Question

biology question 1 ,2,3,4,5 in very short and short​

Answer 1

Answer:

1. Brain and Spinal chord

2. Movement of the plants in response to am external stimulus is called nastic movement. E.g. Opening and closing of stomata. Movement of plant parts in or other direction is called curvature movement. E.g. Release of spores from sporangia.

3. Thyroxine plays a crucial role in heart and digestive function, metabolism, brain development, bone health, and muscle control.

4. A reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus.This is what happens in reflex action - Receptor detects a stimulus(change in the environment)------>Sensory neurone sends signal to relay neuron---->Motor neuron sends signal to effector---->Effector produces the desired response.

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