Exam 38: Plant Responses to Environmental Challenges

A rust fungus (Melampsora lini) causes disease in some varieties of the flax plant (Linum usitatissimum).In other varieties of the same flax plant, the rust has no effect.Explain this paradox.

Hyperaccumulated metals are most likely to be stored in

A seed that is accumulating proteins that are essential for drought resistance is most likely accumulating _______ proteins.

What is the role of the phytoalexins produced as part of the response to a pathogen?

The ability of plants to employ resistance genes to counter specific pathogen Avr genes is called

A farmer who wishes to turn on plant defenses against herbivores is most likely to spray a crop with _______ acid.

Laticifers are

Which condition stimulates the production of heat shock proteins?

Plants can be treated with _______ to stimulate the production of pathogenesis-related proteins.

In cacti, photosynthesis is carried out in the _______.

The toxic substance that most restricts plant growth is _______; this substance is found in a diverse array of habitats, including poorly managed agricultural land.

The main function of heat shock proteins is to

The fatty acid derivative jasmonate is a

Milkweed plants defend themselves from damage by most herbivorous insects with latex, which is stored in specialized tubes called _______.

Which adaptation in xerophytes is not a direct response to the environment?

Many induced plant defenses are triggered by infection or herbivory.But plants also have _______ defenses already in place before such damage occurs.

After being attacked by a smut fungus, a group of corn plants becomes more resistant to further attack.These plants now have

If a nonhalophyte and a halophyte are both placed in a salty environment, the _______ will accumulate more sodium internally, because _______.

Refer to the figure. Explain the presence of white residue on the leaves of this halophyte plant.

A plant in a nursery survives repeated cold nights.At the end of several weeks of this weather, this plant can be described as