2.6 Hormones and the control of plant growth

Question 1

3 things plants are sensitive to

Answer 1

light, gravity and moisture

Question 2

What is it called when a plant grows towards the light?

Answer 2

phototropism

Question 3

What is it called when a roots grows towards gravity

Answer 3

gravitropism. Roots also grow towards water.

Question 4

What is the hormone which controls phototropism and gravitropism?

Answer 4

Auxin

Question 5

How does auxin control which way roots and stems grow?

Answer 5

Auxin will collect on the side of roots and stems nearest gravity. The root will grow most on the side with lots of auxin, so it will grow down. In stems, the plant will grow most of the side with less auxin, so the stem will grow up (away from gravity)

Question 6

What do plant stems grow towards and away from?

Answer 6

Light, away from gravity

Question 7

What do roots grow towards?

Answer 7

water and gravity.

Question 8

If stems and roots are growing straight up/down how is the auxin distributed in the stems/roots

Answer 8

it is evenly distributed