Control in Plants

Question 1

What are the different tropisms?

Answer 1

phototropism - shoots grow towards light

gravitropism - roots grow in the direction of gravity, shoots grow in the opposite direction

hydrotropism - roots grow in direction of mosture

Question 2

What controls growth in plants?

Answer 2

Auxins:

• plants bend towards light due to an uneven distribution of auxins.
• plant growth hormones are used in agriculture as rooting hormones and weed killers