plant responses

Question 1

auxin stimulates…

Answer 1

newly formed cells to get longer

Question 2

where is auxin produced?

Answer 2

the ends of shoots where it can diffuse down the stem

Question 3

auxin causes…

Answer 3

phototropism

Question 4

phototropism

Answer 4

young stems bend towards light

Question 5

____ inhibits auxin transport

Answer 5

light

Question 6

auxin elongates cells on___ side

Answer 6

dark

Question 7

phototropism bends stem toward…

Answer 7

light

Question 8

how is phototropism used to kill weeds?

Answer 8

makes weeds grow too much unitil they die

Question 9

cytokinin encourages

Answer 9

cell division

Question 10

where is cytokinin produced?

Answer 10

in the roots

Question 11

cytokinin stimulates

Answer 11

branch formation

Question 12

primary apical meristem inhibits..

Answer 12

branch formation

Question 13

auxin suppresses ______ from…

Answer 13

auxiliary buds from forming branches

Question 14

tip of tree produces auxin which is why…

Answer 14

the top of trees have much smaller branches than the bottom of the tree.

Question 15

cytokinin stimulates…

Answer 15

axillary buds to form branches

Question 16

___ of tree produces cytokinin

Answer 16

bottom

Question 17

levels of ___ and ___ determine branch growth

Answer 17

auxin and cytokinin

Question 18

gibberellin stimulates

Answer 18

cell division and cell elongation

Question 19

what especially helps fruit grow bigger?

Answer 19

gibberellin

Question 20

gibberellin is released by

Answer 20

embryo to stimulate germination

Question 21

abscisic acid prevents …

Answer 21

seed from germinating

Question 22

what prevents seed from sprouting in the fruit?

Answer 22

abscisic acid

Question 23

ethylene gas helps sprouts

Answer 23

avoid obstacles

Question 24

ethylene gas: triple response

Answer 24

o Grows slower
o Becomes thicker and stronger
o Grows horizontally

Question 25

leaf abscission

Answer 25

dropping leaves (like in the fall)

Question 26

______ helps fruit ripen

Answer 26

ethylene gas

Question 27

how do plants detect light?

Answer 27

with phytochrome pigments red: activates them darkness: inactivates them

Question 28

plants open stomata during...

Answer 28

day and close them at night

Question 29

short day plants flower in the

Answer 29

fall

Question 30

short day plants flower when nights...

Answer 30

become LONG enough

Question 31

short day plants seeds overwinter in the soil and ..

Answer 31

sprout the next spring

Question 32

land day plants flower in the

Answer 32

spring

Question 33

long day plants flower when night becomes

Answer 33

short enough

Question 34

long day plants seeds may

Answer 34

sprout immediately or over winter

Question 35

positive tropism

Answer 35

plant grows toward stimulus

Question 36

negative tropism

Answer 36

plant grows away from stimulus

Question 37

common tropisms include

Answer 37

Phototropism, Gravitropism, Thigmotropism

Question 38

phototropism: shoots have positive phototropism

Answer 38

grows toward light source enabled by auxin which is inhibited by light

Question 39

phototropism: roots have negative phototropism

Answer 39

grow away form light source

Question 40

gravitropism: shoots have negative gravitropism

Answer 40

shoots grow away from gravity

Question 41

gravitropism: roots have positive gravitropism

Answer 41

roots grow toward gravity

Question 42

negative thigmotropism

Answer 42

most plants grow away from touch

Question 43

positive thigmotropism

Answer 43

they hold on to larger plants for support

Question 44

example of positive thigmotropism

Answer 44

vines: reach tendril stems toward touching object