17 Questions
How do auxins promote root growth in plants?
By causing cell elongation through the active transport of hydrogen ions
What is the main function of auxins in maintaining apical dominance?
To inhibit lateral bud growth
How do auxins contribute to phototropism in plants?
By promoting the elongation of cells towards light
What is the role of auxins in cellular metabolism?
Increasing cellular respiration
How do auxins affect the flexibility of cell walls?
By lowering the pH of cell walls
In which process do auxins primarily assist when plants are exposed to light from all directions?
Cell elongation
What is the main purpose of homeostasis in organisms?
To maintain a state of internal dynamic equilibrium
Which of the following is NOT controlled by homeostasis?
Light intensity
What is the role of negative feedback in maintaining homeostasis?
It counteracts any changes in internal conditions
How do hormones affect target organs and cells?
By binding to complementary receptors on plasma membranes
In positive feedback mechanisms, how do responses differ from negative feedback?
Responses amplify the original stimulus
What is the role of auxins when a shoot is illuminated from only one side?
Promote elongation on the shaded side
How do gibberellins stimulate germination?
By triggering the production of amylase in the seed
Which hormone promotes cell division in apical meristems and lateral bud development?
Cytokinins
How do phytochrome levels affect flowering in long-day plants?
Pfr stimulates flowering
What is the relationship between auxins and cytokinins in terms of apical dominance?
Auxins and cytokinins have antagonistic effects on apical dominance
What form of phytochrome exists as the biologically active form, absorbing far red light?
Pfr
Test your knowledge on how hormones bind to receptors on target cells, trigger intracellular reactions, and affect cell metabolism. Learn about the role of second messengers like cAMP in cellular responses.
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