24.3 Plant Hormones
Terms in this set (18)
chemical signals that affect a plant's growth, activity, and development as well as the way a plant responds to its environment
cells in an organism affected by a particular hormone
proteins to which hormones bind that cause response to a hormone
hormone that control cell elongation and the growth of new roots, produced by apical meristems, then travel to the rest of the plant
what located at the tips of stems inhibits the growth of other buds and causes slower growth. As a result, when tips are trimmed the buds will grow more quickly.
hormones produced in growing roots, fruits, and seeds, cause cell division, do the opposite of auxins (inhibits growth rather than stimulates)
hormones that promote growth, can produce great increases in size. Stimulates germination.
Hormone that stops cells from dividing, works with Gibberellins to control seed dormancy.
Hormone that is a gas. Helps ripen fruits. Causes plants to drop organs that are no longer needed.
Plant hormones serve as signals that control development of cells, tissues, and organs. They also control responses to the environment. The opposing effects of plant hormones balance each other, contributing to a plant's homeostasis.
What roles do plant hormones play?
the movement of a plant towards or away from a stimulus.
the response of a plant to light.Changes in auxins responsible for this.
the response of a plant to the force of gravity. Causes stems to bend upright
the response of a plant to touch. Vines are an example, when they encounter an object, they wrap around it.
the relative lengths of light and darkness that affect a plant's response
Plants respond to environmental stimuli such as light, gravity, and touch.
What are some examples of environmental stimuli to which plants respond?
Photoperiod is a major factor in the timing of seasonal activities such as flowering and growth.
How do plants respond to changes in day length?
As cold weather approaches, deciduous plants stop photosynthesis. They move materials from leaves to roots and seal off leaves from the rest of the plant.
How do plants respond to cold winters?