Exam 36: Regulation of Plant Growth

Refer to the figure below showing the changes that occur when a leaf is about to fall from the stem. In this diagram, an abscission zone has formed.What does that mean for the plant?

A scientist discovers a new chemical, based on the amino acid serine, which causes plants to produce extra leaves when applied to them exogenously.The paper that is published about this work should indicate that this is probably a new class of plant

The _______ transport of auxin establishes the orientation of growth and the _______ redistribution of auxin causes a growth response to a light that is called _______.

Which answer choice is not an adaptive advantage of seed dormancy?

You treat a bean plant with cytokinins.What will be the result?

Daylight has a high ratio of red to far-red light.As a result, red light activation of the phytochrome into the P_fr state leads to which of the following events?

Cytokinins

If you wanted to alter the early development of pea plants, which of the following would not be useful to change or manipulate?

_______ involves lack of germination because seeds do not receive the conditions needed for growth.

The increasing popularity of small home vegetable gardens over the last century has increased the need for smaller, dwarf cultivars of various vegetables such as peas and tomatoes.In general, these dwarfs produce less _______ than their wild-type counterparts.

In observing the growth and development of a plant, you notice that changes occur with respect to which parts of the plants grow or receive resources over time.This is called

Which of the following represents the correct order of events in ethylene signal transduction?

Plant hormones interact with _______, which are usually proteins.

Refer to the figure below. This experiment showed that a chemical signal (later identified as the hormone _______) was able to travel from the shoot tip to the part of the plant that responds by causing the cells opposite the light to elongate compared to the rest of the cells in the shoot.

Which of the following does not absorb blue light?

Ethylene and auxin work together in eudicot seedlings to promote formation of an apical _______, which protects the stem while it grows through the soil.

It was discovered recently that both auxin and gibberellins have specific protein receptors that, when bound by hormones,

Auxin polar transport goes

Refer to the figure below.Each photograph shows a dwarf plant with a hormonal deficiency and a normal-sized plant of the same species. Differential action of which two hormones might explain the differing plant sizes in the images?

If you were conducting a study to determine how seeds from various habitats break dormancy, which of the following would be the least useful experimental variable?