plant hormones Flashcards
explain how auxin cause shoots to grow straight upwards
auxin created in the tip of the shoot moves to cells below concentration of auxin are equal plants grow through cell elongation both sides grow at the same rate - straight up
define auxins
hormone that controls the growth of roots and shoots
list whether the tropisms have negative or positive effect on the root or shoot
phototropism shoot - positive root - negative hydrotropism shoot - negative root - positive geotropism shoot - negative root - positive
what is a negative tropism
growing away from the stimulus
what is a positive tropism
growing towards a stimulus
name the 3 types of tropisms
photographs.
hydrotropism
gerotropism/gravitropism
list 3 plant responses to hormones
root n shoot growth bud development fruit formation n ripening germination of seeds flowering time flower n leaf fall
what is a tropism
the way a plant responds to a stimulus
explain how auxin make the shoot grow sideways
auxin created in tip of shoot furthest away from the sun
not evenly distributed in cells
continues growing on the side furthest away - bends towards the sun
explain how auxin effect the growth of roots
inhibits growth of the lower side of the roots and the upper side grows faster (and downwards) due to gravity
what equipment can be used to control a plant hormone experiment
clinostat
list the functions of auxin in horticulture and agriculture
rooting powder - aids plant growth
taking cutting to form new plants
weed killer - uncontrollable growth then death
plant tissue cultures - cloning process
list the functions of gibberellins in horticulture and agriculture
brewing industry - end seed dormacy and speed up germination
promote flowering all year round
increases fruit size
increases yield of sugar cane
list the functions of ethene in horticulture and agriculture
control ripening of fruit - speeds process when produce being sold
unripe fruit transported easier - then ethene used to ripen
perfect for sale and attractive to customers
