PLANTS
PLANT RESPONSES TO STIMULI
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Sun passing through the sky.
|
|
|
Daily rainfall patterns.
|
|
|
Daily rise and fall in temperature.
|
|
|
Physical contact with passing animals.
|
Detailed explanation-1: -The flowers of the snow buttercup (Ranunculus adoneus) face one direction in the morning, move throughout the day, and face the other way be evening. Most likely this is a response to which stimulus? Sun passing through the sky.
Detailed explanation-2: -Plant roots always grow downward because specialized cells in root caps detect and respond to gravity. This is an example of a tropism. A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism.
Detailed explanation-3: -Plants produce hormones in response to external stimuli. They exhibit this by tropism in which they grow towards sources of water and light. In positive tropism, plants grow in the direction of stimulus and in negative tropism plants grow in the direction opposite to stimulus.
Detailed explanation-4: -The plant responds to many types of external stimuli such as light, gravity, weather, and touch. The response of a plant is either positive (grow towards the stimulus) or negative (grow away from the stimulus). For example, phototropism is the plant’s response to stimulus, i.e. sunlight.