Concentric rings found in the wood of the trees are known as:
a. summer rings.
b. spring rings.
c. annual rings.
d. dendrochrons.
e. pith rings.
C
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Answer the following statements true (T) or false (F)
1. The plant hypersensitive response is one in which the plant is unable to defend itself against a pathogen. 2. Generally plants are unable to produce chemicals that travel throughout the plant to protect against pathogens; most defense is only in localized areas. 3. When scientists breed for genes for resistance to pathogens or herbivores they are usually limited to making mutations for this to happen. 4. Cytokinins are transported through the xylem to meristems where they aid in cell elongation.
Which of the following mutant alleles is most likely to be dominant to the wild-type allele?
A) a silent mutation B) a premature stop codon that results in a partial loss of protein function C) a missense mutation that increases enzyme activity D) a promoter mutation that reduces gene transcription
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What will be an ideal response?
Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.
A. physiological breakdown of the chemical into harmless products B. transport of toxins absorbed by the roots into the shoots, where they can be collected more easily C. root pressure pushing toxins from deep in the soil towards the surface D. secretion of a substance from the roots that breaks down the toxic chemical E. "storage" of a toxic chemical in plant tissues, which are then removed from the site