Give one example of a plant part that is positively phototrophic as well as negatively geotropic. (Root/Shoot)

Which of the following is a growth movement and which is not?

a) folding up of leaves of the sensitive plant on touching with hand.

b) folding of petals of a dandelion flower when the light fades. 

To which directional stimuli does the shoot respond?

Fill in the blank with the options provided in the bracket.

Plant shoot grows upward in response to _____ (water, touch, light).