Show:
Discovery of Plant Hormone
Auxins and Cytokinins
gibberellins and abscisic acid
Ethylene
100
What are the chemical messengers in plants called?
Plant hormones
100
What are Auxins?
Plant hormones that promote plant growth
100
What are gibberellins?
Plant hormones that stimulate the growth of stems by promoting both cell division and cell elongation.
100
What is ethylene?
Plant hormone that is naturally occurring that stimulates fruit ripening.
200
When the tips of the seedlings are cut off, do the shoots continue to grow straight up or towards the light?
They grow straight up
200
What does Auxin mean?
Its a greek word auxein meaning "to increase"
200
What is abscisic acid?
Plant hormones that inhibits cell division in buds and in the vascular cambium.
200
What is leaf drop?
The loss of leaves from deciduous trees every autumn.
300
Who conducted some of the first experiments to answered the question of how plants grow towards light?
Charles Darwin and his son Francis
300
What are cytokinins?
Plant hormones that stimulate cell division
300
True or False. The abscisic acid works the same way as gibberellins.
False. They are the exact opposite.
300
True or False. Leaf drop is an adaptation that helps keep trees from drying out in the winter?
True
400
What was the Darwins' hypothesis?
Darwins hypothesized that a shoot tip detects light and transmits a signal down to the growing region of the shoot.
400
Where are cytokinins produced?
They are produced in actively growing tissues, particularly in embryos, roots and fruits
400
What does ABA stand for?
abscisic acid
400
True or False. Tree roots can take up water from the frozen ground during winter.
False
500
What do plant hormones control?
Plant hormones control a plant's germination from a seed, growth, flowering, and fruit production
500
What are the effects of cytokinins?
Slows the aging of flowers and fruits
500
True or False. ABA halts primary and secondary growth.
True
500
True or False. Is ethylene a gas that is released when kerosene is burned?
True