Exam 37: Plant Signals and Responses to the Environment

The plant hormone ____ appears to play a major role in gravitropism in roots and shoots.

The plant signaling molecule ____ is similar in structure to aspirin.

Molecular data has shown that ____ originated during the period when non-bryophytes diverged from the bryophytes.

The plant hormone synthesized mainly in root tips and apparently transported through the plant in xylem sap is ____.

When a plant becomes infected by pathogenic bacteria or fungi, it may respond by way of a fight or flight response - a defense that cordons off an infection site surrounding it with dead cells.

Where is the auxin receptor ABP1 located in plant cells?

Suppose you are culturing tobacco callus in a Petri dish at a 10:1 ratio of auxin to cytokinin. To promote only shoot development you would ____.

The type of plant hormone primarily responsible for inhibiting growth of lateral meristems on shoots and restricting the formation of branches is/are ____.

A plant's response to the relative lengths of light and dark periods in its environment during each 24-hour period is a phenomenon called ____.

Work by Charles Darwin and Francis Darwin was instrumental in the discovery of ____.

The most important natural auxin is ____ acid.

The plant hormone ____ is apparently synthesized from carotenoid pigments inside plastids.

Commercial grape growers use ____ to get larger grapes by lengthening the stem on which fruits develop.

According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then activates ____ that disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.

When a plant has a hypersensitive response, production of ____ triggers effects such as the expression of PR proteins.

In some cases, when an insect begins feeding on a leaf the plant responds by activating a signaling pathway that results in the production of ____, which disrupt an insect's capacity to digest proteins.

Placing a ripe apple with other apples that are not ripe will cause the other apples to ripen sooner due to the release of ____.

The type of plant hormone primarily responsible for promoting the formation of lateral roots is/are ____.

In systemic acquired resistance, the regulatory protein NPR-1 moves from the cytoplasm to the cell nucleus, apparently in response to a buildup of ____ in the cytoplasm.

Flowering in Arabidopsis appears to require ____.