Tropism (Types, positive & negative) | Control & Coordination | Biology | Khan Academy
Channel: Khan Academy India - English
Date: 2019-10-02

Let's explore (+ & -) photo, geo, chemo, thigmo, &  hydrotropism. 
More free lessons & practice -https://www.khanacademy.org/science/class-10-biology/in-in-control-and-coordination

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Created by Mahesh Shenoy