Movements in Plants Class-10th

Learning Objectives After completing this lesson ,students will able to – Define plant movements. List various types of movements in plants. Explain various types of movements in plants.

Movements in plants Tropic-Movement Nastic Movement Plants show many types of movements. Movements in plants are of two main types. They are :-Tropic movements and Nastic movements. Tropic-Movement Nastic Movement

Tropic movements Tropic movements are directional movements towards or away from the stimulus and it depends on growth. Tropic movements in plants are as follows. (Click on buttons) Photo-tropism Thigmotropism Geo-Tropism & Hydro-tropism Chemotropism Back

Phototropism It is movement of plants in response to light. If it is towards light, it is called positive phototropism. Eg:- Bending of shoot towards light. If it is away from light, it is called negative phototropism. Eg:- Bending of root away from light. Back

GEOTROPISM Hydrotropism Geotropism :- It is the movement of plants in response to gravity . If it is towards gravity it is called positive geotropism. Eg:- Downward growth of roots If it is away from gravity it is called negative geotropism. Eg:- Upward growth of shoot. Hydrotropism It is the movement of plants in response to water. Eg :- Growth of roots towards water. Back

It is movement of plant in response to chemical stimuli. Chemotropism It is movement of plant in response to chemical stimuli. Eg:- Growth of pollen tube towards the ovule. Back

Thigmotropism

Nastic movements These are non directional movements and unaffected by direction of stimulus. Eg :- If we touch the leaves of “Touch me not plant”, its leaves fold up and droops down immediately due to the change in the amount of water in the leaves. Depending upon the amount of water in the leaves, it swells or shrinks. Exercise

Multiple –choice -questions Q1-Root shows…………………………..movements. Geotropism Hydrotropism Negative Phototropism All of the above Q2-Which movements is shown by pollen –tube in plants ? Chemotropism Hydrotropism Nastic movement Photo tropism Q 3-Movements shown by stem of plants is/are…………….. Positive Phototropism Negative geotropism Both None of the above A B D C A B D C A B D C Answers

Multiple –choice -questions Q1-Root shows…………………………..movements. Geotropism Hydrotropism Negative Phototropism All of the above Q2-Which movements is shown by pollen –tube in plants ? Chemotropism Hydrotropism Nastic movement Photo tropism Q 3-Movements shown by stem of plants is/are…………….. Positive Phototropism Negative geotropism Both None of the above A B D C A B D C A B D C

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