Hormones Flashcards
plant and animal
what are hormones
a chemical that acts as a messenger in the body, it activates changes in the body
what is tropism
a plant response to a stimulus
what is a stimulus
a change in the environment
what is a positive tropism
when a plant grows towards the stimulus
what are the 2 tropisms and explain each
phototropism - growing up towards light
gravitropism - growing downwards towards the pull of gravity
what is the hormone that creates tropism and what are its effects
auxins - cause plant cells to grown or not grow and change direction
how do auxins make plants grow in different directions
different levels of auxin will be given to different parts of the plant and elongate different lengths
what are the 3 plant hormones
auxins
gibberellins
ethene
what does the gibberellins hormone do
stimulates germinates of seeds
how are gibberellins used commercially
can be used in products to increase crop production and yield
how are weedkillers made using plant hormones
contain auxins, that will get absorbed by the wide-leafed weeds causing them to grow too quickly and die
why are tomatoes transported before they are ripe
it will still be quite hard so it will be less likely to be damaged
what hormone is used to ripen fruits
ethene
compare hormones and nerves
hormones have long-lived effects while nerve effects are over quickly
nerve impulses work quicker while hormones take longer to work
what do you call a gland that produces a hormone
endocrine gland
