Exploring plant responses to environmental cues, this overview delves into tropisms, photoreceptors, and hormones like auxin and gibberellin. It examines how plants use these mechanisms to optimize growth, respond to light and gravity, and cope with water scarcity. The roles of phytochromes in development and the strategies plants employ for survival, such as apical dominance and leaf abscission, are also discussed.
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Plants grow towards light to optimize photosynthesis
Roots grow downward and shoots grow upward to access resources
Plants delay seed germination and close stomata to conserve water
These proteins detect blue light and regulate phototropism, stomatal opening, and chloroplast movements
These proteins detect red and far-red light and regulate processes such as stem elongation and seed germination
This hormone promotes cell elongation and orchestrates phototropism
This hormone stimulates seed germination by breaking down starch into sugars
This hormone inhibits germination and prompts stomatal closure during drought conditions
The main stem suppresses the growth of lateral buds and stems, ensuring upward growth towards light
Environmental cues, such as changing seasons, trigger the shedding of leaves through the formation of an abscission layer
00
To adapt to dry environments, plants can postpone ______ and shut their ______ to reduce water loss.
seed germination
stomata
01
Phototropins' sensitivity
Sensitive to blue light, regulate phototropism, stomatal opening, chloroplast movement.
02
Phytochromes' light absorption
Absorb red and far-red light, control stem elongation, seed germination, light quality detection.
