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Phototropism;
growth curvature in response to direction of light; enables plant shoots to grow and get light
for maximum photosynthesis; allows for leaf mosaic;
Thigmotropism;
growth curvature in response to contact/hard surface; makes plants with weak stems to get
support on large plant/trees; this makes them to reach and get light for maximum
photosynthesis;
Geotropism;
growth curvature in response to gravity; enables plant roots to grow deep into the soil for
maximum support/anchorage;
Hydrotropism;
growth curvature in response to moisture/water; water is then used as a raw material during
photolysis stage of photosynthesis;
Chemotropism;
growth curvature in response to chemical concentration gradient; enables pollen tubes to grow
down the style and into the ovary for fertilization to occur in plant flowers;
Thermotropism;
growth curvature in response to temperature changes; enables plants to grow to where they
can acquire optimum temperature for effective plant process (e.g.sunflower orientates towards
the direction of the sun);
Kavungya answered the question on May 13, 2021 at 13:51
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