord are protected in human?
c] Name the master gland present in the brain.

Text Solution

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a] The movement of plant parts towards or away from the stimuli is called as Tropic Movement.
Phototropism: movement of plant towards or away from the light.
Geotropism: movement of plant parts towards the earth or away from it.
Hydrotropism: movement of plant parts towards or away from any source of water.
b] Both the brain and the spinal cord are protected by bone: the brain by the bones of the skull and the spinal cord is protected by vertebrae.
They have layers of membranes called meninges as well as a special fluid called cerebrospinal fluid. This fluid helps to protect the nerve tissue to keep it healthy, and remove waste products and acts as a shock absorber too.
c] Pituitary gland is known as the master gland.
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