Gravity.
thigmotropism
A plant that responds to touch is exhibiting thigmotropism. Thigmotropism is a response where a plant changes its growth pattern in response to touch or contact with a solid object.
When plant stems are placed on their sides, a phenomenon called gravitropism occurs. The plant senses the change in gravitational force and redirects its growth to orient itself upright. The stems will grow in the direction of the earth's gravitational pull to reach an upright position.
The plant you are referring to is likely the sensitive plant, also known as Mimosa pudica. It responds to touch by folding its leaves inwards, a response known as thigmonasty.
Reflex Action is the term that describes the way an organism responds to stimuli. It receives stimuli through its senses and reacts with movement, or for a plant growing towards or away.
A plant that responds to light is said to be photosensitive, and it is said to have the property of photosensitivity.
photosynthesis
thigmotropism
A plant that responds to touch is exhibiting thigmotropism. Thigmotropism is a response where a plant changes its growth pattern in response to touch or contact with a solid object.
Thermotropism is when a plant 'moves' as it responds to heat
it wear coats
This change in direction is called gravitropism. Plants respond to gravity by growing roots downward (positive gravitropism) and shoots upward (negative gravitropism). This mechanism helps plants optimize their growth by maintaining stable positions in relation to gravity.
It IS D because it responds to the light.
This is due to a growth hormone called auxin which has a stimuli (affinity) towards light. Thus the plant responds to the stimuli by leaning towards it.
short-day plant
Tendrils responds to plants organs. This a solid object for the plant organs.
The mimosa plant responds to touch by rapidly closing its leaves when touched, a behavior known as thigmonasty.