A scientist plants seedlings in different conditions to demonstrate how plants respond to their environment. Which of these observations provides evidence of gravitropism?
The seedlings growing in a curved pattern, with the stems bending towards the ground.
a. Seedlings planted in containers that are tipped over sideways grow sideways.
b. Seedlings planted in containers that are tipped over sideways extend their roots downward.
c.
Seedlings planted near a stick wrap around the stick.
d. Seedlings planted away from a source of sunlight grow toward the light.
(for the bot)
a. Seedlings planted in containers that are tipped over sideways grow sideways.
To determine if there is evidence of gravitropism, you would need to observe how the plants respond to the force of gravity. Gravitropism refers to the growth or movement of organisms in response to gravity. Specifically, it can be observed in plants as the roots growing downwards (positive gravitropism) and the shoots growing upwards (negative gravitropism).
To conduct an experiment to demonstrate gravitropism, you can set up different conditions for the seedlings. For example, you can place some seedlings horizontally or at an angle, while others can be grown upright. By observing how the seedlings respond to gravity, you can determine if there is evidence of gravitropism.
In this specific scenario, the observation that would provide evidence of gravitropism is if the roots of the seedlings grow downwards. If the roots of the seedlings grow in the direction of gravity, regardless of how the plant is positioned, it demonstrates positive gravitropism. This is because roots are typically positively gravitropic and will grow towards the force of gravity.