Question

Differentiate between

(a) Tropic Movements and Nastic Movement 

(b) Nervous control and Hormonal control in animals

Answer 1

(a)

Tropic Movements	Nastic Movements
1.Direction of response external stimuli is related to the direction of stimulus	Non-directional growth movements.
2.These are curvature movements that occur due to changes in orientation in plant parts in relation to other like bending, twisting and elongation	These are turgor movements caused mainly due to loss or gain of turgidity.
3.Stimulus is generally unilateral eg. Phototropisn, chemotropism etc.	Stimulus is generally diffused eg. Seismonasty, epinasty etc.

(b)

Nervous control	Hormone control
1.It is rapid	It is comparatively slow
2.It takes place through electrical signals called nerve impulses	It take place through the transportation and action of hormones.
3.Nerve impulses travel in specific direction	Hormonal control is not related to any particular direction