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positive phototropism

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12y ago
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1y ago

The stimulus that produces growth of the plant toward light is called phototropism. It is caused by the presence of blue light, specifically light in the 440-470nm wavelength range, which is detected by the plant's photoreceptor molecule called phototropin. This photoreceptor triggers a signaling pathway that stimulates cell elongation on the shaded side of the plant, resulting in growth towards the light source.

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Q: Which of these external stimuli produces growth of the plant toward light?
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What is the meanong of skototropism?

Skototropism is a plant's response to darkness by growing toward it. This is a form of negative phototropism, where the absence of light triggers the plant's growth movement.


Explain how both external and internal stimuli are involved in your action?

External stimuli come from the environment and can influence your actions by triggering responses based on what you see, hear, or feel. Internal stimuli, on the other hand, originate from within your body, such as hunger or pain, and can also lead to behaviors like eating or seeking relief. Together, external and internal stimuli interact to guide your actions in various situations.


What is the secondary meristem that produces wood toward the inside and bark toward the outside of a tree?

The secondary meristem that produces wood toward the inside and bark toward the outside of a tree is called the vascular cambium. It is a lateral meristem responsible for the secondary growth in plants, leading to the formation of secondary xylem (wood) and secondary phloem (bark).


What is response of photo tropism?

Light. Tropisms are growth responses to stimuli. Photo-tropism = light-growth


Why do animals respond quickly to external stimuli?

It's a survival mechanism. Reacting quickly can mean the difference between life and death in some situations (ie- a large boulder rolling down a hill toward an animal; that animal is going to move as soon as they notice the boulder). In other cases, external stimuli could mean something good, like sunlight signalling the beginning of the day and thus the beginning of a diurnal animal's activity period.


What causes a tropism?

Tropisms are caused by directional growth responses of plants to external stimuli like light, gravity, or touch. These responses are controlled by plant hormones, particularly auxins, which regulate cell elongation and growth in response to the specific stimulus. The differential distribution of hormones on one side of the plant compared to the other causes the plant to bend or grow in a particular direction.


What is the secondary meristems that produces wood toward the inside and bark toward the outside of a tree?

vascular cambium


What is the secondary meristem that produces wood toward that inside and bark toward the outside of the tree?

vascular cambium


What is the secondary meristem that produces wood toward the inside and bark toward outside of a tree?

vascular cambium


What is the secondary meristem that produces wood toward that inside and bark toward that outside of a tree?

vascular cambium


What is that secondary meristem that produces wood toward that inside and bark toward that outside of a tree?

vascular cambium


A plant's growth response toward or away from a stimulus is called a?

tropism. Tropisms can result in growth toward (positive) or away from (negative) a stimulus, such as light or gravity.