Exam 28: Plants in the Environment

Which statement about aerenchyma tissue is false?

During freezing weather,a plant that lacks antifreeze proteins is likely to experience all of these conditions except

The characteristic defining a plant chemical as a secondary metabolite is that the chemical

Which type of environment is typical for an annual plant with a brief growing period and seeds capable of long dormant periods?

Fungi can directly enter and infect plant cells.Production of which type of molecule would likely be most effective at preventing fungi from entering the cells or from spreading to other cells?

An abundance of alpine pennycress growing in a field would suggest that the region is subject to

Which substance is produced in specific immunity but not in general immunity?

Some soybeans are susceptible to a disease called bacterial blight.A plant geneticist wants to genetically engineer a soybean that is resistant to this disease and needs to find a gene to splice into the plant.The scientist would most likely look for

A scientist is testing a variety of plant compounds to determine which,if any,have characteristics that would make them good natural insecticides.Which compound would best meet this requirement?

Which biochemical aspects of plants and their cells are quickly compromised as a result of excessive drought?

Which of the following represents the correct chronological ordering of the events in the signaling pathway against herbivory?

A plant's first line of defense against pathogens is its

Genetically engineering tobacco plants to increase their nicotine concentration would most likely result in plants with

An RNA virus attack on a plant triggers the production of siRNA.These siRNAs are derived from the RNA of the _______ and cause the plant to _______.

Which response to high temperatures is most analogous to the cold-hardening response to low temperatures?

To initiate an induced immune response to herbivory,a plant must first sense the herbivore's attack.It does this when the herbivore's attack causes either

Upon sensing the presence of a pathogen,a plant begins synthesizing chemicals to defend against it.This response is known as a(n)

A gene in a petunia plant produces an integral membrane protein that is involved in helping the petunia resist pathogens.This gene probably codes for a

Several plants,including the castor oil plant,defend themselves against herbivory by producing highly toxic water-soluble proteins called ricins.Proricin,consisting of A and B chains,is stored in vacuoles called protein bodies.It becomes active when an enzyme inside the protein body cleaves the A and B chains.This suggests that the castor oil plant is able to avoid self-poisoning by

Which substance is upregulated in plants experiencing either drought stress or cold-hardening?