New version page

SC BIOL 425 - plant 3-1

This preview shows page 1 out of 2 pages.

View Full Document
View Full Document

End of preview. Want to read all 2 pages?

Upload your study docs or become a GradeBuddy member to access this document.

View Full Document
Unformatted text preview:

Test 3 Review- In the eudicot stem, the phloem differentiates towards the outside and the xylem differentiates toward the center- Cambial fusiform initials produce: xylem and phloem- In most woody plants, the first periderm usually arises in the cortex- In a woody root one meter in diameter, the epidermis will not be present- In angiosperms, the early wood has wider pores (vessel elements) than the late wood.- When transpiration starts in the morning, the xylem sap of a tree begins to flow first in the small twigs- Water loss is the most important factor affecting stomatal closing- Transpiration is the loss of water vapor from plant leaves- Statement not consistent with the cohesion-tension theory: positive root pressure is essential to the movement of water from roots to leaves- The driving force for assimilate transport is osmosis generating pressure gradients between source and sink sites- ABA is produced in response to water limitation in the soil- Auxin is transported toward the base in stems, toward the base in leaves, and toward the tip then back in roots- Indoleacetic acid is very similar to the amino acid tryptophan- Auxin is used to selectively kill monocot grasses- If the coleoptile tip is covered with a blackened glass tube then illuminated from the side,the coleoptile will not bend- In apical dominance, the auxin gradient released from the vegetative apical bud inhibits the growth of lateral buds- Kinetin was obtained as an artifact by autoclaving DNA- Cytokinins are synthesized in the roots and transported from there to all other parts of the plant by the xylem- Synthesis of ethylene does NOT begin with the amino acid tryptophan- Jasmonates are recently discovered fatty acid derivatives that activate chemical defenses against herbivores- the conversion from sugars to starches is NOT associated with fruit ripening- abscisic acid does NOT inhibit embryogenesis- bolting is the process of stem elongation and flowering induction in cabbage and carrots- cell wall extensibility or cell expansion is increased by auxin and ethylene- a finding from experiments on the role of auxin in the phototropism of coleoptile tips is that light does not affect the total amount of auxin- red light is the most effective in lettuce seed germination- according to the original hypothesis of negative gravitopism of shoots, auxin is distributed to the lower side where it stimulates cell expansion- when a growing root is oriented horizontally, the amyloplasts in the central column of therootcap slide (sediment) downward- circadian rhythms have cycles of approximately 24 hours- if a short day plant receives a short light exposure in the middle of the dark period interrupting the continuous darkness it will not flower- long day plants can be induced to flower if the night period is interrupted by light- when lettuce seeds are exposed to far red light Pfr is converted to Pt; no germination- an etiolated eudicot seedling has an elongated stem and small yellow leaves- when the tip of a germinating seedling emerges from the soil in light, the plant undergoes a set of changes in growth and development called photomorphogenic responses- in roots statoliths are localized in the Columella cells of the rootcap- stratification is the process used by horticulturalists in which seeds are moistened and exposed to low temperatures- in the process of vernalization, flowering is stimulated by exposing the germinating winter rye seeds and young plants to low temperatures- in nyctinastic movements many legume leaves are oriented vertically in darkness and horizontally in light- in contrast to thigmonastic movements thimomorphogenesis involves an altered (retarded) growth pattern in response to frequent touching- potassium is not a micronutrient- clay is the soil particle with the smallest diameter- clay can hold the largest amount of water against the action of gravity- cation exchange capacity of soil particles (negative surface charge) is important because the exchangeable ions are not lost with leaching water and remain available for the plants- the chief reservoir of nitrogen is the atmosphere - the final product of denitrification is N2- rhizobia enter legumes by invading the root hairs- nitrate is the main form of nitrogen available to crop plants in the soil- mycorrhizae are especially important in the plants absorption of water and phosphorus- the primary source of phosphorus is weathering rocks and decomposition in the soil- according to the pressure flow model the uploaded sugar moves by the movement of phloem sap driven by the pressure gradient formed between the active leaf sieve cells andsieve elements and that of the other tissues of the same plant- blue light is the most effective in producing a phototropic response- hardwood is the name given to wood found in eudicots and magnolids- a dormant seed will germinate only when precise environmental cues are


View Full Document
Loading Unlocking...
Login

Join to view plant 3-1 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view plant 3-1 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?