Which of the following is most likely NOT an example of a plant defense to herbivory?       Lignin in the tissues

Which plant hormone is known as germination inhibitor?     gibberellin   ethylene   abscisic acid   auxin

Hormones and signal pathways Complete the following paragraph to describe signal transduction as it occurs within plants. Choices may be used more than once or not at all. Chemical signals called play an important role in a plant's ability to respond to a stimulus. These signals bind to receptors, the first step in a cellular response called a may be located in the plasma membrane, the cytoplasm, the nucleus, or the endoplasmic reticulum. The series of relay proteins or enzymes activated by the hormone binding the receptor make up the Some responses are immediate, while others require a like Ca*, to initiate a cellular response. The result of the transduction pathway is a which is often the transcription of specific genes, resulting in some measurable change. hormones reflex arc signal transduction pathway Signal transducers second messenger response Receptor proteins first messenger

Which of the following is true of pine pollen/pollination? The male gametophyte is the fully developed seed Many pollen grains have "air bladders" Pines are wind pollinated Pollen grains are composed of one cell