Plants & Food Webs Flashcards
What is phototropism?
Movement or growth in response to light
What is geotropism?
Movement or growth in response to gravity
What is thermotropism?
Movement or growth in response to temperature
What is thigmotropism?
Movement or growth in response to contact or touch
What is hydrotropism?
Movement or growth in response to water
What is chemotropism?
Movement or growth in response to chemicals
Describe two advantages of using hormones to control fruit ripening
Won’t over ripen
Make bigger fruit
Why is rooting powder used by some plant growers?
It’s cheap and quick and all plants will be identical
Why should you use plant hormones to control weeds in a field of crops?
So that the weeds won’t take all the nutrients and the crops will grow better
What is used to ripen fruit and when is it given off?
Ethene is used to ripen fruit and it is given off by already ripe fruit
How much energy is transferred from one trophic level to the next?
Only 10%
Why does the energy decrease as it is transferred from one trophic level to the next?
Because animals loss energy as heat, faeces and not all food is eaten
What makes plants bend?
Plants bend towards light
Gibberellin
A plant growth hormone which stimulates seed germination, stem growth and flowering, makes them grow tall
Auxin
A plant hormone that controls growth at the tips of shoots and roots
