Control In Plants

Question 1

Describe the direction that shoots grow in, relating to the things that they are sensitive too.

Answer 1

Gravitropism- In a shoot placed horizontally, the bottom side contains more auxin than the top side. This makes the bottom side grow more than the top side, causing the shoot to bend and grow against the force of gravity.
Sunlight- sunlight causes plants to grow upwards
Phototropisms- In a shoot, the shaded side contains more auxin. This means that the shaded side grows longer, causing the shoot to bend towards the light.

Question 2

Describe the direction that roots grow in, relating to the things that they are sensitive to.

Answer 2

Gravitropisms- In a root placed horizontally, the bottom side contains more auxin than the top side. This makes the bottom side grow less than the top side, causing the root to bend in the direction of the force of gravity.
Moisture and food- wherever there is moisture and food in the ground a root will grow towards it
Phototropism- roots will grow away from the light because the shaded side has more auxins

Question 3

What is the name of the hormone in plants?

Answer 3

Auxins