A2 biology plant responses

Question 1

High concentrations of auxins encourage side shoot growth

Accepted Answer

False

Question 2

Which hormone causes the following: Stem elongation, side shoot formation, mobilisation of food stores at germination

Accepted Answer

Gibberellins

Question 3

Auxins always cause growth

Accepted Answer

False

Question 4

Thigmotropism is the tropism to pH

Accepted Answer

False

Question 5

When the apical meristem is removed...

Accepted Answer

... side shoots begin to grow

Question 6

True or false: Auxins always cause growth?

Accepted Answer

False

Question 7

What does ABA do? (Tick 2)

Accepted Answer

Stimulates antifreeze production, Stimulates stomatal closure

Question 8

To cause elongation, auxins cause:

Accepted Answer

pH of cell wall to drop - expansins cause wall to become plastic

Question 9

IAA is a type of auxin

Accepted Answer

True

Question 10

Gibberellins cause what 2 sets of enzymes to be produced in seed germination first? (Tick 2)

Accepted Answer

Amylases, Proteases

Question 11

The critical auxin concentration is smallest in the...

Accepted Answer

... roots

Question 12

Which is the correct definition of a stimulus?

Accepted Answer

Any change in the internal or external environment

Question 13

What systems do plants use to respond to stimuli?

Accepted Answer

Chemical communication

Question 14

H+ ions are protons

Accepted Answer

True

Question 15

What is a positive tropism?

Accepted Answer

Growth towards the stimuli

Question 16

True or false: We can find out what effect a hormone as by creating a null mutant?

Accepted Answer

True

Question 17

The skotomorphogenic response has: (tick 2)

Accepted Answer

lots of gibberellin, Etiolated leaves

Question 18

Which hormone causes fruit ripening?

Accepted Answer

Ethene

Question 19

Auxin maintains apical dominance

Accepted Answer

True

Question 20

gibberellins and auxins are

Accepted Answer

both synergistic and antagonistic

Question 21

Auxin is a blanket term for any chemicals that...

Accepted Answer

... promotes elongation of the stem

Question 22

Why is it important for plants to respond to stimuli?

Accepted Answer

To maintain the optimum internal environment

Question 23

Roots are:

Accepted Answer

Positively geotropic, negatively phototropic

A2 biology plant responses

Questions 23

A2 biology plant responses

Questions 23