KERALA PSC / BIOLOGY / PLANT MOVEMENTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

 

KERALA PSC / BIOLOGY / PLANT MOVEMENTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

KERALA PSC / BIOLOGY / PLANT MOVEMENTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

·      Two types of movements are noted in plants. (1) Growth movements (irreversible) (2) Turgor movements (reversible)

·      Plants exhibits movements in response to external stimulus like touch, light gravitation, water etc…

·      Chemical stimulus induced growth is called chemotropism

·      Bending of stem towards light is due to phototropism

·      Phototropism means movements of plants towards light

·      The movement of plant organs in response to the force of gravity is called as geotropism

·      The movement of an organ induced by contact with a foreign body is called haptotropism

·      Water stimulus induced growth movements are called hydrotropism

·      The curvature movements of plant parts in response to the stimulus of contact are termed as thigmotropism

·      Growth movements in response to the stimulus of heat or cold is called thermotropism

·      Alternation of day and night causes movements of plants called nyctinastic movements.

·      Seismonastic movements are in response to a touch or shock stimulus.

KERALA PSC / BIOLOGY / PLANT MOVEMENTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY