‘Hydrotropism’ is the directional growth response of plants towards or away from water, and ‘chemotropism’ is the response to chemicals. An example of chemotropism is the growth of pollen tubes towards ovules.
Define ‘hydrotropism’ and ‘chemotropism’ and provide an example of chemotropism mentioned in the paragraph.
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Hydrotropism is a plant’s directional growth response toward or away from water. Plant roots exhibit positive hydrotropism, growing towards a water source to enhance water absorption. In contrast, chemotropism is the growth or movement of a plant part in response to a chemical stimulus. An example of chemotropism is the pollen tube’s growth towards ovules in the ovary, guided by chemical signals. The pollen tube navigates through the style, reaching the ovule for fertilization. Chemotropism ensures precise reproductive processes by directing plant structures towards specific chemicals essential for successful reproduction.