Plants

Question 1

Explain the importance of the mutualistic relationship between legumes and the bacteria n their roots

Answer 1

Bacteria provides nitrates for the plants by nitrogen fixation (converting nitrogen into nitrates). The nitrates provide proteins for growth.

Question 2

What are auxins?

Answer 2

A plant hormone that make some parts of a last grow faster than others

Question 3

What is negative tropism?

Answer 3

Away from the stimulus

Question 4

What is positive tropism?

Answer 4

Towards the stimulus

Question 5

What is phototropism?

Answer 5

Growth in response to the direction of light

Question 6

What is Hydrotropism?

Answer 6

Growth in response to water

Question 7

What is Geotropism?

Answer 7

Growth in response to the direction of gravity

Question 8

What is negative phototropism?

Answer 8

Root tip grows away from the light

Question 9

What effect do auxins have on the roots and shots in relation to speed?

Answer 9

Speed up growth in shoots

Slows down growth in roots

Question 10

What side do auxins diffuse in tip?

Answer 10

The shady side

Question 11

Why do cells growing faster effect the way in which it grows in positive phototropism?

Answer 11

If cells elongate quicker on one side than the other, it will make the plant bend and grow towards the light. Like refraction, the side without auxins is slower.

Question 12

What are tropisms?

Answer 12

Plant response to stimuli

Question 13

What do the auxins do if the light is directly above the plant?

Answer 13

The auxins diffuse evenly, growth same speed in whole shoot

Question 14

Which side do auxins diffuse in the roots in positive geotropism?

Answer 14

The lower side, towards the gravity(ground)

Question 15

Where do auxins diffuse in the roots in positive hydrotropism?

Answer 15

The wetter side, towards the water

Question 16

State uses for plant hormones

Answer 16

Weed killer, the concentrations will only kill weeds
Ripening fruit
Growing plants, root powder

Question 17

Describe uses of plant hormones

Answer 17

Seedless fruit production - fruit develops but not the seeds
Selective weed killer - causes excessive growth of certain weeds, causing them to die
Rooting powder - stimulates root growth, many plants can be grown from one root
Fruit ripening - fruit ripens faster

Question 18

Where is auxin produced?

Answer 18

In the tips of plants

Question 19

What do auxins do in the shoot?

Answer 19

Causes cells on the shaded side to elongate

Question 20

What do auxins do in the root?

Answer 20

Slows the growth in roots