Plants

Question 1

What does auxin control?

Answer 1

The growth of a plant in response to light (phototropism) , gravity (gravitropism/geotropism) , and moisture

Question 2

Where is auxin produced?

Answer 2

In the tips

Question 3

What happens if the tip of a shoot is removed?

Answer 3

No auxin is available and the shoot may stop growing

Question 4

What happens when a shoot tip is exposed to light?

Answer 4

More auxin accumulates on the side that’s in the shade that the side that’s in the light so that the cells grow faster in the shaded side, so the shoot grows towards the light

Question 5

How do shoots react to gravity?

Answer 5

They grow away from it. When a shoot is growing sideways, gravity produces and unequal distribution of auxin in the tip, with more auxin in the lower side. This causes the tip to grow faster, shooting upwards

Question 6

What does auxin do to growth in a plants roots?

Answer 6

It inhibits growth

Question 7

How do roots react towards gravity?

Answer 7

Roots grow towards gravity. In a root, the extra auxin inhibits growth which means the cells on the top elongate faster and the root bends downwards

Question 8

How do roots respond to moisture?

Answer 8

Roots grow towards moisture. An uneven amount of moisture on either side of the root produces more auxin on the side with more moisture. This inhibits growth on that side cause the root to bend towards the moisture

Question 9

What are the uses of plant hormones in agriculture?

Answer 9

1. Most weeds in crop fields are broad leaves. Selective weedkillers are made of plant growth hormones and only affect broad leaves plants. They disrupt their natural growth patterns, killing the weeds but leaving crops untouched as they have narrow leaves
2. Plant cuttings won’t always grow in soil. If you add rooting powder, which contains auxin, they’ll produce roots rapidly and start growing as new plants