Question 1

Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential.ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells.What effect would this have on the stomata and the process of transpiration?

Accepted Answer

ABA causes stomata to close, reducing water loss and decreasing the rate of transpiration.

Question 2

Climbing plants, such as vines, rely on touch to navigate and develop tendrils that coil around objects they encounter.Roots also rely on touch to navigate their way through the soil.When roots come into contact with an object, they generally grow in a direction away from the object.Based on this information, which of the following statements is true?

Accepted Answer

Tendrils exhibit a positive thigmotropic response by coiling around objects, while roots exhibit a negative thigmotropic response by growing away from objects.

Question 3

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?

Accepted Answer

Cytokinin works synergistically with auxin to promote cell division and differentiation in plant tissues, which can enhance crop productivity.

Question 4

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

Accepted Answer

Hormones are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

Question 5

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

Accepted Answer

Mature plants may become dormant in dry or cold seasons to conserve energy and resources, allowing them to survive until favorable conditions return.

Question 6

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.

Accepted Answer

Pulvini are specialized structures at the base of a leaf or leaflet that facilitate rapid turgor pressure changes, enabling movement in response to stimuli such as touch or light.

Question 7

One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their

Accepted Answer

Auxin increases the plasticity of cell walls, allowing them to stretch and elongate, which is essential for cell growth.

Question 8

Charles Darwin and his son experimented with which plant growth response?

Accepted Answer

Charles Darwin and his son Francis conducted experiments on phototropism, which is the growth response of plants to light. They studied how plants bend towards light, leading to the discovery of the role of the tip of the plant in sensing light.

Question 9

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?

Accepted Answer

Ethylene is a plant hormone that is commonly used in agriculture to promote the ripening of fruits. The advertisement refers to a system for distributing this hormone to facilitate large-scale ripening.

Question 10

________________ is directional growth responses of plants to a unidirectional source of light.

Accepted Answer

Phototropism is the growth response of plants towards or away from a light source.

Question 11

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

Accepted Answer

The answer of The plant hormones known as ___________ may...

Question 12

The elongation of stems is stimulated by

Accepted Answer

Both auxin and gibberellin are plant hormones that stimulate the elongation of stems.

Question 13

Which cell structure is most likely responsible for sensing gravity?

Accepted Answer

Amyloplasts are specialized organelles in plant cells that are involved in the perception of gravity, as they can sediment in response to gravitational pull, helping the plant orient its growth.

Question 14

While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:

Accepted Answer

Ethylene is a plant hormone known to promote fruit ripening, and wounding can stimulate its production.

Question 15

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

Accepted Answer

Heat shock proteins are produced in response to sudden increases in temperature to help stabilize and refold denatured proteins.

Question 16

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

Accepted Answer

Covering the tip of the seedling with metal foil prevented it from detecting light, so it did not bend toward the light source.

Question 17

A plant sustains pathogen-induced damage to one of its cell walls.A gene-for-gene response soon follows and the tissue surrounding the injury soon dies.Which signaling molecules facilitated this response?

Accepted Answer

Oligosaccharins are signaling molecules that play a role in plant defense responses, including the gene-for-gene response, which involves the recognition of pathogen-derived molecules and leads to localized cell death to prevent the spread of the pathogen.

Question 18

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

Accepted Answer

Auxin is a plant hormone that promotes fruit growth and development. The removal of seeds, which are a source of auxin, stops fruit growth, indicating the role of auxin in this process.

Question 19

Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains

Accepted Answer

Coconut milk contains cytokinins, which are plant hormones that promote cell division and growth, making it beneficial for plant tissue culture.

Question 20

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme $\alpha$-amylase.Which food source are gibberellins targeting with the release of $\alpha$-amylase?

Accepted Answer

Gibberellins induce the synthesis of the enzyme F1F1F1S1F1F1F10-amylase, which hydrolyzes starch into glucose.

Quiz 40: Sensory Systems in Plants

Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential.ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells.What effect would this have on the stomata and the process of transpiration?

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?

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

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

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.

One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their

Charles Darwin and his son experimented with which plant growth response?

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?

________________ is directional growth responses of plants to a unidirectional source of light.

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

The elongation of stems is stimulated by

Which cell structure is most likely responsible for sensing gravity?

While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:

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

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

A plant sustains pathogen-induced damage to one of its cell walls.A gene-for-gene response soon follows and the tissue surrounding the injury soon dies.Which signaling molecules facilitated this response?

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

Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme $\alpha$ -amylase.Which food source are gibberellins targeting with the release of $\alpha$ -amylase?

Quiz 40: Sensory Systems in Plants

Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential.ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells.What effect would this have on the stomata and the process of transpiration?

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?

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

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

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.

One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their

Charles Darwin and his son experimented with which plant growth response?

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?

________________ is directional growth responses of plants to a unidirectional source of light.

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

The elongation of stems is stimulated by

Which cell structure is most likely responsible for sensing gravity?

While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:

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

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

A plant sustains pathogen-induced damage to one of its cell walls.A gene-for-gene response soon follows and the tissue surrounding the injury soon dies.Which signaling molecules facilitated this response?

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

Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme α\alphaα -amylase.Which food source are gibberellins targeting with the release of α\alphaα -amylase?

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme $\alpha$ -amylase.Which food source are gibberellins targeting with the release of $\alpha$ -amylase?