Exam 36: Regulation of Plant Growth

A red-light photoreceptor in plants is called

A botanist is studying a newly discovered plant that is native to Norway.Which of the following would be the earliest indication that gibberellins play the same role in this plant that they play in flowering and reproduction in cabbage?

Refer to the figure below, illustrating early studies of phototropism. After blindfolding different parts of the seedling and watching the response to a light stimulus, the Darwins concluded that

The action of the plant hormones auxin and gibberellin

Application of _______ to leaves can keep them green and delay senescence.

Refer to the diagram below showing cereal grain germination. Wheat grains are processed to produce flour before germination occurs.Which part of the seed is used to mill white flour (which is mostly starch)?

Which compound is not a major group of plant hormones?

A plant part (such as a root) that responds to gravity by growing downward is said to be _______.

Auxin produced by mature leaves prevents the death of cells in the _______ at the base of the petiole.

A type of seedless fruit commonly produced using artificially applied gibberellins is _______.

It is thought that auxins control growth by cell _______.

Refer to the diagram below showing cereal grain germination. Identify the molecules indicated by F in seed 4.What is their role in relation to structure C?

Researchers used a genetic screen to identify a blue-light-insensitive mutant Arabidopsis plant strain, then identified the gene for a blue-light receptor protein.Name the photoreceptor involved, and explain its role in plant behavior.

In an experiment for this course, you are told to remove the shoot apical meristem of a sunflower, and you see that this leads to outgrowth of branch shoots.In order to reestablish apical dominance you would then apply _______.

When germinating grass seeds are stimulated by gibberellins, the stimulation specifically increases enzyme production by the

A scientist is studying seeds from a species of sundew native to Western Australia.These seeds need to be treated with smoke before they can imbibe and germinate.This suggests that _______ for the seeds to germinate.

Each cocklebur fruit contains two seeds that are kept dormant by two different mechanisms.Why might having two mechanisms of dormancy be advantageous to cockleburs?

Refer to the figure below. The leaf on the left is turning yellow because it is experiencing a natural process known as

Describe the circumstances under which it would be advantageous for a species to have the dormancy of its seeds broken by fire.

Molecules that are active at small concentrations and regulate plant development are called _______.