Growing of plants in response to earth's gravity is called ______.
Fill in the following blanks:
(a) A plant's response to light is called .................
(b) A plant's response to gravity is called .................
(c) Plant shoot grow upward in response to ..............
(d) Plant roots grow downward in response to .............
(e) Tendrils wind around a support in response to ..........
(f) Plant roots grow towards .......... and in the direction of force of ...............
(g) A root of a plant grows downward. This is known as ..............
(h) ........... is the hormone that causes phototropism in plants
(i) The response of leaves to the sunlight is called ..............