Exam 40: Sensory Systems in Plants

The plant hormones known as ___________ may have an evolutionary origin in the common ancestor to both plants and animals.

When seeds are removed from strawberries, fruit growth is stopped.This suggests the seeds contain which of the following hormones?

When gibberellin binds to its receptor, what happens to activate the gibberellin-dependent transcription factor GA-TRXN?

Which cell structure is most likely responsible for sensing gravity?

While flipping through an agriculture products catalog, you come across the following advertisment, "The Centralized Ripening System-makes large scale hormone distribution even easier!".What hormone does this product distribute?

Abscisic acid synthesized in the root travels to different parts of the shoot where it regulates transpirational water loss.What is the most likely way that ABA travels from the root to the various locations within the shoot?

While researching the effects of light on chlorophyll synthesis in sorghum, you find that brief pulses of red light stimulates the synthesis of chlorophyll and This would suggest that chlorophyll synthesis is directed by the P_r form of phytochrome.

What happens when coleoptiles are illuminated with directional light from the side instead of from directly overhead?

When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side, what happened to the seedling?

Directional, light-triggered plant development is known as

Several scientists, including Charles and Francis Darwin, Frits Went and others, demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments.Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?

While touring a farm, the farmer tells you that she uses cytokinin to increase crop productivity.But, from biology class you know that cytokinin alone has no effect on parenchyma cells.What other substance is the farmer most likely using in conjunction with cytokinin?

Which of the following describe a role that ethylene plays in plant physiology.Check all that apply.__X__ Retarding stem and root elongation.__X__ Hastening the ripening of fruit._____ Inhibition of leaf abscission.__X__ Inhibition of lateral bud growth.__X__ Accelerates the loss of damaged fruits.

Plants maintain higher levels of phytochrome at their growing tips where phytochrome plays important roles in growth responses to light.Phytochrome levels are also high in areas of the plant that are "greening".What does this suggest about the role of phytochrome in these "greening" zones?

Research has shown that cytokinin levels fluctuate seasonally in temperate plants.What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?

The removal of the root cap eliminates the ability of a root to respond to gravity.

If temperatures suddenly rise 5 to 10º C, __________ proteins are produced to help stabilize other proteins.

Mature plants may become __________ in dry or cold seasons in order to survive long periods that are unfavorable for growth.

A plant physiologist treats a leaf with abscisic acid and observes that the stomata close.What happened inside the guard cells during the experiment?

The directional growth response of plants to touch is called